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Posted to user@geronimo.apache.org by Phani Madgula <ph...@gmail.com> on 2008/05/07 07:22:45 UTC
JPA Problem
Hi,
I have an EJB application using JPA and a web application looking up ejbs in
EJB application. I am able to deploy both the applications on AG2.1 server.
But when I hit the servlet, I get the following error in the console.
*****
Message: The bean encountered a non-application exception.; nested exception
is:
<openjpa-1.0.1-r420667:592145 fatal user error>
org.apache.openjpa.persi
stence.ArgumentException: Could not locate metadata for the class using
alias "A
ccount". This could mean that the OpenJPA enhancer or load-time weaver was
not r
un on the type whose alias is "Account". Registered alias mappings:
"{Account=nu
ll}"
*****
The ejb app is attached to mail. Any suggestions on what is missing here??
Thanks
Phani
Re: JPA Problem
Posted by Phani Madgula <ph...@gmail.com>.
Thanks Jay.
I added setters & getters and now the "deposit()" is working fine. You may
bring this up with OpenJPA forum. I will also join and add the comments.
Thanks again for help.
--Phani
On Fri, May 9, 2008 at 2:49 AM, Jay D. McHugh <ja...@gmail.com> wrote:
> Hello Phani,
>
> It looks like you are correct about not needing to specify container
> managed persistence. It is the default.
>
> After lots of playing with your Account and BankBean classes, it looks like
> OpenJPA is fine with having your annotations (in Account.java) on the fields
> (field access). But it doesn't seem to be detecting when the fields are
> directly changed.
>
> So the quick way to get things working is to set up getters and setters on
> your entity class and use those for altering your entities (basically switch
> to using property access).
>
> I have never used field access in OpenJPA, so I don't know if you are
> supposed to need to use setters.
>
> This is probably something that should be brought up on the OpenJPA lists.
>
> Do you want to, or should I?
>
>
> Jay
>
> Phani Madgula wrote:
>
>> Hi Jay,
>> I have not explicitly declared transaction configuration. So, the server
>> should run the the method with "TxRequired". The same info has been logged
>> to geronimo.log.
>>
>> I am attaching the apps 1) EJB app 2) WEB app to test ejb app. You may
>> have
>> a look at the apps. The following are the steps to recreate the problem.
>>
>> 1. Create BankDB database in the embedded derby db server using DB manager
>> portlet.
>> 2. Create Account table using "create table account (accountnumber
>> integer,
>> ownername varchar(50), balance integer, version integer)"
>> 3. Deploy the EJB app
>> 4. Deploy the WEB app
>> 5. Hit the URL in browser window -->
>> http://localhost:8080/AccountCreateWEB/Test?accNo=1
>>
>> We could see that servlet is calling deposit(accountnumber ,100) method
>> but
>> the value is not being updated in the database.
>>
>> Thanks
>> Phani
>>
>> On Wed, May 7, 2008 at 2:56 PM, Jay D. McHugh <ja...@gmail.com>
>> wrote:
>>
>> Phani,
>>>
>>> Are you specifying that you want to use container managed persistence in
>>> your BankBean?
>>>
>>> The way to do this with an annotation would be:
>>> @TransactionManagement(TransactionManagementType.CONTAINER)
>>>
>>> If you are specifying container managed persistence then you wouldn't
>>> need
>>> to worry about starting and committing your transaction - and the code
>>> for
>>> your 'deposit' method would work. Actually, you don't even need the
>>> 'manager.merge(account)'.
>>>
>>> But, if you are not specifying container managed persistence - then you
>>> need to get a UserTransaction and begin/commit it to have your account
>>> balance change in your database.
>>>
>>> Hope that helps,
>>>
>>> Jay
>>>
>>>
>>> Phani Madgula wrote:
>>>
>>> Hi,
>>>>
>>>> I got past the above error but experiencing some strange results as
>>>> follows.
>>>>
>>>> In the BankBean.java, I have the following method.
>>>>
>>>> *********
>>>> public void deposit(int accountNumber, int amount) {
>>>> Account account = manager.find(Account.class, accountNumber);
>>>> account.balance += amount;
>>>> System.out.println("New balance="+account.balance);
>>>> System.out.println("Merging the account");
>>>> manager.merge(account);
>>>> }
>>>> *********
>>>>
>>>> I have the Account.java as follows.
>>>> **********************************************************************
>>>> package sample.jpa;
>>>>
>>>> import java.io.Serializable;
>>>>
>>>> import javax.persistence.Entity;
>>>> import javax.persistence.Id;
>>>> import javax.persistence.NamedQuery;
>>>> import javax.persistence.PostLoad;
>>>> import javax.persistence.PostUpdate;
>>>> import javax.persistence.PrePersist;
>>>> import javax.persistence.PreUpdate;
>>>> import javax.persistence.Version;
>>>> import javax.persistence.Table;
>>>>
>>>> /**
>>>> * This demo entity represents a Bank Account.
>>>> * <p>
>>>> * The entity is not a remote object and can only be accessed locally by
>>>> * clients. However, it is made serializable so that instances can be
>>>> passed
>>>> by
>>>> * value to remote clients for local inspection.
>>>> * <p>
>>>> * Access to persistent state is by direct field access.
>>>> */
>>>> @Entity
>>>> @Table(name = "ACCOUNT")
>>>> @NamedQuery(name="findThem", query="SELECT a FROM Account a")
>>>> public class Account implements Serializable {
>>>>
>>>> /** The account number is the primary key for the persistent object
>>>> */
>>>> @Id
>>>> public int accountNumber;
>>>>
>>>> public String ownerName;
>>>>
>>>> public int balance;
>>>>
>>>> @Version
>>>> public int version;
>>>>
>>>> /**
>>>> * Entity beans must have a public no-arg constructor
>>>> */
>>>> public Account() {
>>>> // our own primary key generation, workaround for the
>>>> // time being as persistence does not support
>>>> // auto-generation
>>>> accountNumber = (int) System.nanoTime();
>>>> }
>>>>
>>>> public String toString() {
>>>> return "Acc.# " + accountNumber + ", owner" + ownerName + ",
>>>> balance: " + balance
>>>> + " $";
>>>> }
>>>>
>>>> @PrePersist
>>>> void prepersist() {
>>>> System.out.println("pre persist!!");
>>>> }
>>>>
>>>> @PreUpdate
>>>> void preupdate() {
>>>> System.out.println("pre update!!");
>>>> }
>>>>
>>>> @PostUpdate
>>>> void postupdate() {
>>>> System.out.println("post update!!");
>>>> }
>>>>
>>>> @PostLoad
>>>> void postload() {
>>>> System.out.println("post load!!");
>>>> }
>>>>
>>>> }
>>>> **********************************************************************
>>>>
>>>> In the servlet I have the following code
>>>>
>>>> **********************************************************************
>>>>
>>>> bank = (Bank)ctx.lookup("BankBeanRemote");
>>>> account =
>>>> bank.findAccount(Integer.parseInt(request.getParameter("accNo")));
>>>>
>>>> out.println("account Number =
>>>> "+account.accountNumber+"<br/>");
>>>> out.println("ownerName = "+account.ownerName+"<br/>");
>>>> out.println("balance = "+account.balance+"<br/>");
>>>> out.println("version = "+account.version+"<br/>");
>>>>
>>>>
>>>> accountNumber = account.accountNumber;
>>>>
>>>> out.println("Depositing Rs.100"+"<br/>");
>>>>
>>>> bank.deposit(accountNumber,100);
>>>>
>>>> **********************************************************************
>>>>
>>>> When I run the servlet, it is able to load the account values from the
>>>> "account =
>>>> bank.findAccount(Integer.parseInt(request.getParameter("accNo")));"
>>>> statement. However, the "bank.deposit(accountNumber,100);" is not
>>>> updating
>>>> the "balance" field.
