Hello all,
I'm having problems trying to write a HttpTunnel for java objects in Tomcat.
For some reason I'm getting a ClassCastException. I don't understand this.
I've even tried forcing it as you can see in my code below. The exception
that i'm getting is not very clear and i can't put my finger on it.
I have attached the exception from Apache/Tomcat and the code for the tunnel
at the bottom of this email. If you can help I would be very grateful.
Regards,
Stuart Stephen
----------------------------------------------------------------------------
----
Apache Tomcat/4.0.1 - HTTP Status 500 - Internal Server Error
----------------------------------------------------------------------------
----
type Exception report
message Internal Server Error
description The server encountered an internal error (Internal Server Error)
that prevented it from fulfilling this request.
exception
java.lang.ClassCastException: TestTunnel
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:820)
at
org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:615)
at
org.apache.catalina.servlets.InvokerServlet.serveRequest(InvokerServlet.java
:396)
at
org.apache.catalina.servlets.InvokerServlet.doGet(InvokerServlet.java:180)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application
FilterChain.java:247)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh
ain.java:193)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.ja
va:243)
at
org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:5
66)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.ja
va:201)
at
org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:5
66)
at
org.apache.catalina.valves.CertificatesValve.invoke(CertificatesValve.java:2
46)
at
org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:5
64)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at
org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2344)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164
)
at
org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:5
66)
at
org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.
java:170)
at
org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:5
64)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:170
)
at
org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:5
64)
at
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:462)
at
org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:5
64)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java
:163)
at
org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:5
66)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at org.apache.ajp.tomcat4.Ajp13Processor.process(Ajp13Processor.java:371)
at org.apache.ajp.tomcat4.Ajp13Processor.run(Ajp13Processor.java:424)
at java.lang.Thread.run(Unknown Source)
-----------------------
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.ServletException.*;
import javax.servlet.UnavailableException.*;
import java.lang.Exception.*;
import java.io.*;
import java.util.*;
import java.net.*;
public class TestTunnel extends Thread {
// applet connections
ObjectOutputStream objOut = null;
ObjectInputStream objIn = null;
// chatserver connections
Socket socket = null;
ObjectOutputStream sockObjOut = null;
ObjectInputStream sockObjIn = null;
ToApplet app = null;
ToServer ser = null;
protected void service(HttpServletRequest req, HttpServletResponse res)
throws ServletException,IOException {
try {
// get data stream from applet
System.err.println("start of servlet");
objIn = new ObjectInputStream(req.getInputStream());
objOut = new ObjectOutputStream(res.getOutputStream());
// create socket to chat server and the streams
socket = new Socket("127.0.0.1", 3000);
sockObjOut = new ObjectOutputStream(socket.getOutputStream());
sockObjIn = new ObjectInputStream(socket.getInputStream());
app = new ToApplet((TestTunnel)this);
ser = new ToServer((TestTunnel)this);
System.err.println("end of servlet");
}
catch(Exception e) {
e.printStackTrace();
}
}
public void destroy() {
try {
objIn.close();
objOut.close();
sockObjIn.close();
sockObjOut.close();
socket.close();
}
catch(Exception e) {
e.printStackTrace();
}
}
private class ToApplet extends Thread {
TestTunnel parent = null;
public ToApplet(TestTunnel parent) {
try {
this.parent = parent;
this.start();
}
catch(Exception e) {
e.printStackTrace();
}
}
public void run() {
try {
Object obj = null;
while((obj=parent.sockObjIn.readObject())!=null) {
write(obj);
}
}
catch(Exception e) {
e.printStackTrace();
}
}
public void write(Object msg) {
try {
parent.objOut.writeObject(msg);
parent.objOut.flush();
parent.objOut.reset();
}
catch(Exception e) {
e.printStackTrace();
}
}
}
private class ToServer extends Thread {
TestTunnel parent = null;
public ToServer(TestTunnel parent) {
try {
this.parent = parent;
this.start();
}
catch(Exception e) {
e.printStackTrace();
}
}
public void run() {
try {
Object obj = null;
while((obj=parent.objIn.readObject())!=null) {
write(obj);
}
}
catch(Exception e) {
e.printStackTrace();
}
}
public void write(Object msg) {
try {
parent.sockObjOut.writeObject(msg);
parent.sockObjOut.flush();
parent.sockObjOut.reset();
}
catch(Exception e) {
e.printStackTrace();
}
}
}
}
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