JNDI Name for EJB3

[Juergen Weber]

Hi,

I ran again into the problem of looking up an EJB3 from JNDI in a JSP (Ger 2.1.4)

The bean is

@Stateless(name="Secure3")
public class Secured3Bean implements Secured3

Deployment log says
2009-06-17 17:31:22,989 INFO  [startup] Assembling app: /projekte/geronimo-jetty6-javaee5-2.1.4/var/temp/geronimo-deployer4457332012373548807.tmpdir/Secured3Bean_ejb.jar
2009-06-17 17:31:22,993 INFO  [startup] Jndi(name=Secure3Remote) --> Ejb(deployment-id=Secured3Bean/Secure3)

So I guess JNDI name is Secure3Remote.
but context.lookup("java:comp/env/Secure3Remote") throws an exeption, also context.lookup("Secure3Remote") and all other permutations I could think of.

http://cwiki.apache.org/GMOxDEV/client-jndi-names.html did not help.

Could someone please give a hint what name I should try.

Thanks,
Juergen

[djencks]

On Jun 17, 2009, at 8:43 AM, Juergen Weber wrote:

>
> Hi,
>
> I ran again into the problem of looking up an EJB3 from JNDI in a  
> JSP (Ger
> 2.1.4)
>
> The bean is
>
> @Stateless(name="Secure3")
> public class Secured3Bean implements Secured3
>
> Deployment log says
> 2009-06-17 17:31:22,989 INFO  [startup] Assembling app:
> /projekte/geronimo-jetty6-javaee5-2.1.4/var/temp/geronimo-
> deployer4457332012373548807.tmpdir/Secured3Bean_ejb.jar
> 2009-06-17 17:31:22,993 INFO  [startup] Jndi(name=Secure3Remote) -->
> Ejb(deployment-id=Secured3Bean/Secure3)
>
> So I guess JNDI name is Secure3Remote.
> but context.lookup("java:comp/env/Secure3Remote") throws an  
> exeption, also
> context.lookup("Secure3Remote") and all other permutations I could  
> think of.
>
> http://cwiki.apache.org/GMOxDEV/client-jndi-names.html did not help.
>
> Could someone please give a hint what name I should try.

For phiosophical reasons I would not recommend using an ejb directly  
from a jsp, rather I'd suggest a servlet that constructs an easily  
rendered data model; in the servlet you can use annotations.

If you use a jsp you need to mention the ejb-ref in your web.xml and  
that should give you the name to look up.

thanks
david jencks

>
> Thanks,
> Juergen
>
> --
> View this message in context: http://www.nabble.com/JNDI-Name-for-EJB3-tp24076429s134p24076429.html
> Sent from the Apache Geronimo - Users mailing list archive at  
> Nabble.com.
>

[Rodger]

http://cwiki.apache.org/GMOxDEV/client-jndi-names.html will use a RemoteInitialContextFactory.
Like:
        Properties p = new Properties();
        p.setProperty(Context.INITIAL_CONTEXT_FACTORY, "org.apache.openejb.client.RemoteInitialContextFactory");
        p.setProperty(Context.PROVIDER_URL, "ejbd://localhost:4201");
        Context initialContext=null;
        try {
            initialContext=new InitialContext(p);
                       
            Object object1 = initialContext.lookup("Secure3Remote");
            Secure3Remote s3r=(Secure3Remote)object1;
           
        } catch (NamingException e) {
            e.printStackTrace();
        }
--
Best Regards,
Rodger.

[Rodger]

And <geronimo_home>/repository/org/apache/openejb/openejb-client/3.0.1/openejb-client-3.0.1.jar is necessary.