>>>>
>>>> What is the problem?? I have the following persistence.xml file
>>>>
>>>>
>>>> *****************************************************************************************************
>>>> <?xml version="1.0" encoding="UTF-8"?>
>>>> <persistence xmlns="http://java.sun.com/xml/ns/persistence"
>>>> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
>>>> version="1.0"
>>>> xsi:schemaLocation="
>>>> http://java.sun.com/xml/ns/persistence
>>>> http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd">
>>>> <persistence-unit name="BankPU">
>>>> <description>Bank example</description>
>>>>
>>>>
>>>>
>>>> <provider>org.apache.openjpa.persistence.PersistenceProviderImpl</provider>
>>>> <class>sample.jpa.Account</class>
>>>> <properties>
>>>> <property name="openjpa.ConnectionURL"
>>>> value="jdbc:derby:BankDB"
>>>> />
>>>> <property name="openjpa.ConnectionDriverName"
>>>> value="org.apache.derby.jdbc.EmbeddedDriver" />
>>>> <property name="ConnectionUserName" value="app" />
>>>> <property name="openjpa.jdbc.SynchronizeMappings"
>>>> value="false"
>>>> />
>>>> </properties>
>>>> </persistence-unit>
>>>> <!--
>>>> <jta-data-source>PhoneBookPool</jta-data-source>
>>>> <non-jta-data-source>PhoneBookPool</non-jta-data-source>
>>>> -->
>>>> </persistence>
>>>>
>>>>
>>>>
>>>> **********************************************************************************************************
>>>>
>>>> On Wed, May 7, 2008 at 10:52 AM, Phani Madgula <
>>>> phanibalaji.madgula@gmail.com> wrote:
>>>>
>>>> Hi,
>>>>
>>>>> I have an EJB application using JPA and a web application looking up
>>>>> ejbs
>>>>> in EJB application. I am able to deploy both the applications on AG2.1
>>>>> server. But when I hit the servlet, I get the following error in the
>>>>> console.
>>>>> *****
>>>>> Message: The bean encountered a non-application exception.; nested
>>>>> exception is:
>>>>>
>>>>> <openjpa-1.0.1-r420667:592145 fatal user error>
>>>>> org.apache.openjpa.persi
>>>>> stence.ArgumentException: Could not locate metadata for the class
>>>>> using
>>>>> alias "A
>>>>> ccount". This could mean that the OpenJPA enhancer or load-time weaver
>>>>> was
>>>>> not r
>>>>> un on the type whose alias is "Account". Registered alias mappings:
>>>>> "{Account=nu
>>>>> ll}"
>>>>> *****
>>>>>
>>>>> The ejb app is attached to mail. Any suggestions on what is missing
>>>>> here??
>>>>>
>>>>> Thanks
>>>>> Phani
>>>>>
>>>>>
>>>>>
>>
Re: JPA Problem
Posted by "Jay D. McHugh" <ja...@gmail.com>.
Hello Phani,
It looks like you are correct about not needing to specify container
managed persistence. It is the default.
After lots of playing with your Account and BankBean classes, it looks
like OpenJPA is fine with having your annotations (in Account.java) on
the fields (field access). But it doesn't seem to be detecting when the
fields are directly changed.
So the quick way to get things working is to set up getters and setters
on your entity class and use those for altering your entities (basically
switch to using property access).
I have never used field access in OpenJPA, so I don't know if you are
supposed to need to use setters.
This is probably something that should be brought up on the OpenJPA lists.
Do you want to, or should I?
Jay
Phani Madgula wrote:
> Hi Jay,
> I have not explicitly declared transaction configuration. So, the server
> should run the the method with "TxRequired". The same info has been logged
> to geronimo.log.
>
> I am attaching the apps 1) EJB app 2) WEB app to test ejb app. You may have
> a look at the apps. The following are the steps to recreate the problem.
>
> 1. Create BankDB database in the embedded derby db server using DB manager
> portlet.
> 2. Create Account table using "create table account (accountnumber integer,
> ownername varchar(50), balance integer, version integer)"
> 3. Deploy the EJB app
> 4. Deploy the WEB app
> 5. Hit the URL in browser window -->
> http://localhost:8080/AccountCreateWEB/Test?accNo=1
>
> We could see that servlet is calling deposit(accountnumber ,100) method but
> the value is not being updated in the database.
>
> Thanks
> Phani
>
> On Wed, May 7, 2008 at 2:56 PM, Jay D. McHugh <ja...@gmail.com> wrote:
>
>> Phani,
>>
>> Are you specifying that you want to use container managed persistence in
>> your BankBean?
>>
>> The way to do this with an annotation would be:
>> @TransactionManagement(TransactionManagementType.CONTAINER)
>>
>> If you are specifying container managed persistence then you wouldn't need
>> to worry about starting and committing your transaction - and the code for
>> your 'deposit' method would work. Actually, you don't even need the
>> 'manager.merge(account)'.
>>
>> But, if you are not specifying container managed persistence - then you
>> need to get a UserTransaction and begin/commit it to have your account
>> balance change in your database.
>>
>> Hope that helps,
>>
>> Jay
>>
>>
>> Phani Madgula wrote:
>>
>>> Hi,
>>>
>>> I got past the above error but experiencing some strange results as
>>> follows.
>>>
>>> In the BankBean.java, I have the following method.
>>>
>>> *********
>>> public void deposit(int accountNumber, int amount) {
>>> Account account = manager.find(Account.class, accountNumber);
>>> account.balance += amount;
>>> System.out.println("New balance="+account.balance);
>>> System.out.println("Merging the account");
>>> manager.merge(account);
>>> }
>>> *********
>>>
>>> I have the Account.java as follows.
>>> **********************************************************************
>>> package sample.jpa;
>>>
>>> import java.io.Serializable;
>>>
>>> import javax.persistence.Entity;
>>> import javax.persistence.Id;
>>> import javax.persistence.NamedQuery;
>>> import javax.persistence.PostLoad;
>>> import javax.persistence.PostUpdate;
>>> import javax.persistence.PrePersist;
>>> import javax.persistence.PreUpdate;
>>> import javax.persistence.Version;
>>> import javax.persistence.Table;
>>>
>>> /**
>>> * This demo entity represents a Bank Account.
