How to use RMI objects in a servlet

Hi,
I have just run the example RMI program in the java tutorial in my linux pc. Also I have another method to just echo a string back. It works fine when calling from command line.
Now I want to write a servlet that get a string when POSTed and call the RMI objects echo method and display the returned string.
I use Tomcat-5.0 which is installed in /usr/local. I moved the remote object interface jar to the common/lib folder and import the interface in my Servlet. I use the following statements inside the servlet to get the RMI object reference.
Registry registry = LocateRegistry.getRegistry("localhost");
Rser comp = (Rser) registry.lookup("rmiser");When i use this in my servlet the tomcat stops working.
Also I don't know how to specify the code base and security policy which I use in command prompt when calling RMI object.
Pls suggest me what to do and also specify any resources that explain this task step by step.
Thanks.

restarted the system and caught the following exception while calling the servlet.
Apr 30, 2009 12:24:15 PM org.apache.catalina.startup.Catalina start
INFO: Server startup in 3861 ms
java.security.AccessControlException: access denied (java.net.SocketPermission 127.0.0.1:1099 connect,resolve)
     at java.security.AccessControlContext.checkPermission(AccessControlContext.java:323)
     at java.security.AccessController.checkPermission(AccessController.java:546)
     at java.lang.SecurityManager.checkPermission(SecurityManager.java:532)
     at java.lang.SecurityManager.checkConnect(SecurityManager.java:1034)
     at java.net.Socket.connect(Socket.java:513)
     at java.net.Socket.connect(Socket.java:469)
     at java.net.Socket.<init>(Socket.java:366)
     at java.net.Socket.<init>(Socket.java:180)
     at sun.rmi.transport.proxy.RMIDirectSocketFactory.createSocket(RMIDirectSocketFactory.java:22)
     at sun.rmi.transport.proxy.RMIMasterSocketFactory.createSocket(RMIMasterSocketFactory.java:128)
     at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:595)
     at sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:198)
     at sun.rmi.transport.tcp.TCPChannel.newConnection(TCPChannel.java:184)
     at sun.rmi.server.UnicastRef.newCall(UnicastRef.java:322)
     at sun.rmi.registry.RegistryImpl_Stub.lookup(Unknown Source)
     at RequestParamExample1.doGet(RequestParamExample1.java:94)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
     at filters.ExampleFilter.doFilter(ExampleFilter.java:101)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:186)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)
     at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
     at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198)
     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152)
     at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
     at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
     at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)
     at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:118)
     at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
     at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929)
     at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)
     at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
     at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
     at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
     at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
     at java.lang.Thread.run(Thread.java:619)
Apr 30, 2009 12:25:19 PM org.apache.coyote.tomcat5.CoyoteAdapter service
SEVERE: An exception or error occurred in the container during the request processing
java.security.AccessControlException: access denied (java.lang.RuntimePermission setContextClassLoader)
     at java.security.AccessControlContext.checkPermission(AccessControlContext.java:323)
     at java.security.AccessController.checkPermission(AccessController.java:546)
     at java.lang.SecurityManager.checkPermission(SecurityManager.java:532)
     at java.lang.Thread.setContextClassLoader(Thread.java:1351)
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:151)
     at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:118)
     at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
     at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929)
     at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)
     at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
     at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
     at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
     at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
     at java.lang.Thread.run(Thread.java:619)
Exception in thread "ContainerBackgroundProcessor[StandardEngine[Catalina]]" java.security.AccessControlException: access denied (java.lang.RuntimePermission setContextClassLoader)
     at java.security.AccessControlContext.checkPermission(AccessControlContext.java:323)
     at java.security.AccessController.checkPermission(AccessController.java:546)
     at java.lang.SecurityManager.checkPermission(SecurityManager.java:532)
     at java.lang.Thread.setContextClassLoader(Thread.java:1351)
     at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1623)
     at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1608)
     at java.lang.Thread.run(Thread.java:619)
Hope u can find it now.
the line
at RequestParamExample1.doGet(RequestParamExample1.java:94)
is the file I am editing and using to call RMI.
Edited by: itsraja on Apr 30, 2009 12:06 AM

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