Run the example of ejb tutorial ...

Question

When I run the example of "Enterprise JavaBeansTM Tutorial:
Building Your First Stateless Session Bean"--DemoClient,(Weblogic server 6.0,
win 2000) ,I met a probelm.
Following is the error information:
C:\bea\wlserver6.0\CLASSES>java -Djava.naming.factory.initial=weblogic.jndi.Teng
ahInitialContextFactory -Djava.naming.provider.url=t3://localhost:7001 ejb.demo.
DemoClient
begin DemoClient...
=> Error <=
javax.naming.NoInitialContextException: Cannot instantiate class: weglogic.jndi.
T3InitialContextFactory. Root exception is java.lang.ClassNotFoundException: we
glogic.jndi.T3InitialContextFactory
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:297)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:286)
at java.lang.ClassLoader.loadClass(ClassLoader.java:253)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:313)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:195)
at com.sun.naming.internal.VersionHelper12.loadClass(VersionHelper12.jav
a:45)
at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:6
55)
at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:246
at javax.naming.InitialContext.init(InitialContext.java:222)
at javax.naming.InitialContext.<init>(InitialContext.java:198)
at ejb.demo.DemoClient.getInitialContext(DemoClient.java:58)
at ejb.demo.DemoClient.main(DemoClient.java:15)
End DemoClient...
Any guidance will be appreciated!
Thanks, Yu

Answer 1

I managed to fix my problem, hopefully thissolution
will help you as well.
I discovered that the following entries arerequired
in the jndi.properties file in order to lookupEJB's
using JNDI from a client application:
java.naming.factory.initial=com.sun.jndi.cosnaming.CNCt
Factory
java.naming.provider.url=iiop://localhost:1050
Note that my environment uses the j2ee server fromSUN
running on the localhost on port 1050.
If you can locate the proper settings for theweblogic
server, then you can try this solution on for size.
One quick question: When I try to run my client
against the Ref. Implementation like this:
java -Dorg.omg.CORBA.ORBInitialHost=localhost
-Dorg.omg.CORBA.ORBInitialPort=1050
-Djava.naming.factory.initial=com.sun.jndi.cosnaming.CN
txFactory
-Djava.naming.provider.url=iiop://localhost:1050
com.sld.role.ValidationClient
I get the following error:
javax.naming.NamingException: java:comp/env namespace
is only available from within a J2EE component.
This stinks. All I can find out is that Sun wants you
to use runclient, which is silly. My client is trying
to resolve the JNDI name:
"java:comp/env/ejb/ValidationSessionBean"
Any idea why this isn't working?
Thanks....
-ScottGot it working. Here's how:
In the client's CLASSPATH I have three things: j2ee.jar, the client jar file generated by the server during deployment, and my client class files. I took out all of the -D stuff above and it still works. (With or without it.) I haven't tried it from another machine yet - I may need them for that.
The client uses the JNDI name "ValidationSessionBean", not "java:comp/env/ejb/ValidationSessionBean" and it now can bind to it.
I wish Sun would have given out this kind of info with their J2EE tutorial, instead of just pushing their runclient script, which uses their own client class.
-Scott