>>> * <p>
>>> * The entity is not a remote object and can only be accessed locally by
>>> * clients. However, it is made serializable so that instances can be
>>> passed
>>> by
>>> * value to remote clients for local inspection.
>>> * <p>
>>> * Access to persistent state is by direct field access.
>>> */
>>> @Entity
>>> @Table(name = "ACCOUNT")
>>> @NamedQuery(name="findThem", query="SELECT a FROM Account a")
>>> public class Account implements Serializable {
>>>
>>> /** The account number is the primary key for the persistent object
>>> */
>>> @Id
>>> public int accountNumber;
>>>
>>> public String ownerName;
>>>
>>> public int balance;
>>>
>>> @Version
>>> public int version;
>>>
>>> /**
>>> * Entity beans must have a public no-arg constructor
>>> */
>>> public Account() {
>>> // our own primary key generation, workaround for the
>>> // time being as persistence does not support
>>> // auto-generation
>>> accountNumber = (int) System.nanoTime();
>>> }
>>>
>>> public String toString() {
>>> return "Acc.# " + accountNumber + ", owner" + ownerName + ",
>>> balance: " + balance
>>> + " $";
>>> }
>>>
>>> @PrePersist
>>> void prepersist() {
>>> System.out.println("pre persist!!");
>>> }
>>>
>>> @PreUpdate
>>> void preupdate() {
>>> System.out.println("pre update!!");
>>> }
>>>
>>> @PostUpdate
>>> void postupdate() {
>>> System.out.println("post update!!");
>>> }
>>>
>>> @PostLoad
>>> void postload() {
>>> System.out.println("post load!!");
>>> }
>>>
>>> }
>>> **********************************************************************
>>>
>>> In the servlet I have the following code
>>>
>>> **********************************************************************
>>>
>>> bank = (Bank)ctx.lookup("BankBeanRemote");
>>> account =
>>> bank.findAccount(Integer.parseInt(request.getParameter("accNo")));
>>>
>>> out.println("account Number =
>>> "+account.accountNumber+"<br/>");
>>> out.println("ownerName = "+account.ownerName+"<br/>");
>>> out.println("balance = "+account.balance+"<br/>");
>>> out.println("version = "+account.version+"<br/>");
>>>
>>>
>>> accountNumber = account.accountNumber;
>>>
>>> out.println("Depositing Rs.100"+"<br/>");
>>>
>>> bank.deposit(accountNumber,100);
>>>
>>> **********************************************************************
>>>
>>> When I run the servlet, it is able to load the account values from the
>>> "account =
>>> bank.findAccount(Integer.parseInt(request.getParameter("accNo")));"
>>> statement. However, the "bank.deposit(accountNumber,100);" is not
>>> updating
>>> the "balance" field.
>>>
>>> What is the problem?? I have the following persistence.xml file
>>>
>>> *****************************************************************************************************
>>> <?xml version="1.0" encoding="UTF-8"?>
>>> <persistence xmlns="http://java.sun.com/xml/ns/persistence"
>>> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
>>> version="1.0"
>>> xsi:schemaLocation="
>>> http://java.sun.com/xml/ns/persistence
>>> http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd">
>>> <persistence-unit name="BankPU">
>>> <description>Bank example</description>
>>>
>>>
>>> <provider>org.apache.openjpa.persistence.PersistenceProviderImpl</provider>
>>> <class>sample.jpa.Account</class>
>>> <properties>
>>> <property name="openjpa.ConnectionURL"
>>> value="jdbc:derby:BankDB"
>>> />
>>> <property name="openjpa.ConnectionDriverName"
>>> value="org.apache.derby.jdbc.EmbeddedDriver" />
>>> <property name="ConnectionUserName" value="app" />
>>> <property name="openjpa.jdbc.SynchronizeMappings"
>>> value="false"
>>> />
>>> </properties>
>>> </persistence-unit>
>>> <!--
>>> <jta-data-source>PhoneBookPool</jta-data-source>
>>> <non-jta-data-source>PhoneBookPool</non-jta-data-source>
>>> -->
>>> </persistence>
>>>
>>>
>>> **********************************************************************************************************
>>>
>>> On Wed, May 7, 2008 at 10:52 AM, Phani Madgula <
>>> phanibalaji.madgula@gmail.com> wrote:
>>>
>>> Hi,
>>>> I have an EJB application using JPA and a web application looking up
>>>> ejbs
>>>> in EJB application. I am able to deploy both the applications on AG2.1
>>>> server. But when I hit the servlet, I get the following error in the
>>>> console.
>>>> *****
>>>> Message: The bean encountered a non-application exception.; nested
>>>> exception is:
>>>>
>>>> <openjpa-1.0.1-r420667:592145 fatal user error>
>>>> org.apache.openjpa.persi
>>>> stence.ArgumentException: Could not locate metadata for the class
>>>> using
>>>> alias "A
>>>> ccount". This could mean that the OpenJPA enhancer or load-time weaver
>>>> was
>>>> not r
>>>> un on the type whose alias is "Account". Registered alias mappings:
>>>> "{Account=nu
>>>> ll}"
>>>> *****
>>>>
>>>> The ejb app is attached to mail. Any suggestions on what is missing
>>>> here??
>>>>
>>>> Thanks
>>>> Phani
>>>>
>>>>
>
Re: JPA Problem
Posted by Phani Madgula <ph...@gmail.com>.
Hi,
In the BeankBean.java there is another method "update()" as follows.
___________________________________________________________
public void update(Account a) {
manager.merge(a);
}
_____________________________________________________________
I called this method in the servlet as follows.
______________________________________________________________
account.balance=1000;
bank.update(account);
out.println("<h2>Printing the account details after
merging the amount</h2>");
account =
bank.findAccount(Integer.parseInt(request.getParameter("accNo")));
out.println("account Number =
"+account.accountNumber);
out.println("ownerName = "+account.ownerName);
out.println("balance = "+account.balance);
out.println("version = "+account.version);*/
_________________________________________________________________
In the above case, the database table field account.balance is updated with
1000. But somehow I am not able to make "deposit()" function work.
I tried even the following code as well for "deposit()" method without any
success.
____________________________________________________________________
public void deposit(int accountNumber, int amount) {
Account account = manager.find(Account.class, accountNumber);
account.balance += amount;
System.out.println("New balance="+account.balance);
manager.merge(account);
}
____________________________________________________________________
Can somebody throw some light on this issue??
Thanks
Phani
On Thu, May 8, 2008 at 10:16 AM, Phani Madgula <
phanibalaji.madgula@gmail.com> wrote:
> After the step (4), please insert a row in the account table as follows.
>
> "insert into account values (1, 'Owner Name1', 500, 1);"
>
> Thanks
> Phani B madgula
>
>
>
> On Thu, May 8, 2008 at 10:14 AM, Phani Madgula <
> phanibalaji.madgula@gmail.com> wrote:
>
>> Hi Jay,
>> I have not explicitly declared transaction configuration. So, the server
>> should run the the method with "TxRequired". The same info has been logged
>> to geronimo.log.
