ClassCastException at Remote object although remote interface is implemented
Hi,
I want to access a remote object via T3 (on WebLogic 10) but I am
getting a ClassCastException in the client. The exception is thrown if
the generic "Remote" object is casted into a concrete remote interface.
The following works ok (client side, get remote object via JNDI):
Hashtable hashTable = new Hashtable();
hashTable.put(Context.INITIAL_CONTEXT_FACTORY,
"weblogic.jndi.WLInitialContextFactory");
hashTable.put(Context.PROVIDER_URL, "t3://localhost:7001);
ic = new InitialContext(hashTable);
Remote r = (Remote) ic.lookup("...jndi bind name...");
But this cast fails:
IMyRemoteIntf i = (IMintRemoteIntf) r;
The ClassCastException has the classname of the class which implements
the remote interface - the lookup should be ok therefore. With
r.getClass().getInterfaces() I have verified that the remote object
actually implements the appropriate interface. I suppose it is a class
loader issue then and added some debug output.
Class loader parent chain of IMyRemoteIntf:
weblogic.utils.classloaders.ChangeAwareClassLoader@1715ee2
-> weblogic.utils.classloaders.GenericClassLoader@123ade0
-> weblogic.utils.classloaders.FilteringClassLoader@1312cf9
-> weblogic.utils.classloaders.GenericClassLoader@159ea8e
-> java.net.URLClassLoader@82d37
-> sun.misc.Launcher$AppClassLoader@e39a3e
-> sun.misc.Launcher$ExtClassLoader@a39137
Class loader parent chain of IMyRemoteIntf as reported by r.getInterfaces():
sun.misc.Launcher$AppClassLoader@e39a3e
-> sun.misc.Launcher$ExtClassLoader@a39137
IMyRemoteIntf is in a jar file in WEB-INF/lib of my web application. I
tried prefer-web-inf-classes = true in weblogic.xml as well as
prefer-application-packages in weblogic-application.xml (with the
respective package of the interface).
Any ideas? I don't know what more I can try. I can access the same
server with this t3 URL just fine from outside of the WebLogic server.
Regards
Werner
I meant an issue about multi-connections. Although the socket is shared by all of the connections, each connection in RMI might correspond to a separated thread, I guess. Since the socket is shared by all rmi clients, the RMI channel would be a blocking connection. I am not sure if the RMI in JDK1.4 or above also use the nonblocking new I/O technique. Thanks.
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==========================================
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-- Rob
[email protected] wrote:
> Hi,
>
> in certain circumstances I get an Exception "Cannot narrow remote
> object to <some EJB-Home-Class>".
>
> My enviroment: weblogic 7.0, solaris, Java 1.3.1, J2EE-application
> (EJBs, Servlets, Database)
>
> In the init method of an start-up servlet I spawn some threads for a
> scheduler of the application. There are a scheduler core and some
> worker classes.
> The start-up servlet, all the other servlets and the schedulers
> classes are in an web-archive (war-file) in an ear-archiv. Furthermore
> there a some 3rd party archives in the ear-archive, a jndi.properties
> file etc. The manifest file of the war-archive contains a class-path,
> points to the 3rd party archives in the ear-archive.
>
> The schedulers workers code is simple:
>
> InitialContext jndiContext = ...getInitialContext();
> Object obj = jndiContext.lookup(<some EJB>);
>
> - EJBs home interface (for example):
> SyncOrderQueueHome home = (SyncOrderQueueHome)
> javax.rmi.PortableRemoteObject.narrow(obj,
> SyncOrderQueueHome.class);
>
> - EJBs remote interface:SyncOrderQueue sync = home.create();
>
> - call some business method
> sync.createOrderQueue();
> In the enviroment described above I get an " Exception: Cannot narrow
> remote object to <package>.SyncOrderQueueHome".
>
> On the other hand the scheduler and all the workers work fine as a
> standalone application (not in an app-server context) and in Oracles
> app-server (OC4J, v.9.0.3).
>
> I tried to understand, what for an object I get as the result of the
> JNDI lookup bevore the narrow method fails:
> - in the app-servers context:
> <package>.SyncOrderQueueEJB_4o6qkf_HomeImpl
> - outside the app-server:
> <package>.SyncOrderQueueEJB_4o6qkf_HomeImpl_WLStub
>
> What happened here? The common servlets use the same functionality and
> work fine. Why I get different objects? Where is the bug?
>
> Any ideas?
> Thomas
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How can i Sign back in the App Store to Download apps
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Upgrade from 3.0B (release 620) to BI 7.1 (release 710)
Hi, Please guide me whether it is possible to upgrade from BW 3.0B system to BI 7.1, I am in release 620 now. Can you please help me locate upgrade guide for the same? Looking forward for your replies Thank you Rajath
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Connecting macBook to digital satelite receiver
I have a MacBook Dual Core and want to use this computer as a TV. Is it pssible to connect my digital satelite receiver (Pioneer DBR-S120NL) to my MacBook. How to connect, using Scart or paralel exit of the receiver etcetera. and/or do I use other ha
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Satellite M40: Graphic Errors when changing screen resolution
Hi, I have a Satellite M40 and a big problem. in windows xp pro sp2: when a program changes the screen resolution, the screen gets messed up, I see only stripes and only a restart can get it back working (or suspend to disk). [edit] I plugged an exte