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Posted to users@tomcat.apache.org by "A. Alonso Domínguez" <al...@social-labs.com> on 2007/09/13 11:29:03 UTC

Tomcat 6.0, JPA and Resource Injection

Hi there,

I'm trying to set up a web application which uses Java Persistence with 
Tomcat 6.0. I had googled and searched a lot of mailing lists but I 
didn't found a response for my doubts.

My application uses JSF 1.2 from Sun's RI, some of the managed-beans 
defined at that application have a reference to a EntityManager using 
the PersistenceContext annotation. This application has been tested 
using Glassfish and it works perfectly.
Testing the same application (with all necessary jar files) with Tomcat 
throws an exception: javax.naming.NameNotFoundException: The name 
java:comp is not associated to this context. This is how my config files 
look like:

context.xml:
<Context path="/benedetti-gestion" reloadable="true">

    <Resource name="jdbc/benedetti" auth="Container" 
type="javax.sql.DataSource"
        maxActive="100" maxIdle="30" maxWait="10000"
        username="benedetti" password="nsh67eTds" 
driverClassName="org.postgresql.Driver"
        url="jdbc:postgresql://193.168.3.2:5432/benedetti"
    />

</Context>

persistence.xml:
<?xml version="1.0" encoding="ISO-8859-1"?>

<persistence xmlns="http://java.sun.com/xml/ns/persistence"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/persistence 
http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd"
    version="1.0">
   
    <persistence-unit name="benedetti" transaction-type="RESOURCE_LOCAL">
        <provider>
            oracle.toplink.essentials.PersistenceProvider
        </provider>
        <non-jta-data-source>jdbc/benedetti</non-jta-data-source>
        <class>benedetti.gestion.entity.Cliente</class>
        <class>benedetti.gestion.entity.Expediente</class>
        <class>benedetti.gestion.entity.Factura</class>
        <class>benedetti.gestion.entity.LineaFactura</class>
    </persistence-unit>
   
</persistence>

web.xml:
<resource-ref>
        <res-ref-name>jdbc/benedetti</res-ref-name>
        <res-type>javax.sql.DataSource</res-type>
        <res-auth>Container</res-auth>
    </resource-ref>

    <persistence-context-ref>
        
<persistence-context-ref-name>jpa/benedetti</persistence-context-ref-name>
        <persistence-unit-name>benedetti</persistence-unit-name>
    </persistence-context-ref>

I'm configuring the injection of the entity manager as following:

@PersistenceContext(unitName = "benedetti",
            name = "java:comp/jpa/benedetti")
    private EntityManager em;

About JNDI names, I tried names

Almost all I found in the web about this issue is about Tomcat 5.5. 
There is said in many places that Tomcat 5.5 should be treated as a JSE 
environment so no dependency injection of "EntityManager" nor 
"EntityManagerFactory" is possible. But, what about Tomcat 6 ?

I did take a look to the DefaultAnnotationProcessor class at 
"org.apache.catalina.util" and seems to me that class performs 
dependency injection based on the kind of annotation found.

My question is: Can I use entity manager injection with Tomcat 6 or do I 
need to perform a bootstrap using the Persistence class like in Tomcat 5.5 ?

Regards,
Alonso

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RE: Tomcat 6.0, JPA and Resource Injection

Posted by "Caldarale, Charles R" <Ch...@unisys.com>.
> From: "A. Alonso Domínguez" [mailto:alonso.dominguez@social-labs.com] 
> Subject: Re: Tomcat 6.0, JPA and Resource Injection
> 
> It seems that Tomcat 6 ignores the "<persistence-context-ref>"
> element from web.xml, is this correct?

I can't find any documentation for such an element in either the 2.4 or the 2.5 servlet specs, which is what Tomcat implements.  If you're looking for EJB 3.0 extensions beyond that, I suspect you'll have to move up to an full EE container, such as JBoss.

 - Chuck


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Re: Tomcat 6.0, JPA and Resource Injection

Posted by Christopher Schultz <ch...@christopherschultz.net>.
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Alonso,

A. Alonso Domínguez wrote:
> I have tried "java:comp/env/...", "java:/comp/env/...", "java:jpa/..."
> and "jpa/..." as values for the "name" attribute of PersistenceContext
> annotation. None of that paths worked for me. It seems that Tomcat 6
> ignores the "<persistence-context-ref>" element from web.xml, is this
> correct?

I don't really know. I haven't been able to find a DTD or schema for
web.xml that has the <persistence-context-ref> element listed, so I
wouldn't be surprised if it's not supported.

FWIW I have no experience with this particular technology, so I'm just
stabbing in the dark at JNDI issues you might have.

Good luck,
- -chris
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Re: Tomcat 6.0, JPA and Resource Injection

Posted by "A. Alonso Domínguez" <al...@social-labs.com>.
Hi Christopher,

I have tried "java:comp/env/...", "java:/comp/env/...", "java:jpa/..." 
and "jpa/..." as values for the "name" attribute of PersistenceContext 
annotation. None of that paths worked for me. It seems that Tomcat 6 
ignores the "<persistence-context-ref>" element from web.xml, is this 
correct?

Christopher Schultz escribió:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> Alonso,
>
> A. Alonso Domínguez wrote:
>   
>> javax.naming.NameNotFoundException: The name
>> java:comp is not associated to this context.
>>     
>
> [snip]
>
>   
>> @PersistenceContext(unitName = "benedetti",
>>            name = "java:comp/jpa/benedetti")
>>    private EntityManager em;
>>     
>
> Have you tried "java:/comp/..."?
>
>   
>>    <persistence-context-ref>
>>        <persistence-context-ref-name>jpa/benedetti</persistence-context-ref-name>
>>        <persistence-unit-name>benedetti</persistence-unit-name>
>>    </persistence-context-ref>
>>     
>
> Check out http://blogs.sun.com/pblaha/entry/how_to_use_entitymanager_api
>   
I've had take a look to that blog but the example posted there talks 
about GlassFish. My app has been tested in GlassFish and there it works, 
what I want to try is the same app deployed on a standalone Tomcat.

> They are putting their JNDI resource in a different place in the tree
> (in java:/comp/env/...). You may not be using the right path based on
> where Tomcat puts these resources.
>
> - -chris
>
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>   


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Re: Tomcat 6.0, JPA and Resource Injection

Posted by Christopher Schultz <ch...@christopherschultz.net>.
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Alonso,

A. Alonso Domínguez wrote:
> javax.naming.NameNotFoundException: The name
> java:comp is not associated to this context.

[snip]

> @PersistenceContext(unitName = "benedetti",
>            name = "java:comp/jpa/benedetti")
>    private EntityManager em;

Have you tried "java:/comp/..."?

>    <persistence-context-ref>
>        <persistence-context-ref-name>jpa/benedetti</persistence-context-ref-name>
>        <persistence-unit-name>benedetti</persistence-unit-name>
>    </persistence-context-ref>

Check out http://blogs.sun.com/pblaha/entry/how_to_use_entitymanager_api

They are putting their JNDI resource in a different place in the tree
(in java:/comp/env/...). You may not be using the right path based on
where Tomcat puts these resources.

- -chris

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