>>
>> I am attaching the apps 1) EJB app 2) WEB app to test ejb app. You may
>> have a look at the apps. The following are the steps to recreate the
>> problem.
>>
>> 1. Create BankDB database in the embedded derby db server using DB manager
>> portlet.
>> 2. Create Account table using "create table account (accountnumber
>> integer, ownername varchar(50), balance integer, version integer)"
>> 3. Deploy the EJB app
>> 4. Deploy the WEB app
>> 5. Hit the URL in browser window -->
>> http://localhost:8080/AccountCreateWEB/Test?accNo=1
>>
>> We could see that servlet is calling deposit(accountnumber ,100) method
>> but the value is not being updated in the database.
>>
>> Thanks
>> Phani
>>
>>
>> On Wed, May 7, 2008 at 2:56 PM, Jay D. McHugh <ja...@gmail.com>
>> wrote:
>>
>>> Phani,
>>>
>>> Are you specifying that you want to use container managed persistence in
>>> your BankBean?
>>>
>>> The way to do this with an annotation would be:
>>> @TransactionManagement(TransactionManagementType.CONTAINER)
>>>
>>> If you are specifying container managed persistence then you wouldn't
>>> need to worry about starting and committing your transaction - and the code
>>> for your 'deposit' method would work. Actually, you don't even need the
>>> 'manager.merge(account)'.
>>>
>>> But, if you are not specifying container managed persistence - then you
>>> need to get a UserTransaction and begin/commit it to have your account
>>> balance change in your database.
>>>
>>> Hope that helps,
>>>
>>> Jay
>>>
>>>
>>> Phani Madgula wrote:
>>>
>>>> Hi,
>>>>
>>>> I got past the above error but experiencing some strange results as
>>>> follows.
>>>>
>>>> In the BankBean.java, I have the following method.
>>>>
>>>> *********
>>>> public void deposit(int accountNumber, int amount) {
>>>> Account account = manager.find(Account.class, accountNumber);
>>>> account.balance += amount;
>>>> System.out.println("New balance="+account.balance);
>>>> System.out.println("Merging the account");
>>>> manager.merge(account);
>>>> }
>>>> *********
>>>>
>>>> I have the Account.java as follows.
>>>> **********************************************************************
>>>> package sample.jpa;
>>>>
>>>> import java.io.Serializable;
>>>>
>>>> import javax.persistence.Entity;
>>>> import javax.persistence.Id;
>>>> import javax.persistence.NamedQuery;
>>>> import javax.persistence.PostLoad;
>>>> import javax.persistence.PostUpdate;
>>>> import javax.persistence.PrePersist;
>>>> import javax.persistence.PreUpdate;
>>>> import javax.persistence.Version;
>>>> import javax.persistence.Table;
>>>>
>>>> /**
>>>> * This demo entity represents a Bank Account.
>>>> * <p>
>>>> * The entity is not a remote object and can only be accessed locally by
>>>> * clients. However, it is made serializable so that instances can be
>>>> passed
>>>> by
>>>> * value to remote clients for local inspection.
>>>> * <p>
>>>> * Access to persistent state is by direct field access.
>>>> */
>>>> @Entity
>>>> @Table(name = "ACCOUNT")
>>>> @NamedQuery(name="findThem", query="SELECT a FROM Account a")
>>>> public class Account implements Serializable {
>>>>
>>>> /** The account number is the primary key for the persistent object
>>>> */
>>>> @Id
>>>> public int accountNumber;
>>>>
>>>> public String ownerName;
>>>>
>>>> public int balance;
>>>>
>>>> @Version
>>>> public int version;
>>>>
>>>> /**
>>>> * Entity beans must have a public no-arg constructor
>>>> */
>>>> public Account() {
>>>> // our own primary key generation, workaround for the
>>>> // time being as persistence does not support
>>>> // auto-generation
>>>> accountNumber = (int) System.nanoTime();
>>>> }
>>>>
>>>> public String toString() {
>>>> return "Acc.# " + accountNumber + ", owner" + ownerName + ",
>>>> balance: " + balance
>>>> + " $";
>>>> }
>>>>
>>>> @PrePersist
>>>> void prepersist() {
>>>> System.out.println("pre persist!!");
>>>> }
>>>>
>>>> @PreUpdate
>>>> void preupdate() {
>>>> System.out.println("pre update!!");
>>>> }
>>>>
>>>> @PostUpdate
>>>> void postupdate() {
>>>> System.out.println("post update!!");
>>>> }
>>>>
>>>> @PostLoad
>>>> void postload() {
>>>> System.out.println("post load!!");
>>>> }
>>>>
>>>> }
>>>> **********************************************************************
>>>>
>>>> In the servlet I have the following code
>>>>
>>>> **********************************************************************
>>>>
>>>> bank = (Bank)ctx.lookup("BankBeanRemote");
>>>> account =
>>>> bank.findAccount(Integer.parseInt(request.getParameter("accNo")));
>>>>
>>>> out.println("account Number =
>>>> "+account.accountNumber+"<br/>");
>>>> out.println("ownerName = "+account.ownerName+"<br/>");
>>>> out.println("balance = "+account.balance+"<br/>");
>>>> out.println("version = "+account.version+"<br/>");
>>>>
>>>>
>>>> accountNumber = account.accountNumber;
>>>>
>>>> out.println("Depositing Rs.100"+"<br/>");
>>>>
>>>> bank.deposit(accountNumber,100);
>>>>
>>>> **********************************************************************
>>>>
>>>> When I run the servlet, it is able to load the account values from the
>>>> "account =
>>>> bank.findAccount(Integer.parseInt(request.getParameter("accNo")));"
>>>> statement. However, the "bank.deposit(accountNumber,100);" is not
>>>> updating
>>>> the "balance" field.
>>>>
>>>> What is the problem?? I have the following persistence.xml file
>>>>
>>>> *****************************************************************************************************
>>>> <?xml version="1.0" encoding="UTF-8"?>
>>>> <persistence xmlns="http://java.sun.com/xml/ns/persistence"
>>>> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
>>>> version="1.0"
>>>> xsi:schemaLocation="
>>>> http://java.sun.com/xml/ns/persistence
>>>> http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd">
>>>> <persistence-unit name="BankPU">
>>>> <description>Bank example</description>
>>>>
>>>>
>>>> <provider>org.apache.openjpa.persistence.PersistenceProviderImpl</provider>
>>>> <class>sample.jpa.Account</class>
>>>> <properties>
>>>> <property name="openjpa.ConnectionURL"
>>>> value="jdbc:derby:BankDB"
>>>> />
>>>> <property name="openjpa.ConnectionDriverName"
>>>> value="org.apache.derby.jdbc.EmbeddedDriver" />
>>>> <property name="ConnectionUserName" value="app" />
>>>> <property name="openjpa.jdbc.SynchronizeMappings"
>>>> value="false"
>>>> />
>>>> </properties>
>>>> </persistence-unit>
>>>> <!--
>>>> <jta-data-source>PhoneBookPool</jta-data-source>
>>>> <non-jta-data-source>PhoneBookPool</non-jta-data-source>
>>>> -->
>>>> </persistence>
>>>>
>>>>
>>>> **********************************************************************************************************
>>>>
>>>> On Wed, May 7, 2008 at 10:52 AM, Phani Madgula <
>>>> phanibalaji.madgula@gmail.com> wrote:
>>>>
>>>> Hi,
>>>>>
>>>>> I have an EJB application using JPA and a web application looking up
>>>>> ejbs
>>>>> in EJB application. I am able to deploy both the applications on AG2.1
>>>>> server. But when I hit the servlet, I get the following error in the
>>>>> console.