2009/6/18 Rodger <eternaljian@...>

http://cwiki.apache.org/GMOxDEV/client-jndi-names.html will use a RemoteInitialContextFactory.
Like:
        Properties p = new Properties();
        p.setProperty(Context.INITIAL_CONTEXT_FACTORY, "org.apache.openejb.client.RemoteInitialContextFactory");
        p.setProperty(Context.PROVIDER_URL, "ejbd://localhost:4201");
        Context initialContext=null;
        try {
            initialContext=new InitialContext(p);
                       
            Object object1 = initialContext.lookup("Secure3Remote");
            Secure3Remote s3r=(Secure3Remote)object1;
           
        } catch (NamingException e) {
            e.printStackTrace();
        }
--
Best Regards,
Rodger.

--
Best Regards,
Rodger.

[djencks]

That may go over tcp/ip rather than in-vm.  The jndi names are printed out in var/log/geronimo.log as the ejbs start.

You can also use the in-vm javaee jndi context if you set it up with ejb refs in web.xml.

david jencks

On Jun 17, 2009, at 6:17 PM, Rodger wrote:

And <geronimo_home>/repository/org/apache/openejb/openejb-client/3.0.1/openejb-client-3.0.1.jar is necessary.

2009/6/18 Rodger <eternaljian@...>

http://cwiki.apache.org/GMOxDEV/client-jndi-names.html will use a RemoteInitialContextFactory.
Like:
        Properties p = new Properties();
        p.setProperty(Context.INITIAL_CONTEXT_FACTORY, "org.apache.openejb.client.RemoteInitialContextFactory");
        p.setProperty(Context.PROVIDER_URL, "ejbd://localhost:4201");
        Context initialContext=null;
        try {
            initialContext=new InitialContext(p);
                       
            Object object1 = initialContext.lookup("Secure3Remote");
            Secure3Remote s3r=(Secure3Remote)object1;
           
        } catch (NamingException e) {
            e.printStackTrace();
        }
--
Best Regards,
Rodger.

--
Best Regards,
Rodger.

[Juergen Weber]

Rodger, thanks you, that works.

8-)
Juergen

Rodger wrote:

http://cwiki.apache.org/GMOxDEV/client-jndi-names.html will use a
RemoteInitialContextFactory.
Like:
        Properties p = new Properties();
        p.setProperty(Context.INITIAL_CONTEXT_FACTORY,
"org.apache.openejb.client.RemoteInitialContextFactory");
        p.setProperty(Context.PROVIDER_URL, "ejbd://localhost:4201");
        Context initialContext=null;
        try {
            initialContext=new InitialContext(p);

            Object object1 = initialContext.lookup("Secure3Remote");
            Secure3Remote s3r=(Secure3Remote)object1;

        } catch (NamingException e) {
            e.printStackTrace();
        }
--
Best Regards,
Rodger.

[Juergen Weber]

I only wanted to try some security thing (which will be my next post ;-), so I used a JSP for a quick test (which took rather long ;-)

I had had just a glance at http://cwiki.apache.org/GMOxDOC21/mytime-very-simple-session-ejb-example.html
and there is neither web.xml nor ejb-ref.

My original Exception without ejb-ref was

javax.naming.NotContextException: ejb/Secured3Bean
        at org.apache.xbean.naming.context.AbstractContext.lookup(AbstractContext.java:171)
        at org.apache.xbean.naming.context.AbstractContext.lookup(AbstractContext.java:611)
        at javax.naming.InitialContext.lookup(InitialContext.java:392)

I think this Exception is misleading, there should be a message like "ejb-ref" is missing.
Throwing a NotContextException in this case is like if you are searching something in a database and throwing an EntryNotFoundException when the database is down.

On your suggestion I tried

  <ejb-local-ref>
         <ejb-ref-name>ejb/Secured3</ejb-ref-name>
         <ejb-ref-type>Session</ejb-ref-type>
         <local>ejb3.Secured3</local>
         <ejb-link>Secure3</ejb-link>
      </ejb-local-ref>

but this gives the exception below.

