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Message:

Jini & servlets

Posted by Antonio on October 08, 2001 at 8:05 AM

First: sorry for my english.

I have a problem. I'm using servlets with Tomcat 3.2.3.
I have a servlet which uses Jini to get a service in my network,
well, I perform lookup in the init() method and the service (m_servlet.Service) is recovered but when I cast it to the service interface (m_servlet.ServiceInterface) the result is an exception:

java.lang.ClassCastException: m_servlet.Service
at m_servlet.LookUpServlet.init(LookUpServlet.java:93)
at javax.servlet.GenericServlet.init(GenericServlet.java:258)
at org.apache.tomcat.core.ServletWrapper.doInit(ServletWrapper.java:317)

at org.apache.tomcat.core.Handler.init(Handler.java:215)
at org.apache.tomcat.core.ServletWrapper.init(ServletWrapper.java:296)
at org.apache.tomcat.core.Handler.service(Handler.java:254)
at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372
)
at org.apache.tomcat.core.ContextManager.internalService(ContextManager.
java:797)
at org.apache.tomcat.core.ContextManager.service(ContextManager.java:743
)
at org.apache.tomcat.service.connector.Ajp12ConnectionHandler.processCon
nection(Ajp12ConnectionHandler.java:166)
at org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:
416)
at org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java
:498)
at java.lang.Thread.run(Thread.java:484)

I think that it is caused by the different classloaders used by the container, in fact I have printed these classloaders:

this.getClass().getClassLoader() ---> AdaptiveClassLoader( )
this.getServletContext().getClass().getClassLoader() ---> sun.misc.Launcher$AppClassLoader@1c5c1
Thread.currentThread().getContextClassLoader() ---> sun.misc.Launcher$AppClassLoader@1c5c1
ClassLoader.getSystemClassLoader().toString() ---> sun.misc.Launcher$AppClassLoader@1c5c1

ServiceInterface.class.getClassLoader() ---> AdaptiveClassLoader( )
net.jini.core.entry.Entry.class.getClassLoader() ---> sun.misc.Launcher$AppClassLoader@1c5c1

But I haven't found a solution which works.
Can you help me? Is it possible to reach a solution without configuring cointainer settings and ina cross-container manner?

Thanks in advance,

Regards,

Antonio