>>>>> *****
>>>>> Message: The bean encountered a non-application exception.; nested
>>>>> exception is:
>>>>>
>>>>> <openjpa-1.0.1-r420667:592145 fatal user error>
>>>>> org.apache.openjpa.persi
>>>>> stence.ArgumentException: Could not locate metadata for the class using
>>>>> alias "A
>>>>> ccount". This could mean that the OpenJPA enhancer or load-time weaver
>>>>> was
>>>>> not r
>>>>> un on the type whose alias is "Account". Registered alias mappings:
>>>>> "{Account=nu
>>>>> ll}"
>>>>> *****
>>>>>
>>>>> The ejb app is attached to mail. Any suggestions on what is missing
>>>>> here??
>>>>>
>>>>> Thanks
>>>>> Phani
>>>>>
>>>>>
>>>>
>>
>
Re: JPA Problem
Posted by Phani Madgula <ph...@gmail.com>.
After the step (4), please insert a row in the account table as follows.
"insert into account values (1, 'Owner Name1', 500, 1);"
Thanks
Phani B madgula
On Thu, May 8, 2008 at 10:14 AM, Phani Madgula <
phanibalaji.madgula@gmail.com> wrote:
> Hi Jay,
> I have not explicitly declared transaction configuration. So, the server
> should run the the method with "TxRequired". The same info has been logged
> to geronimo.log.
>
> I am attaching the apps 1) EJB app 2) WEB app to test ejb app. You may
> have a look at the apps. The following are the steps to recreate the
> problem.
>
> 1. Create BankDB database in the embedded derby db server using DB manager
> portlet.
> 2. Create Account table using "create table account (accountnumber
> integer, ownername varchar(50), balance integer, version integer)"
> 3. Deploy the EJB app
> 4. Deploy the WEB app
> 5. Hit the URL in browser window -->
> http://localhost:8080/AccountCreateWEB/Test?accNo=1
>
> We could see that servlet is calling deposit(accountnumber ,100) method
> but the value is not being updated in the database.
>
> Thanks
> Phani
>
>
> On Wed, May 7, 2008 at 2:56 PM, Jay D. McHugh <ja...@gmail.com>
> wrote:
>
> > Phani,
> >
> > Are you specifying that you want to use container managed persistence in
> > your BankBean?
> >
> > The way to do this with an annotation would be:
> > @TransactionManagement(TransactionManagementType.CONTAINER)
> >
> > If you are specifying container managed persistence then you wouldn't
> > need to worry about starting and committing your transaction - and the code
> > for your 'deposit' method would work. Actually, you don't even need the
> > 'manager.merge(account)'.
> >
> > But, if you are not specifying container managed persistence - then you
> > need to get a UserTransaction and begin/commit it to have your account
> > balance change in your database.
> >
> > Hope that helps,
> >
> > Jay
> >
> >
> > Phani Madgula wrote:
> >
> > > Hi,
> > >
> > > I got past the above error but experiencing some strange results as
> > > follows.
> > >
> > > In the BankBean.java, I have the following method.
> > >
> > > *********
> > > public void deposit(int accountNumber, int amount) {
> > > Account account = manager.find(Account.class,
> > > accountNumber);
> > > account.balance += amount;
> > > System.out.println("New balance="+account.balance);
> > > System.out.println("Merging the account");
> > > manager.merge(account);
> > > }
> > > *********
> > >
> > > I have the Account.java as follows.
> > > **********************************************************************
> > > package sample.jpa;
> > >
> > > import java.io.Serializable;
> > >
> > > import javax.persistence.Entity;
> > > import javax.persistence.Id;
> > > import javax.persistence.NamedQuery;
> > > import javax.persistence.PostLoad;
> > > import javax.persistence.PostUpdate;
> > > import javax.persistence.PrePersist;
> > > import javax.persistence.PreUpdate;
> > > import javax.persistence.Version;
> > > import javax.persistence.Table;
> > >
> > > /**
> > > * This demo entity represents a Bank Account.
> > > * <p>
> > > * The entity is not a remote object and can only be accessed locally
> > > by
> > > * clients. However, it is made serializable so that instances can be
> > > passed
> > > by
> > > * value to remote clients for local inspection.
> > > * <p>
> > > * Access to persistent state is by direct field access.
> > > */
> > > @Entity
> > > @Table(name = "ACCOUNT")
> > > @NamedQuery(name="findThem", query="SELECT a FROM Account a")
> > > public class Account implements Serializable {
> > >
> > > /** The account number is the primary key for the persistent object
> > > */
> > > @Id
> > > public int accountNumber;
> > >
> > > public String ownerName;
> > >
> > > public int balance;
> > >
> > > @Version
> > > public int version;
> > >
> > > /**
> > > * Entity beans must have a public no-arg constructor
> > > */
> > > public Account() {
> > > // our own primary key generation, workaround for the
> > > // time being as persistence does not support
> > > // auto-generation
> > > accountNumber = (int) System.nanoTime();
> > > }
> > >
> > > public String toString() {
> > > return "Acc.# " + accountNumber + ", owner" + ownerName + ",
> > > balance: " + balance
> > > + " $";
> > > }
> > >
> > > @PrePersist
> > > void prepersist() {
> > > System.out.println("pre persist!!");
> > > }
> > >
> > > @PreUpdate
> > > void preupdate() {
> > > System.out.println("pre update!!");
> > > }
> > >
> > > @PostUpdate
> > > void postupdate() {
> > > System.out.println("post update!!");
> > > }
> > >
> > > @PostLoad
> > > void postload() {
> > > System.out.println("post load!!");
> > > }
> > >
> > > }
> > > **********************************************************************
> > >
> > > In the servlet I have the following code
> > >
> > > **********************************************************************
> > >
> > > bank = (Bank)ctx.lookup("BankBeanRemote");
> > > account =
> > > bank.findAccount(Integer.parseInt(request.getParameter("accNo")));
> > >
> > > out.println("account Number =
> > > "+account.accountNumber+"<br/>");
> > > out.println("ownerName = "+account.ownerName+"<br/>");
> > > out.println("balance = "+account.balance+"<br/>");
> > > out.println("version = "+account.version+"<br/>");
> > >
> > >
> > > accountNumber = account.accountNumber;
> > >
> > > out.println("Depositing Rs.100"+"<br/>");
> > >
> > > bank.deposit(accountNumber,100);
> > >
> > > **********************************************************************
> > >
> > > When I run the servlet, it is able to load the account values from the
> > > "account =
> > > bank.findAccount(Integer.parseInt(request.getParameter("accNo")));"
> > > statement. However, the "bank.deposit(accountNumber,100);" is not
> > > updating
> > > the "balance" field.