Thanks,
Juergen


java.lang.NullPointerException
        at org.apache.openejb.util.LinkResolver.resolveLink(LinkResolver.java:69)
        at org.apache.openejb.assembler.classic.EjbResolver.resolveLink(EjbResolver.java:121)
        at org.apache.openejb.assembler.classic.EjbResolver.resolve(EjbResolver.java:180)
        at org.apache.openejb.config.JndiEncInfoBuilder.buildEjbRefs(JndiEncInfoBuilder.java:172)
        at org.apache.openejb.config.JndiEncInfoBuilder.build(JndiEncInfoBuilder.java:129)
        at org.apache.geronimo.openejb.deployment.EjbRefBuilder.buildNaming(EjbRefBuilder.java:153)
        at org.apache.geronimo.j2ee.deployment.NamingBuilderCollection.buildNaming(NamingBuilderCollection.java:53)
        at org.apache.geronimo.web25.deployment.AbstractWebModuleBuilder.configureBasicWebModuleAttributes(AbstractWebModuleBuilder.java:842)
        at org.apache.geronimo.jetty6.deployment.JettyModuleBuilder.addGBeans(JettyModuleBuilder.java:365)
        at org.apache.geronimo.j2ee.deployment.SwitchingModuleBuilder.addGBeans(SwitchingModuleBuilder.java:165)
        at org.apache.geronimo.j2ee.deployment.EARConfigBuilder.buildConfiguration(EARConfigBuilder.java:647)
        at org.apache.geronimo.deployment.Deployer.deploy(Deployer.java:255)
        at org.apache.geronimo.deployment.Deployer.deploy(Deployer.java:134)
        at sun.reflect.GeneratedMethodAccessor496.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.apache.geronimo.gbean.runtime.ReflectionMethodInvoker.invoke(ReflectionMethodInvoker.java:34)
        at org.apache.geronimo.gbean.runtime.GBeanOperation.invoke(GBeanOperation.java:124)
        at org.apache.geronimo.gbean.runtime.GBeanInstance.invoke(GBeanInstance.java:867)
        at org.apache.geronimo.kernel.basic.BasicKernel.invoke(BasicKernel.java:239)
        at org.apache.geronimo.deployment.plugin.local.AbstractDeployCommand.doDeploy(AbstractDeployCommand.java:116)
        at org.apache.geronimo.deployment.plugin.local.RedeployCommand.redeploySameConfiguration(RedeployCommand.java:225)
        at org.apache.geronimo.deployment.plugin.local.RedeployCommand.run(RedeployCommand.java:101)
        at java.lang.Thread.run(Thread.java:619)
 

djencks wrote:

On Jun 17, 2009, at 8:43 AM, Juergen Weber wrote:

>
> Hi,
>
> I ran again into the problem of looking up an EJB3 from JNDI in a  
> JSP (Ger
> 2.1.4)
>
> The bean is
>
> @Stateless(name="Secure3")
> public class Secured3Bean implements Secured3
>
> Deployment log says
> 2009-06-17 17:31:22,989 INFO  [startup] Assembling app:
> /projekte/geronimo-jetty6-javaee5-2.1.4/var/temp/geronimo-
> deployer4457332012373548807.tmpdir/Secured3Bean_ejb.jar
> 2009-06-17 17:31:22,993 INFO  [startup] Jndi(name=Secure3Remote) -->
> Ejb(deployment-id=Secured3Bean/Secure3)
>
> So I guess JNDI name is Secure3Remote.
> but context.lookup("java:comp/env/Secure3Remote") throws an  
> exeption, also
> context.lookup("Secure3Remote") and all other permutations I could  
> think of.
>
> http://cwiki.apache.org/GMOxDEV/client-jndi-names.html did not help.
>
> Could someone please give a hint what name I should try.

For phiosophical reasons I would not recommend using an ejb directly  
from a jsp, rather I'd suggest a servlet that constructs an easily  
rendered data model; in the servlet you can use annotations.

