Home.... | log in.... | Pub my question! | Sign-up....

Java-index >> Other Topics >> Patterns & OO Design

How to access a ejb from a bean

I need to acces a ejb from a bean, working with iplanet, but I cant open the home object. An NoClassDefFoundError happen.

there is the code:

String JNDIFormulari = "java:comp/env/Formulari";

Object BOFormulari = null;

com.base.formulari.FormulariHome HomeFormulari;

com.base.formulari.Formulari RemoteFormulari;

InitialContext ctx = new InitialContext();

BOFormulari = ctx.lookup(JNDIFormulari);

HomeFormulari = (com.base.formulari.FormulariHome) BOFormulari; <<The thing brokes here!!!

[564 byte] By [JPons] at [2007-9-26 4:36:31]

«« How to access a ejb from a bean
»» Database access from session bean

# 1

> HomeFormulari = (com.base.formulari.FormulariHome)

> BOFormulari; <<The thing brokes here!!!

I think you have to "narrow" the object before you cast it into a HomeFormulari obejct, like so :

HomeFormulari = (com.base.formulari.FormulariHome) javax.rmi.PortableRemoteObject.narrow(BOFormulari, com.base.formulari.FormulariHome.class);

Not entirly sure what the history behind having to narrow is (something to do with CORBA, I think !), but I've just been told it is neccassary to do it !

Hopefully this will help, even if it doesn't solve the probelm, I think narrowing is sitll neccassary.

Cheers,

Ben Turner

bdturne at 2007-6-29 17:54:36 >

top of Java-index,Other Topics,Patterns & OO Design...

# 2

Hi,

Try this :

import com.base.formulari.*;

String name = "java:comp/env/Formulari";

FormulariHome home;

Formulari remote;

InitialContext ctx = new InitialContext();

Object obj = ctx.lookup(name);

home = (FormulariHome)javax.rmi.PortableRemoteObject.narrow(obj, FormulariHome.class);

remote = home.create()....

Good Luck,

Adi.

adibaron at 2007-6-29 17:54:36 >

# 3

Thanks, but now I narrow the object, but the error is the same.I need more ideas, please!!!!

JPons at 2007-6-29 17:54:36 >

# 4

1. It would help if you attached the error.2. What kind of a server are you working with (where are the EJBs deployed)?3. It doesn't matter , but anyway, are you looking for an Entity or a Session Bean?

adibaron at 2007-6-29 17:54:36 >

# 5

adibaron at 2007-6-29 17:54:36 >

# 6

> 1. It would help if you attached the error.

Here is the error.

-This is what appear in the Web browser:

Error: 500 SC_INTERNAL_SERVER_ERROR

java.lang.NoClassDefFoundError

-And this is what appear in the KJS log file(is a little long)

[22/Aug/2001 11:45:14:3] error: Exception: SERVLET-run_failed: Failed in running template: /Prova11/prova1.jsp, java.lang.NoClassDefFoundError: com.base.formulari.FormulariHome

Exception Stack Trace:

java.lang.NoClassDefFoundError: com.base.formulari.FormulariHome

at java.lang.Throwable.fillInStackTrace(Native Method)

at java.lang.Throwable.fillInStackTrace(Compiled Code)

at java.lang.Throwable.<init>(Compiled Code)

at java.lang.Error.<init>(Error.java:50)

at java.lang.LinkageError.<init>(LinkageError.java:43)

at java.lang.NoClassDefFoundError.<init>(NoClassDefFoundError.java:47)

at provem.prova.class$(prova.java:18)

at provem.prova.hola(prova.java:66)

at jsp.APPS.Prova11.prova1._jspService(prova1.java:67)

at jsp.APPS.Prova11.prova1.service(prova1.java:35)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:865)

at com.netscape.server.servlet.servletrunner.ServletInfo.service(Unknown Source)

at com.netscape.server.servlet.servletrunner.ServletRunner.callJSP(Unknown Source)

at com.netscape.server.servlet.platformhttp.PlatformHttpServletResponse.callJspCompiler(Unknown Source)

at com.netscape.server.servlet.platformhttp.PlatformHttpServletResponse.callUri(Unknown Source)

at com.netscape.server.servlet.platformhttp.PlatformHttpServletResponse.callUriRestrictOutput(Unknown Source)

at com.netscape.server.servlet.platformhttp.PlatformRequestDispatcher.forward(Unknown Source)

at com.netscape.server.servlet.jsp.JSPRunner.service(Unknown Source)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:865)

at com.netscape.server.servlet.servletrunner.ServletInfo.service(Unknown Source)

at com.netscape.server.servlet.servletrunner.ServletRunner.execute(Unknown Source)

at com.kivasoft.applogic.AppLogic.execute(Compiled Code)

at com.kivasoft.thread.ThreadBasic.run(Native Method)

at com.kivasoft.thread.ThreadBasic.run(Compiled Code)

at java.lang.Thread.run(Compiled Code)

[22/Aug/2001 11:45:14:3] error: Exception: SERVLET-run_failed: Failed in running template: [App = Prova11, Servlet = XXXMagicJspCompileServlet], java.lang.ClassCastException: java.lang.NoClassDefFoundError

Exception Stack Trace:

java.lang.ClassCastException: java.lang.NoClassDefFoundError