> > >
> > > What is the problem?? I have the following persistence.xml file
> > >
> > > *****************************************************************************************************
> > > <?xml version="1.0" encoding="UTF-8"?>
> > > <persistence xmlns="http://java.sun.com/xml/ns/persistence"
> > > xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
> > > version="1.0"
> > > xsi:schemaLocation="
> > > http://java.sun.com/xml/ns/persistence
> > > http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd">
> > > <persistence-unit name="BankPU">
> > > <description>Bank example</description>
> > >
> > >
> > > <provider>org.apache.openjpa.persistence.PersistenceProviderImpl</provider>
> > > <class>sample.jpa.Account</class>
> > > <properties>
> > > <property name="openjpa.ConnectionURL"
> > > value="jdbc:derby:BankDB"
> > > />
> > > <property name="openjpa.ConnectionDriverName"
> > > value="org.apache.derby.jdbc.EmbeddedDriver" />
> > > <property name="ConnectionUserName" value="app" />
> > > <property name="openjpa.jdbc.SynchronizeMappings"
> > > value="false"
> > > />
> > > </properties>
> > > </persistence-unit>
> > > <!--
> > > <jta-data-source>PhoneBookPool</jta-data-source>
> > > <non-jta-data-source>PhoneBookPool</non-jta-data-source>
> > > -->
> > > </persistence>
> > >
> > >
> > > **********************************************************************************************************
> > >
> > > On Wed, May 7, 2008 at 10:52 AM, Phani Madgula <
> > > phanibalaji.madgula@gmail.com> wrote:
> > >
> > > Hi,
> > > >
> > > > I have an EJB application using JPA and a web application looking up
> > > > ejbs
> > > > in EJB application. I am able to deploy both the applications on
> > > > AG2.1
> > > > server. But when I hit the servlet, I get the following error in the
> > > > console.
> > > > *****
> > > > Message: The bean encountered a non-application exception.; nested
> > > > exception is:
> > > >
> > > > <openjpa-1.0.1-r420667:592145 fatal user error>
> > > > org.apache.openjpa.persi
> > > > stence.ArgumentException: Could not locate metadata for the class
> > > > using
> > > > alias "A
> > > > ccount". This could mean that the OpenJPA enhancer or load-time
> > > > weaver was
> > > > not r
> > > > un on the type whose alias is "Account". Registered alias mappings:
> > > > "{Account=nu
> > > > ll}"
> > > > *****
> > > >
> > > > The ejb app is attached to mail. Any suggestions on what is missing
> > > > here??
> > > >
> > > > Thanks
> > > > Phani
> > > >
> > > >
> > >
>
Re: JPA Problem
Posted by Phani Madgula <ph...@gmail.com>.
Hi Jay,
I have not explicitly declared transaction configuration. So, the server
should run the the method with "TxRequired". The same info has been logged
to geronimo.log.
I am attaching the apps 1) EJB app 2) WEB app to test ejb app. You may have
a look at the apps. The following are the steps to recreate the problem.
1. Create BankDB database in the embedded derby db server using DB manager
portlet.
2. Create Account table using "create table account (accountnumber integer,
ownername varchar(50), balance integer, version integer)"
3. Deploy the EJB app
4. Deploy the WEB app
5. Hit the URL in browser window -->
http://localhost:8080/AccountCreateWEB/Test?accNo=1
We could see that servlet is calling deposit(accountnumber ,100) method but
the value is not being updated in the database.
Thanks
Phani
On Wed, May 7, 2008 at 2:56 PM, Jay D. McHugh <ja...@gmail.com> wrote:
> Phani,
>
> Are you specifying that you want to use container managed persistence in
> your BankBean?
>
> The way to do this with an annotation would be:
> @TransactionManagement(TransactionManagementType.CONTAINER)
>
> If you are specifying container managed persistence then you wouldn't need
> to worry about starting and committing your transaction - and the code for
> your 'deposit' method would work. Actually, you don't even need the
> 'manager.merge(account)'.
>
> But, if you are not specifying container managed persistence - then you
> need to get a UserTransaction and begin/commit it to have your account
> balance change in your database.
>
> Hope that helps,
>
> Jay
>
>
> Phani Madgula wrote:
>
> > Hi,
> >
> > I got past the above error but experiencing some strange results as
> > follows.
> >
> > In the BankBean.java, I have the following method.
> >
> > *********
> > public void deposit(int accountNumber, int amount) {
> > Account account = manager.find(Account.class, accountNumber);
> > account.balance += amount;
> > System.out.println("New balance="+account.balance);
> > System.out.println("Merging the account");
> > manager.merge(account);
> > }
> > *********
> >
> > I have the Account.java as follows.
> > **********************************************************************
> > package sample.jpa;
> >
> > import java.io.Serializable;
> >
> > import javax.persistence.Entity;
> > import javax.persistence.Id;
> > import javax.persistence.NamedQuery;
> > import javax.persistence.PostLoad;
> > import javax.persistence.PostUpdate;
> > import javax.persistence.PrePersist;
> > import javax.persistence.PreUpdate;
> > import javax.persistence.Version;
> > import javax.persistence.Table;
> >
> > /**
> > * This demo entity represents a Bank Account.
> > * <p>
> > * The entity is not a remote object and can only be accessed locally by
> > * clients. However, it is made serializable so that instances can be
> > passed
> > by
> > * value to remote clients for local inspection.
> > * <p>
> > * Access to persistent state is by direct field access.
> > */
> > @Entity
> > @Table(name = "ACCOUNT")
> > @NamedQuery(name="findThem", query="SELECT a FROM Account a")
> > public class Account implements Serializable {
> >
> > /** The account number is the primary key for the persistent object
> > */
> > @Id
> > public int accountNumber;
> >
> > public String ownerName;
> >
> > public int balance;
> >
> > @Version
> > public int version;
> >
> > /**
> > * Entity beans must have a public no-arg constructor
> > */
> > public Account() {
> > // our own primary key generation, workaround for the
> > // time being as persistence does not support
> > // auto-generation
> > accountNumber = (int) System.nanoTime();
> > }
> >
> > public String toString() {
> > return "Acc.# " + accountNumber + ", owner" + ownerName + ",
> > balance: " + balance
> > + " $";
> > }
> >
> > @PrePersist
> > void prepersist() {
> > System.out.println("pre persist!!");
> > }
> >
> > @PreUpdate
> > void preupdate() {
> > System.out.println("pre update!!");
> > }
> >
> > @PostUpdate
> > void postupdate() {
> > System.out.println("post update!!");
> > }
> >
> > @PostLoad
> > void postload() {
> > System.out.println("post load!!");
> > }
> >
> > }
> > **********************************************************************
> >
> > In the servlet I have the following code
> >
> > **********************************************************************
> >
> > bank = (Bank)ctx.lookup("BankBeanRemote");
> > account =
> > bank.findAccount(Integer.parseInt(request.getParameter("accNo")));
> >
> > out.println("account Number =
> > "+account.accountNumber+"<br/>");
> > out.println("ownerName = "+account.ownerName+"<br/>");
> > out.println("balance = "+account.balance+"<br/>");
> > out.println("version = "+account.version+"<br/>");
> >
> >
> > accountNumber = account.accountNumber;
> >
> > out.println("Depositing Rs.100"+"<br/>");
> >
> > bank.deposit(accountNumber,100);
> >
> > **********************************************************************
> >
> > When I run the servlet, it is able to load the account values from the
> > "account =
> > bank.findAccount(Integer.parseInt(request.getParameter("accNo")));"
> > statement. However, the "bank.deposit(accountNumber,100);" is not
> > updating
> > the "balance" field.
