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Posted to user@struts.apache.org by Frank Fischer <fr...@digitalnomads.ch> on 2008/03/13 22:32:34 UTC
How to initialize business service objects?
Hi all
i'm just starting with struts2 (even with struts at all). Of course i first
read some how-to-starts. But there is one thing i don't understand.
I'm trying to create a simple little chat app. I have two action classes,
one for the normal chat user, one for the moderators. Both classes need
access to the same instances of business service classes which mainly hold
runtime data such as a list of users currently logged in, list of chat rooms
and so on.
Now i don't understand (1) where to create/initialize these business logic
classes and (2) how to get access to them from the action classes.
I'm very thankful for any hint.
Thanks a lot
Frank
Re: How to initialize business service objects?
Posted by Rushikesh Thakkar <th...@gmail.com>.
Frank,
AFAIU, you want your Business Service Object to be injected in your Struts2
actions. To achieve that, I have done this:
- Using Spring ObjectFactory.
- Declare Business Service Object (BSO) in Spring's
applicationContext.xml(you've already done that)
- Define action that has setter method for your BSO.
- Declare this action as a <bean> in applicationContext.xml, with BSO
injected as dependency.
Sample Code:
Action:
public class SetEndPoint extends ActionSupport {
private DispatcherService dispatcherService;
public String execute () throws Exception {
//-----your business logic-----
return SUCCESS;
}
// DispatcherService object will be set (i.e. injected) by Spring (see
applicationContext.xml)
*public void setDispatcherService(DispatcherService dispatcherService)*{
this.dispatcherService = dispatcherService;
}
}
applicationContext.xml
<!-- ..... your existing bean declaration for DispatcherService
remains .... ->
<!-- ..... Declare action here, injecting DispatcherService .... ->
<bean id="setEndPoint" class="example.client.web.action.SetEndPoint">
*<property name="dispatcherService">*
<ref bean="DispatcherService"/>
</property>
</bean>
struts.xml
<struts>
*<constant name="struts.objectFactory" value="spring" />*
<package name="no.bbs" extends="struts-default">
<action name="setEndPoint" method="execute" *class="setEndPoint"* >
<result name="consumeA">/view/consumeAcos.jsp</result>
<result name="consumeB">/view/consumeMapp.jsp</result>
<result name="error">/view/error.jsp</result>
</action>
</package>
</struts>
I have underlined important parts of each artifact..
I hope this helps..
-Rushikesh
On Mon, Mar 17, 2008 at 5:28 PM, Piero Sartini <li...@pierosartini.de>
wrote:
> Am Donnerstag, 13. März 2008 22:32:34 schrieb Frank Fischer:
> > Now i don't understand (1) where to create/initialize these business
> logic
> > classes and (2) how to get access to them from the action classes.
>
> Just build your business logic without thinking about s2 too much. From
> your
> action classes you can access your business logic like everything else.
> Its
> really more of a java problem how to do this =)
>
> If you have to run initialization code at startup, maybe a normal Listener
> is
> what you are looking for...
>
> Piero
>
>
>
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>
>
Re: How to initialize business service objects?
Posted by Piero Sartini <li...@pierosartini.de>.
Am Donnerstag, 13. März 2008 22:32:34 schrieb Frank Fischer:
> Now i don't understand (1) where to create/initialize these business logic
> classes and (2) how to get access to them from the action classes.
Just build your business logic without thinking about s2 too much. From your
action classes you can access your business logic like everything else. Its
really more of a java problem how to do this =)
If you have to run initialization code at startup, maybe a normal Listener is
what you are looking for...
Piero
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RE: How to initialize business service objects?
Posted by "Griffith, Michael *" <Mi...@fda.hhs.gov>.
Frank,
I would check your struts.properties file:
Make sure it has these entries and that it is on your classpath (i.e. in
WEB-INF/classes)
struts.objectFactory = spring
struts.objectFactory.spring.autoWire = name
MG
-----Original Message-----
From: Frank Fischer [mailto:frank.fischer@digitalnomads.ch]
Sent: Monday, March 17, 2008 1:35 PM
To: 'Struts Users Mailing List'
Subject: RE: How to initialize business service objects?
