My stateless EJB use JAI in Jboss5.1.0GA,and i run my jsp project in tomcat5.5,which would remote call my ejb's method.why i got ClassNotFoundException?

description The server encountered an internal error () that  prevented it from fulfilling this request.

exception

org.apache.jasper.JasperException
     org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:498)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:411)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:308)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:259)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:729)

root cause

java.lang.reflect.UndeclaredThrowableException
     $Proxy2.getImg(Unknown Source)
     img.doimg.getimagesrc(doimg.java:23)
     org.apache.jsp.index_jsp._jspService(index_jsp.java:71)
     org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:369)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:308)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:259)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:729)

root cause

java.lang.ClassNotFoundException: javax.media.jai.remote.SerializableRenderedImage
     org.jboss.remoting.serialization.ClassLoaderUtility.loadClass(ClassLoaderUtility.java:103)
     org.jboss.remoting.loading.RemotingClassLoader.loadClass(RemotingClassLoader.java:86)
     java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
     java.lang.Class.forName0(Native Method)
     java.lang.Class.forName(Class.java:242)
     org.jboss.remoting.loading.ObjectInputStreamWithClassLoader.resolveClass(ObjectInputStreamWithClassLoader.java:179)
     java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1538)
     java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1460)
     java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1693)
     java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1299)
     java.io.ObjectInputStream.readObject(ObjectInputStream.java:339)
     img.Myimg.readObject(Myimg.java:47)
     sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     java.lang.reflect.Method.invoke(Method.java:585)
     java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:919)
     java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1813)
     java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1713)
     java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1299)
     java.io.ObjectInputStream.readObject(ObjectInputStream.java:339)
     org.jboss.aop.joinpoint.InvocationResponse.readExternal(InvocationResponse.java:119)
     java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:1753)
     java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1711)
     java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1299)
     java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1912)
     java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1836)
     java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1713)
     java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1299)
     java.io.ObjectInputStream.readObject(ObjectInputStream.java:339)
     org.jboss.remoting.serialization.impl.java.JavaSerializationManager.receiveObjectVersion2_2(JavaSerializationManager.java:238)
     org.jboss.remoting.serialization.impl.java.JavaSerializationManager.receiveObject(JavaSerializationManager.java:138)
     org.jboss.remoting.marshal.serializable.SerializableUnMarshaller.read(SerializableUnMarshaller.java:123)
     org.jboss.remoting.transport.socket.MicroSocketClientInvoker.versionedRead(MicroSocketClientInvoker.java:1220)
     org.jboss.remoting.transport.socket.MicroSocketClientInvoker.transport(MicroSocketClientInvoker.java:850)
     org.jboss.remoting.MicroRemoteClientInvoker.invoke(MicroRemoteClientInvoker.java:165)
     org.jboss.remoting.Client.invoke(Client.java:1724)
     org.jboss.remoting.Client.invoke(Client.java:629)
     org.jboss.aspects.remoting.InvokeRemoteInterceptor.invoke(InvokeRemoteInterceptor.java:60)
     org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
     org.jboss.aspects.tx.ClientTxPropagationInterceptor.invoke(ClientTxPropagationInterceptor.java:61)
     org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
     org.jboss.ejb3.security.client.SecurityClientInterceptor.invoke(SecurityClientInterceptor.java:65)
     org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
     org.jboss.ejb3.remoting.IsLocalInterceptor.invoke(IsLocalInterceptor.java:74)
     org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
     org.jboss.aspects.remoting.PojiProxy.invoke(PojiProxy.java:62)
     $Proxy3.invoke(Unknown Source)
     org.jboss.ejb3.proxy.impl.handler.session.SessionProxyInvocationHandlerBase.invoke(SessionProxyInvocationHandlerBase.java:207)
     org.jboss.ejb3.proxy.impl.handler.session.SessionProxyInvocationHandlerBase.invoke(SessionProxyInvocationHandlerBase.java:164)
     $Proxy2.getImg(Unknown Source)
     img.doimg.getimagesrc(doimg.java:23)
     org.apache.jsp.index_jsp._jspService(index_jsp.java:71)
     org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:369)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:308)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:259)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
     org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
     org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)
     org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:879)
     org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
     org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
     org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
     org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
     java.lang.Thread.run(Thread.java:595)
     org.jboss.aspects.remoting.InvokeRemoteInterceptor.invoke(InvokeRemoteInterceptor.java:72)
     org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
     org.jboss.aspects.tx.ClientTxPropagationInterceptor.invoke(ClientTxPropagationInterceptor.java:61)
     org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
     org.jboss.ejb3.security.client.SecurityClientInterceptor.invoke(SecurityClientInterceptor.java:65)
     org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
     org.jboss.ejb3.remoting.IsLocalInterceptor.invoke(IsLocalInterceptor.java:74)
     org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
     org.jboss.aspects.remoting.PojiProxy.invoke(PojiProxy.java:62)
     $Proxy3.invoke(Unknown Source)
     org.jboss.ejb3.proxy.impl.handler.session.SessionProxyInvocationHandlerBase.invoke(SessionProxyInvocationHandlerBase.java:207)
     org.jboss.ejb3.proxy.impl.handler.session.SessionProxyInvocationHandlerBase.invoke(SessionProxyInvocationHandlerBase.java:164)
     $Proxy2.getImg(Unknown Source)
     img.doimg.getimagesrc(doimg.java:23)
     org.apache.jsp.index_jsp._jspService(index_jsp.java:71)
     org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:369)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:308)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:259)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:729)

note The full stack trace of the root cause is available in the  Apache Tomcat/5.5.30 logs.

     i have install the JAI correctly,and i try to copy the jar to the server's lib ,but i still got the error.BTY,i use the jdk1.6.

     Help me !!!! I'm exhausted·····,thank U.