If you use a jsp you need to mention the ejb-ref in your web.xml and  
that should give you the name to look up.

thanks
david jencks

>
> Thanks,
> Juergen
>
> --
> View this message in context: http://www.nabble.com/JNDI-Name-for-EJB3-tp24076429s134p24076429.html
> Sent from the Apache Geronimo - Users mailing list archive at  
> Nabble.com.
>

[Juergen Weber]

OK, I got it to run with <ejb-local-ref> using the sample from
http://cwiki.apache.org/GMOxDOC20/very-simple-session-ejb-example.html

(which does contain a web.xml)

        <ejb-local-ref>
                <ejb-ref-name>ejb/Secured3</ejb-ref-name>
                <ejb-ref-type>Session</ejb-ref-type>
                <local>ejb3.Secured3</local>
        </ejb-local-ref>

context = new InitialContext();
Secured3 secured3 = (Secured3) context.lookup("java:comp/env/ejb/Secured3");

I also needed a sys:dependency from geronimo-web.xml to openejb-jar.xml to make the remote interface known to the JSP (this is missing in the above sample).
First I simply included the ejb.jar into WEB-INF/lib, but this results in ClassCastException on JNDI lookup (I guess because the Remote interface in JNDI is from a different (the ejb) classloader than the cast target which is from the web application).

Thanks,
Juergen

[Rex Wang-2]

hi Juergen,

Here is my note..
EJB Project=================================================

@Remote
interface Converter

@stateless
public class ConverterBean implements Converter


Web Project=================================================

1 Add dependency in geronimo-web.xml
    <sys:dependency>
        <sys:groupId>default</sys:groupId>
        <sys:artifactId>CurrencyConvertEJB</sys:artifactId>
        <sys:version>1.0</sys:version>
        <sys:type>car</sys:type>
    </sys:dependency>

2 Ref the EJB
(1) Method 1
in web.xml--------------
    <ejb-ref>
        <ejb-ref-name>ConverterBean</ejb-ref-name>   <!--actually Convert, ConvertBeanRemote are also ok-->
        <ejb-ref-type>Session</ejb-ref-type>
        <remote>ejb.Converter</remote>
    </ejb-ref>


in jsp------------------
    <%@ page import="javax.naming.*" %>
    <%@ page import="ejb.Converter" %>
    <%
    Context ctx = new InitialContext();
    Converter ref = (Converter)ctx.lookup("java:comp/env/ConverterBean");
    %>


(2) Method 2
in geronimo-web.xml-------
    <name:ejb-ref>
        <name:ref-name>ejb/SessionBean</name:ref-name>
        <name:ejb-link>ConverterBean</name:ejb-link>
    </name:ejb-ref>

in web.xml----------------
    <ejb-ref>
        <ejb-ref-name>ejb/SessionBean</ejb-ref-name>
        <ejb-ref-type>Session</ejb-ref-type>
        <remote>ejb.Converter</remote>
    </ejb-ref>

in jsp--------------------
    <%@ page import="javax.naming.*" %>
    <%@ page import="ejb.Converter" %>
    <%
    Context ctx = new InitialContext();
    Converter ref = (Converter)ctx.lookup("java:comp/env/ejb/SessionBean");
    %>


 

   


HTH.

Rex

2009/6/18 Juergen Weber <weberjn@...>

OK, I got it to run with <ejb-local-ref> using the sample from
http://cwiki.apache.org/GMOxDOC20/very-simple-session-ejb-example.html

(which does contain a web.xml)

       <ejb-local-ref>
               <ejb-ref-name>ejb/Secured3</ejb-ref-name>
               <ejb-ref-type>Session</ejb-ref-type>
               <local>ejb3.Secured3</local>

       </ejb-local-ref>

context = new InitialContext();
Secured3 secured3 = (Secured3) context.lookup("java:comp/env/ejb/Secured3");

I also needed a sys:dependency from geronimo-web.xml to openejb-jar.xml to
make the remote interface known to the JSP (this is missing in the above
sample).
First I simply included the ejb.jar into WEB-INF/lib, but this results in
ClassCastException on JNDI lookup (I guess because the Remote interface in
JNDI is from a different (the ejb) classloader than the cast target which is
from the web application).

Thanks,
Juergen


--
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