Hi Michael
Thanks for your answer.
> 1) You have included the struts2-spring-pliugin.jar in your classpath
Yes, it put it under "WEB-INF/lib/" so it's packaged to the war file and
should be available to tomcat it think. I also can't see any error or
warning messages while deploying the application, so i guess the package
can
be resolved.
> 2) Your applicationContext.xml file is getting loaded on startup. If
> you haven't already done so, check your web.xml for a context
> parameter
> like this:
> <context-param>
> <param-name>contextConfigLocation</param-name>
>
> <param-value>classpath*:applicationContext*.xml</param-value>
> </context-param>
I did not include that line because i read, that this is the default
setting
Spring uses when no contextConfigLocation parameter is defined. I just
added
it but it didn't change anything as far as i see.
Thanks again for your help.
Frank
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RE: How to initialize business service objects?
Posted by Frank Fischer <fr...@digitalnomads.ch>.
Hi Michael
Thanks for your answer.
> 1) You have included the struts2-spring-pliugin.jar in your classpath
Yes, it put it under "WEB-INF/lib/" so it's packaged to the war file and
should be available to tomcat it think. I also can't see any error or
warning messages while deploying the application, so i guess the package can
be resolved.
> 2) Your applicationContext.xml file is getting loaded on startup. If
> you haven't already done so, check your web.xml for a context
> parameter
> like this:
> <context-param>
> <param-name>contextConfigLocation</param-name>
>
> <param-value>classpath*:applicationContext*.xml</param-value>
> </context-param>
I did not include that line because i read, that this is the default setting
Spring uses when no contextConfigLocation parameter is defined. I just added
it but it didn't change anything as far as i see.
Thanks again for your help.
Frank
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RE: How to initialize business service objects?
Posted by "Griffith, Michael *" <Mi...@fda.hhs.gov>.
Frank,
Check two things:
1) You have included the struts2-spring-pliugin.jar in your classpath
2) Your applicationContext.xml file is getting loaded on startup. If
you haven't already done so, check your web.xml for a context parameter
like this:
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath*:applicationContext*.xml</param-value>
</context-param>
HTH,
MG
-----Original Message-----
From: Frank Fischer [mailto:frank.fischer@digitalnomads.ch]
Sent: Monday, March 17, 2008 11:09 AM
To: 'Struts Users Mailing List'
Subject: RE: How to initialize business service objects?
Hi all
first i'd like to thank all of you that have given me valuable feedback
to
my question.
Following the answers from Dave and Jeromy i decided to go the "hard"
way
with Spring and DI. After reading some manuals (thanks to GF, good
reading)
i managed to load the Spring ContextLoaderListener and even define an
POJO
bean that serves as my BusinessLogicService. From the Tomcat logs i can
see
that an instance of that Service is created.
As far as i read/unterstood, i now would only have to create a setter
method
on my Action class and Spring then would automatically inject the
related
dependcy to my Action class. So far, this doesn't seem to work, so i
guess,
i must be missing something.
My applicationContext.xml looks quite simple (and seems to work, since
the
DispatcherService is created on startup):
-----------
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN"
"http://www.springframework.org/dtd/spring-beans.dtd">
<beans default-autowire="autodetect">
<bean id="DispatcherService"
class="com.demo.businesslogic.DispatcherService"/>
</beans>
-----------
The Struts config looks like:
-----------
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts
Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<package name="customerAgent" extends="struts-default">
<action name="login" method="login"
class="com.demo.CustomerAction">
<result name="input">/CustomerLogin.jsp</result>
<result name="success">/CustomerChat.jsp</result>
</action>
<action name="logout" method="logout"
class="com.demo.CustomerAction">
<result name="success">/CustomerLogin.jsp</result>
<result name="input">/CustomerLogin.jsp</result>
</action>
<action name="chat" method="chat"
class="com.demo.CustomerAction">
<result name="success">/CustomerChat.jsp</result>
</action>
</package>
</struts>
-----------
So i guess, i must be missing something. Is there a way i would have to
tell
Spring which Action classes to inject?
