JNDI lookup returns $Proxy object

[peafunk]

Hi,

I am having an issue configuring a datasource with JBoss. When I perform a lookup of the datasource from outside of the web application, it returns a $Proxy# object instead of a javax.sql.DataSource object. I've scoured the forums here and tried to resolve this myself but haven't been able to. The most popular cause of the problem seems to be that a different classloader is being used to retrieve the object from JNDI but I'm not sure how that is happening or how to fix it. I am using the exact same classpath and have included in the classpath the jbossall-client.jar from the jboss/client directory. I also setup the datasource in the Global JNDI Namespace, not the java: namespace. Has anyone else experienced this or know what I might be doing wrong? I can post all the code if need be. Thanks in advance for any help.

[javidjamae]

Stupid question, but have you tried casting it to a DataSource? If you are getting a ClassCastException when you try to do a JNDI lookup, it is usually a classpath issue. Try including all of the JARs from the client directory in your classpath and remove any J2EE jars that weren't distributed with the version of JBoss that you're using.

[peafunk]

Thanks for getting back to me. I finally figured this out, it was what you mentioned. I had to remove all other J2EE jar files and include jboss-j2ee.jar in the classpath. The problem was I had two different versions of javax.sql.DataSource in the classpath.

Thanks for the help!

[javidjamae]

Another cause that I've seen is when you try to cast the return value of the JNDI lookup on an EJB to the bean type rather than the interface type.

//This works
GreeterRemote myGreeter = (GreeterRemote) ctx.lookup("GreeterBean/remote");

// This doesn't work (throws "ClassCastException: $Proxy0")
GreeterBean myGreeter = (GreeterBean) ctx.lookup("GreeterBean/remote");

Of course, you shouldn't be doing the second one, because the client should only be dealing with the remote interface.