> >
> > What is the problem?? I have the following persistence.xml file
> >
> > *****************************************************************************************************
> > <?xml version="1.0" encoding="UTF-8"?>
> > <persistence xmlns="http://java.sun.com/xml/ns/persistence"
> > xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
> > version="1.0"
> > xsi:schemaLocation="
> > http://java.sun.com/xml/ns/persistence
> > http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd">
> > <persistence-unit name="BankPU">
> > <description>Bank example</description>
> >
> >
> > <provider>org.apache.openjpa.persistence.PersistenceProviderImpl</provider>
> > <class>sample.jpa.Account</class>
> > <properties>
> > <property name="openjpa.ConnectionURL"
> > value="jdbc:derby:BankDB"
> > />
> > <property name="openjpa.ConnectionDriverName"
> > value="org.apache.derby.jdbc.EmbeddedDriver" />
> > <property name="ConnectionUserName" value="app" />
> > <property name="openjpa.jdbc.SynchronizeMappings"
> > value="false"
> > />
> > </properties>
> > </persistence-unit>
> > <!--
> > <jta-data-source>PhoneBookPool</jta-data-source>
> > <non-jta-data-source>PhoneBookPool</non-jta-data-source>
> > -->
> > </persistence>
> >
> >
> > **********************************************************************************************************
> >
> > On Wed, May 7, 2008 at 10:52 AM, Phani Madgula <
> > phanibalaji.madgula@gmail.com> wrote:
> >
> > Hi,
> > >
> > > I have an EJB application using JPA and a web application looking up
> > > ejbs
> > > in EJB application. I am able to deploy both the applications on AG2.1
> > > server. But when I hit the servlet, I get the following error in the
> > > console.
> > > *****
> > > Message: The bean encountered a non-application exception.; nested
> > > exception is:
> > >
> > > <openjpa-1.0.1-r420667:592145 fatal user error>
> > > org.apache.openjpa.persi
> > > stence.ArgumentException: Could not locate metadata for the class
> > > using
> > > alias "A
> > > ccount". This could mean that the OpenJPA enhancer or load-time weaver
> > > was
> > > not r
> > > un on the type whose alias is "Account". Registered alias mappings:
> > > "{Account=nu
> > > ll}"
> > > *****
> > >
> > > The ejb app is attached to mail. Any suggestions on what is missing
> > > here??
> > >
> > > Thanks
> > > Phani
> > >
> > >
> >
Re: JPA Problem
Posted by "Jay D. McHugh" <ja...@gmail.com>.
Phani,
Are you specifying that you want to use container managed persistence in
your BankBean?
The way to do this with an annotation would be:
@TransactionManagement(TransactionManagementType.CONTAINER)
If you are specifying container managed persistence then you wouldn't
need to worry about starting and committing your transaction - and the
code for your 'deposit' method would work. Actually, you don't even
need the 'manager.merge(account)'.
But, if you are not specifying container managed persistence - then you
need to get a UserTransaction and begin/commit it to have your account
balance change in your database.
Hope that helps,
Jay
Phani Madgula wrote:
> Hi,
>
> I got past the above error but experiencing some strange results as follows.
>
> In the BankBean.java, I have the following method.
>
> *********
> public void deposit(int accountNumber, int amount) {
> Account account = manager.find(Account.class, accountNumber);
> account.balance += amount;
> System.out.println("New balance="+account.balance);
> System.out.println("Merging the account");
> manager.merge(account);
> }
> *********
>
> I have the Account.java as follows.
> **********************************************************************
> package sample.jpa;
>
> import java.io.Serializable;
>
> import javax.persistence.Entity;
> import javax.persistence.Id;
> import javax.persistence.NamedQuery;
> import javax.persistence.PostLoad;
> import javax.persistence.PostUpdate;
> import javax.persistence.PrePersist;
> import javax.persistence.PreUpdate;
> import javax.persistence.Version;
> import javax.persistence.Table;
>
> /**
> * This demo entity represents a Bank Account.
> * <p>
> * The entity is not a remote object and can only be accessed locally by
> * clients. However, it is made serializable so that instances can be passed
> by
> * value to remote clients for local inspection.
> * <p>
> * Access to persistent state is by direct field access.
> */
> @Entity
> @Table(name = "ACCOUNT")
> @NamedQuery(name="findThem", query="SELECT a FROM Account a")
> public class Account implements Serializable {
>
> /** The account number is the primary key for the persistent object */
> @Id
> public int accountNumber;
>
> public String ownerName;
>
> public int balance;
>
> @Version
> public int version;
>
> /**
> * Entity beans must have a public no-arg constructor
> */
> public Account() {
> // our own primary key generation, workaround for the
> // time being as persistence does not support
> // auto-generation
> accountNumber = (int) System.nanoTime();
> }
>
> public String toString() {
> return "Acc.# " + accountNumber + ", owner" + ownerName + ",
> balance: " + balance
> + " $";
> }
>
> @PrePersist
> void prepersist() {
> System.out.println("pre persist!!");
> }
>
> @PreUpdate
> void preupdate() {
> System.out.println("pre update!!");
> }
>
> @PostUpdate
> void postupdate() {
> System.out.println("post update!!");
> }
>
> @PostLoad
> void postload() {
> System.out.println("post load!!");
> }
>
> }
> **********************************************************************
>
> In the servlet I have the following code
>
> **********************************************************************
>
> bank = (Bank)ctx.lookup("BankBeanRemote");
> account =
> bank.findAccount(Integer.parseInt(request.getParameter("accNo")));
>
> out.println("account Number =
> "+account.accountNumber+"<br/>");
> out.println("ownerName = "+account.ownerName+"<br/>");
> out.println("balance = "+account.balance+"<br/>");
> out.println("version = "+account.version+"<br/>");
>
>
> accountNumber = account.accountNumber;
>
> out.println("Depositing Rs.100"+"<br/>");
>
> bank.deposit(accountNumber,100);
>
> **********************************************************************
>
> When I run the servlet, it is able to load the account values from the
> "account =
> bank.findAccount(Integer.parseInt(request.getParameter("accNo")));"
> statement. However, the "bank.deposit(accountNumber,100);" is not updating
> the "balance" field.