Thanks a lot for your help
Frank
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Re: Is type property in tag must be filled?
Posted by Antonio Petrelli <an...@gmail.com>.
2008/3/17, Chen Chunwei <ou...@cn.panasonic.com>:
>
> Thanks Antonio.
>
> I know little about DTD, but in my company, we are not allowed to access
> Internet. So I cann't see these dtds. :-(
WTF?
Now I know why you are still using Struts 1.1 :-D
You're forgiven :-D
Antonio
Re: Is type property in tag must be filled?
Posted by Chen Chunwei <ou...@cn.panasonic.com>.
Thanks Antonio.
I know little about DTD, but in my company, we are not allowed to access Internet. So I cann't see these dtds. :-(
Talos
----- Original Message -----
From: "Antonio Petrelli" <an...@gmail.com>
To: "Struts Users Mailing List" <us...@struts.apache.org>
Sent: Monday, March 17, 2008 4:32 PM
Subject: Re: Is type property in <form-bean /> tag must be filled?
> 2008/3/17, Chen Chunwei <ou...@cn.panasonic.com>:
>>
>> But I'm using Struts 1.1, then is it still required?
>
>
>
> Yes. See:
> http://struts.apache.org/dtds/struts-config_1_1.dtd
>
> And learn DTD :-)
>
> Antonio
>
Re: Is type property in tag must be filled?
Posted by Antonio Petrelli <an...@gmail.com>.
2008/3/17, Chen Chunwei <ou...@cn.panasonic.com>:
>
> But I'm using Struts 1.1, then is it still required?
Yes. See:
http://struts.apache.org/dtds/struts-config_1_1.dtd
And learn DTD :-)
Antonio
Re: Is type property in tag must be filled?
Posted by Chen Chunwei <ou...@cn.panasonic.com>.
Thanks Antonio
But I'm using Struts 1.1, then is it still required?
Talos
----- Original Message -----
From: "Antonio Petrelli" <an...@gmail.com>
To: "Struts Users Mailing List" <us...@struts.apache.org>
Sent: Monday, March 17, 2008 4:07 PM
Subject: Re: Is type property in <form-bean /> tag must be filled?
> 2008/3/17, Chen Chunwei <ou...@cn.panasonic.com>:
>> I'm new to Struts. And I want to ask if the type property in <form-bean /> tag must be filled? I mean if it's null, will the form-bean work?
>
> If you are using Struts 1.2.x, the "type" attribute is required:
> http://struts.apache.org/dtds/struts-config_1_2.dtd
>
> If you are using Struts 1.3.x, you must specify the "type" or the
> "extends" attribute.
>
> HTH
> Antonio
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
> For additional commands, e-mail: user-help@struts.apache.org
>
Re: Is type property in tag must be filled?
Posted by Antonio Petrelli <an...@gmail.com>.
2008/3/17, Chen Chunwei <ou...@cn.panasonic.com>:
> I'm new to Struts. And I want to ask if the type property in <form-bean /> tag must be filled? I mean if it's null, will the form-bean work?
If you are using Struts 1.2.x, the "type" attribute is required:
http://struts.apache.org/dtds/struts-config_1_2.dtd
If you are using Struts 1.3.x, you must specify the "type" or the
"extends" attribute.
HTH
Antonio
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Is type property in tag must be filled?
Posted by Chen Chunwei <ou...@cn.panasonic.com>.
Hi all,
I'm new to Struts. And I want to ask if the type property in <form-bean /> tag must be filled? I mean if it's null, will the form-bean work?
Thanks.
Talos
Re: How to initialize business service objects?
Posted by Dave Newton <ne...@yahoo.com>.
--- Randy Burgess <RB...@nuvox.com> wrote:
> You also need to setup your action in the application context so that
> Spring knows where to inject the business object.
You *can* do it that way, but the default setup doesn't require it. It
depends on how you're wiring, whether or not your philosophically opposed to
magic, and so on.
Dave
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Re: How to initialize business service objects?
Posted by Randy Burgess <RB...@nuvox.com>.
You also need to setup your action in the application context so that Spring
knows where to inject the business object. Your class name in the Struts
action also needs to be the *bean id of the action* so that the
Struts/Spring plugin can do it's work. So assuming you have a setter for
DispatcherService in CustomerAction your struts.xml would look like this.
> <struts>
>
> <package name="customerAgent" extends="struts-default">
>
> <action name="login" method="login" class="customerAction">
> <result name="input">/CustomerLogin.jsp</result>
> <result name="success">/CustomerChat.jsp</result>
> </action>
...
Application context:
...
<bean id="customerAction" class="com.demo.CustomerAction">
<property name="DispatcherService" ref="DispatcherService"/>
</bean
I recommend making your bean id's lower case and lower case properties in
the Action.
Private DispatcherService dispatcherService;
Then the property would be
<property name="dispatcherService" ref="dispatcherService"/>
Regards,
Randy Burgess
Sr. Web Applications Developer
Nuvox Communications
> From: Frank Fischer <fr...@digitalnomads.ch>
> Reply-To: Struts Users Mailing List <us...@struts.apache.org>
> Date: Mon, 17 Mar 2008 17:08:30 +0100
> To: 'Struts Users Mailing List' <us...@struts.apache.org>
> Subject: RE: How to initialize business service objects?
>
>
> Hi all
>
> first i'd like to thank all of you that have given me valuable feedback to
> my question.
>
> Following the answers from Dave and Jeromy i decided to go the "hard" way
> with Spring and DI. After reading some manuals (thanks to GF, good reading)
> i managed to load the Spring ContextLoaderListener and even define an POJO
> bean that serves as my BusinessLogicService. From the Tomcat logs i can see
> that an instance of that Service is created.
>
> As far as i read/unterstood, i now would only have to create a setter method
> on my Action class and Spring then would automatically inject the related
> dependcy to my Action class. So far, this doesn't seem to work, so i guess,
> i must be missing something.
>
> My applicationContext.xml looks quite simple (and seems to work, since the
> DispatcherService is created on startup):
>
> -----------
> <?xml version="1.0" encoding="UTF-8"?>
> <!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN"
> "http://www.springframework.org/dtd/spring-beans.dtd">
> <beans default-autowire="autodetect">
> <bean id="DispatcherService"
> class="com.demo.businesslogic.DispatcherService"/>
> </beans>
> -----------
>
> The Struts config looks like:
>
> -----------
> <?xml version="1.0" encoding="UTF-8" ?>
> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts
> Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd">
>
> <struts>
>
> <package name="customerAgent" extends="struts-default">
>
> <action name="login" method="login" class="com.demo.CustomerAction">
> <result name="input">/CustomerLogin.jsp</result>
> <result name="success">/CustomerChat.jsp</result>
> </action>
>
> <action name="logout" method="logout"
> class="com.demo.CustomerAction">
> <result name="success">/CustomerLogin.jsp</result>
> <result name="input">/CustomerLogin.jsp</result>
> </action>
>
> <action name="chat" method="chat" class="com.demo.CustomerAction">
> <result name="success">/CustomerChat.jsp</result>
> </action>
>
>
> </package>
>
> </struts>
> -----------
>
> So i guess, i must be missing something. Is there a way i would have to tell
> Spring which Action classes to inject?
>
> Thanks a lot for your help
> Frank
>
>
>
>
>
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RE: How to initialize business service objects?
Posted by Frank Fischer <fr...@digitalnomads.ch>.
Hi Dave
Hi all
Finally i got it working the "spring"-way, meaning, when also delegating the
instantiation of action classes to spring. The "default" way, meaning
letting struts2 creating the action instances still doesn't work and i
really don't understand why.
Thanks to everyone that help me getting it working!
For anybody having similar problems and reading this post some day in the
future in the archive:
- include spring.jar. Struts2-core.jar, struts2-spring-plugin.jar,
xwork.jar, ognl.jar, freemarker.jar and commons-logging.jar to your
/WEB-INF/lib dir.