>
> What is the problem?? I have the following persistence.xml file
> *****************************************************************************************************
> <?xml version="1.0" encoding="UTF-8"?>
> <persistence xmlns="http://java.sun.com/xml/ns/persistence"
> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
> version="1.0"
> xsi:schemaLocation="http://java.sun.com/xml/ns/persistence
> http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd">
> <persistence-unit name="BankPU">
> <description>Bank example</description>
>
> <provider>org.apache.openjpa.persistence.PersistenceProviderImpl</provider>
> <class>sample.jpa.Account</class>
> <properties>
> <property name="openjpa.ConnectionURL" value="jdbc:derby:BankDB"
> />
> <property name="openjpa.ConnectionDriverName"
> value="org.apache.derby.jdbc.EmbeddedDriver" />
> <property name="ConnectionUserName" value="app" />
> <property name="openjpa.jdbc.SynchronizeMappings" value="false"
> />
> </properties>
> </persistence-unit>
> <!--
> <jta-data-source>PhoneBookPool</jta-data-source>
> <non-jta-data-source>PhoneBookPool</non-jta-data-source>
> -->
> </persistence>
>
> **********************************************************************************************************
>
> On Wed, May 7, 2008 at 10:52 AM, Phani Madgula <
> phanibalaji.madgula@gmail.com> wrote:
>
>> Hi,
>>
>> I have an EJB application using JPA and a web application looking up ejbs
>> in EJB application. I am able to deploy both the applications on AG2.1
>> server. But when I hit the servlet, I get the following error in the
>> console.
>> *****
>> Message: The bean encountered a non-application exception.; nested
>> exception is:
>>
>> <openjpa-1.0.1-r420667:592145 fatal user error>
>> org.apache.openjpa.persi
>> stence.ArgumentException: Could not locate metadata for the class using
>> alias "A
>> ccount". This could mean that the OpenJPA enhancer or load-time weaver was
>> not r
>> un on the type whose alias is "Account". Registered alias mappings:
>> "{Account=nu
>> ll}"
>> *****
>>
>> The ejb app is attached to mail. Any suggestions on what is missing here??
>>
>> Thanks
>> Phani
>>
>
Re: JPA Problem
Posted by Phani Madgula <ph...@gmail.com>.
Hi,
I got past the above error but experiencing some strange results as follows.
In the BankBean.java, I have the following method.
*********
public void deposit(int accountNumber, int amount) {
Account account = manager.find(Account.class, accountNumber);
account.balance += amount;
System.out.println("New balance="+account.balance);
System.out.println("Merging the account");
manager.merge(account);
}
*********
I have the Account.java as follows.
**********************************************************************
package sample.jpa;
import java.io.Serializable;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.NamedQuery;
import javax.persistence.PostLoad;
import javax.persistence.PostUpdate;
import javax.persistence.PrePersist;
import javax.persistence.PreUpdate;
import javax.persistence.Version;
import javax.persistence.Table;
/**
* This demo entity represents a Bank Account.
* <p>
* The entity is not a remote object and can only be accessed locally by
* clients. However, it is made serializable so that instances can be passed
by
* value to remote clients for local inspection.
* <p>
* Access to persistent state is by direct field access.
*/
@Entity
@Table(name = "ACCOUNT")
@NamedQuery(name="findThem", query="SELECT a FROM Account a")
public class Account implements Serializable {
/** The account number is the primary key for the persistent object */
@Id
public int accountNumber;
public String ownerName;
public int balance;
@Version
public int version;
/**
* Entity beans must have a public no-arg constructor
*/
public Account() {
// our own primary key generation, workaround for the
// time being as persistence does not support
// auto-generation
accountNumber = (int) System.nanoTime();
}
public String toString() {
return "Acc.# " + accountNumber + ", owner" + ownerName + ",
balance: " + balance
+ " $";
}
@PrePersist
void prepersist() {
System.out.println("pre persist!!");
}
@PreUpdate
void preupdate() {
System.out.println("pre update!!");
}
@PostUpdate
void postupdate() {
System.out.println("post update!!");
}
@PostLoad
void postload() {
System.out.println("post load!!");
}
}
**********************************************************************
In the servlet I have the following code
**********************************************************************
bank = (Bank)ctx.lookup("BankBeanRemote");
account =
bank.findAccount(Integer.parseInt(request.getParameter("accNo")));
out.println("account Number =
"+account.accountNumber+"<br/>");
out.println("ownerName = "+account.ownerName+"<br/>");
out.println("balance = "+account.balance+"<br/>");
out.println("version = "+account.version+"<br/>");
accountNumber = account.accountNumber;
out.println("Depositing Rs.100"+"<br/>");
bank.deposit(accountNumber,100);
**********************************************************************
When I run the servlet, it is able to load the account values from the
"account =
bank.findAccount(Integer.parseInt(request.getParameter("accNo")));"
statement. However, the "bank.deposit(accountNumber,100);" is not updating
the "balance" field.
What is the problem?? I have the following persistence.xml file
*****************************************************************************************************
<?xml version="1.0" encoding="UTF-8"?>
<persistence xmlns="http://java.sun.com/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
version="1.0"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence
http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd">
<persistence-unit name="BankPU">
<description>Bank example</description>
<provider>org.apache.openjpa.persistence.PersistenceProviderImpl</provider>
<class>sample.jpa.Account</class>
<properties>
<property name="openjpa.ConnectionURL" value="jdbc:derby:BankDB"
/>
<property name="openjpa.ConnectionDriverName"
value="org.apache.derby.jdbc.EmbeddedDriver" />
<property name="ConnectionUserName" value="app" />
<property name="openjpa.jdbc.SynchronizeMappings" value="false"
/>
</properties>
</persistence-unit>
<!--
<jta-data-source>PhoneBookPool</jta-data-source>
<non-jta-data-source>PhoneBookPool</non-jta-data-source>
-->
</persistence>
**********************************************************************************************************
On Wed, May 7, 2008 at 10:52 AM, Phani Madgula <
phanibalaji.madgula@gmail.com> wrote:
> Hi,
>
> I have an EJB application using JPA and a web application looking up ejbs
> in EJB application. I am able to deploy both the applications on AG2.1
> server. But when I hit the servlet, I get the following error in the
> console.
> *****
> Message: The bean encountered a non-application exception.; nested
> exception is:
>
> <openjpa-1.0.1-r420667:592145 fatal user error>
> org.apache.openjpa.persi
> stence.ArgumentException: Could not locate metadata for the class using
> alias "A
> ccount". This could mean that the OpenJPA enhancer or load-time weaver was
> not r
> un on the type whose alias is "Account". Registered alias mappings:
> "{Account=nu
> ll}"
> *****
>
> The ejb app is attached to mail. Any suggestions on what is missing here??
>
> Thanks
> Phani
>