- put web.xml under /WEB-INF.
- put applicationContex.xml somewehere to your classpath. Same for
struts.xml and if you need struts.properties (which is not needed as long as
you set the required params in the struts.xml. This mainly refers to the
setting of the object factory).
- You can use the default.properties from struts2-core.jar as template for
your own struts.properties (can by found unter org/apache/struts2/). Set
struts.objectFactory = spring and struts.objectFactory.spring.autoWire =
name.
- Your basic web.xml would look like:
----------------------------------------------------------------------------
-<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</liste
ner-class>
</listener>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath*:applicationContext*.xml</param-value>
</context-param>
</web-app>
----------------------------------------------------------------------------
-
- Your applicationContext.xml could look like this. Note that you first have
to define the business logic beans you later on need upon definition of the
action class beans. Also make sure you understand, that in struts.xml you
will have to define the action classes using their spring bean id and not
there class names! In this case the injection works by defining a
constructor argument. This could also be done using a setter method (than
you would pass a property argument).
----------------------------------------------------------------------------
-
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-2.0.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-2.0.xsd">
<bean id="businessService"
class="com.example.businesslogic.BusinessService" />
<bean id="someAction" scope="prototype" class="com.example.SomeAction">
<constructor-arg ref="businessService" />
</bean>
</beans>
----------------------------------------------------------------------------
-
- Your struts.properties would look like:
----------------------------------------------------------------------------
-
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts
Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<constant name="struts.objectFactory" value="spring" />
<constant name="struts.devMode" value="true" />
<package name="somePackageName" extends="struts-default">
<action name="login" method="login" class="someAction">
<result name="input">/login.jsp</result>
<result name="success">/mainapplication.jsp</result>
</action>
<action name="logout" method="logout" class="someAction">
<result name="success">/login.jsp</result>
</action>
</package>
</struts>
----------------------------------------------------------------------------
-
I hope there's nothing wrong i wrote. Ohterwise plz feel free to
correct/comment.
Frank
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RE: How to initialize business service objects?
Posted by Dave Newton <ne...@yahoo.com>.
--- Frank Fischer <fr...@digitalnomads.ch> wrote:
> <beans default-autowire="autodetect">
Off the top of my head I don't recall what "autodetect" means.
Did you try leaving out the "default-autowire" attribute or switching it to
the default ("name" or something like that; I don't recall) and seeing if
that works?
That would at least help determine if everything is getting
deployed/initialized correctly.
Dave
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RE: How to initialize business service objects?
Posted by Frank Fischer <fr...@digitalnomads.ch>.
Hi all
first i'd like to thank all of you that have given me valuable feedback to
my question.
Following the answers from Dave and Jeromy i decided to go the "hard" way
with Spring and DI. After reading some manuals (thanks to GF, good reading)
i managed to load the Spring ContextLoaderListener and even define an POJO
bean that serves as my BusinessLogicService. From the Tomcat logs i can see
that an instance of that Service is created.
As far as i read/unterstood, i now would only have to create a setter method
on my Action class and Spring then would automatically inject the related
dependcy to my Action class. So far, this doesn't seem to work, so i guess,
i must be missing something.
My applicationContext.xml looks quite simple (and seems to work, since the
DispatcherService is created on startup):
-----------
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN"
"http://www.springframework.org/dtd/spring-beans.dtd">
<beans default-autowire="autodetect">
<bean id="DispatcherService"
class="com.demo.businesslogic.DispatcherService"/>
</beans>
-----------
The Struts config looks like:
-----------
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts
Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<package name="customerAgent" extends="struts-default">
<action name="login" method="login" class="com.demo.CustomerAction">
<result name="input">/CustomerLogin.jsp</result>
<result name="success">/CustomerChat.jsp</result>
</action>
<action name="logout" method="logout"
class="com.demo.CustomerAction">
<result name="success">/CustomerLogin.jsp</result>
<result name="input">/CustomerLogin.jsp</result>
</action>
<action name="chat" method="chat" class="com.demo.CustomerAction">
<result name="success">/CustomerChat.jsp</result>
</action>
</package>
</struts>
-----------
So i guess, i must be missing something. Is there a way i would have to tell
Spring which Action classes to inject?
Thanks a lot for your help
Frank
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Re: How to initialize business service objects?
Posted by GF <ga...@gmail.com>.
I suggest you to read this simple but useful tutorial to have an idea about
how much is simple to use Struts2+Spring+Hibernate together.
http://struts.apache.org/2.x/docs/struts-2-spring-2-jpa-ajax.html
On Thu, Mar 13, 2008 at 10:32 PM, Frank Fischer <
frank.fischer@digitalnomads.ch> wrote:
>
> Now i don't understand (1) where to create/initialize these business logic
> classes and (2) how to get access to them from the action classes.
>
Re: How to initialize business service objects?
Posted by Jeromy Evans <je...@blueskyminds.com.au>.
Hi Frank,
Have a read of Martin Fowler's article on deciding which option best
suits you:
http://martinfowler.com/articles/injection.html
As Dave described you have many possibilities, but the common techniques
are (not in order of preference):
a. Use a ServletContextListener to to setup your services and place
them in Application Scope. Look them up from your action
b. as per b, but include an interceptor to inject them into your
actions based on interfaces (eg.MyServiceAware)
c. Setup your business services as Singletons or accessed through a
Registry (setup as per a)
d. Use an IOC container. Spring and Guice. Guice is simple, elegant
and does this single task extremely well; Spring knowledge is a
must-have and reflects the community's consensus on best-practice in
almost every imaginable aspect of a web application.
Hope that helps.
Jeromy Evans
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[OT] RE: How to initialize business service objects?
Posted by Dave Newton <ne...@yahoo.com>.
--- Frank Fischer <fr...@digitalnomads.ch> wrote:
> I just read a bit regarding Spring. As far as i understand its focus is on
> J2EE appllications. I guess for what i want to do in a first step (my
> simple chat app) it would be overkill to use Spring. Do i get that right?
Not really.
IMO Spring is a light-weight(-ish) alternative to "true" JEE apps (note that
it's JEE now, not J2EE :)
S2's Spring integration is lightweight to the point of near-invisibility,
particularly for simple setups. It's as easy as defining a bean in a Spring
configuration file and providing a setter in your S2 action. There are
several benefits to doing so, but that's something you can discover on your
own if you decide to explore Spring. This particular usage is called
"Inversion of Control" (IoC) or (my preference) "Dependency Injection" (DI).
> I just don't understand how can i get access to a BusinessServiceObject
> created in one of my Action classes from another Action class. Just by
> declaring it as static?
No, by keeping it in session or application scope.
I'd recommend getting at least a minimal handle on some basic web application
technology and terminology before jumping in *too* deep: S2, like many
frameworks, pretty much requires a basic understanding of the fundamentals.
Without it it's hard to even know what questions to ask sometimes, and will
make the whole process much easier.
> Second thing i don't understand is, when will action objects be intatiated
> in the application server?
Actions are instantiated per-request.
> As far as i remember from the early days of
> servlet programming (when i had to do with this technology the last time)
> the servlets are intantiated upon the first request. In a normal Servlet
> based Web app i would have intiantiated BusinessServiceObjects in a filter
> and placed them to the ServletContext. So i could be sure it's instantiated
> before the first request arrives and i can get a reference to it from
> anywhere in my web app. But with Struts i don't see how i could do so.
You *could* do it the exact same way: S2 doesn't replace what you know about
web applications, it supplements it.
That said, it's probably better to perform tasks like that in
ServletContextListener (don't quote me on that; I have a notoriously bad
memory for anything camelCased) or whatever it's called.
Dave
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RE: How to initialize business service objects?
Posted by Frank Fischer <fr...@digitalnomads.ch>.
Hi Randy
Hi all
I just read a bit regarding Spring. As far as i understand its focus is on
J2EE appllications. I guess for what i want to do in a first step (my simple
chat app) it would be overkill to use Spring. Do i get that right?
I would prefere to go the most simple way if possible. So, just
instantiating my BusinessServiceObject the common way would be fine for me.
I just don't understand how can i get access to a BusinessServiceObject
created in one of my Action classes from another Action class. Just by
declaring it as static?
Second thing i don't understand is, when will action objects be intatiated
in the application server? As far as i remember from the early days of
servlet programming (when i had to do with this technology the last time)
the servlets are intantiated upon the first request. In a normal Servlet
based Web app i would have intiantiated BusinessServiceObjects in a filter
and placed them to the ServletContext. So i could be sure it's instantiated
before the first request arrives and i can get a reference to it from
anywhere in my web app. But with Struts i don't see how i could do so.
I know this might sound a little bit confused. Can you help me to get on
track again?
Thanks for your help
Frank
> -----Original Message-----
> From: Randy Burgess [mailto:RBurgess@nuvox.com]
> Sent: Thursday, March 13, 2008 11:02 PM
> To: Struts Users Mailing List
> Subject: Re: How to initialize business service objects?
>
> For a POJO you can use dependency injection such as Spring or
> Guice or you
> can instantiate the object the normal way
>
> BusinessServiceObject bso = new BusinessServiceObject();
>
> in your action class. There is nothing special about
> accessing your BSO's in
> Struts.
>
> Regards,
> Randy Burgess
> Sr. Web Applications Developer
> Nuvox Communications
>
>
>
> > From: Frank Fischer <fr...@digitalnomads.ch>
> > Reply-To: Struts Users Mailing List <us...@struts.apache.org>
> > Date: Thu, 13 Mar 2008 22:32:34 +0100
> > To: <us...@struts.apache.org>
> > Subject: How to initialize business service objects?
> >
> > Hi all
> >
> > i'm just starting with struts2 (even with struts at all).
> Of course i first
> > read some how-to-starts. But there is one thing i don't understand.
> >
> > I'm trying to create a simple little chat app. I have two
> action classes,
> > one for the normal chat user, one for the moderators. Both
> classes need
> > access to the same instances of business service classes
> which mainly hold
> > runtime data such as a list of users currently logged in,
> list of chat rooms
> > and so on.
> >
> > Now i don't understand (1) where to create/initialize these
> business logic
> > classes and (2) how to get access to them from the action classes.
> >
> > I'm very thankful for any hint.
> >
> > Thanks a lot
> > Frank
>
>
>
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Re: How to initialize business service objects?
Posted by Randy Burgess <RB...@nuvox.com>.
For a POJO you can use dependency injection such as Spring or Guice or you
can instantiate the object the normal way
BusinessServiceObject bso = new BusinessServiceObject();
in your action class. There is nothing special about accessing your BSO's in
Struts.
Regards,
Randy Burgess
Sr. Web Applications Developer
Nuvox Communications
> From: Frank Fischer <fr...@digitalnomads.ch>
> Reply-To: Struts Users Mailing List <us...@struts.apache.org>
> Date: Thu, 13 Mar 2008 22:32:34 +0100
> To: <us...@struts.apache.org>
> Subject: How to initialize business service objects?
>
> Hi all
>
> i'm just starting with struts2 (even with struts at all). Of course i first
> read some how-to-starts. But there is one thing i don't understand.
>
> I'm trying to create a simple little chat app. I have two action classes,
> one for the normal chat user, one for the moderators. Both classes need
> access to the same instances of business service classes which mainly hold
> runtime data such as a list of users currently logged in, list of chat rooms
> and so on.
>
> Now i don't understand (1) where to create/initialize these business logic
> classes and (2) how to get access to them from the action classes.
>
> I'm very thankful for any hint.
>
> Thanks a lot
> Frank
This email and any attachments ("Message") may contain legally privileged and/or confidential information. If you are not the addressee, or if this Message has been addressed to you in error, you are not authorized to read, copy, or distribute it, and we ask that you please delete it (including all copies) and notify the sender by return email. Delivery of this Message to any person other than the intended recipient(s) shall not be deemed a waiver of confidentiality and/or a privilege.
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