Stuart, You're extending Thread - everything that is mapped to a Tomcat request must extend HttpServlet. Tomcat is trying to cast your TestTunnel class to HttpServlet, which is failing.
Andy > -----Original Message----- > From: Stuart Stephen [mailto:[EMAIL PROTECTED]] > Sent: 15 May 2002 11:56 > To: Tomcat Users List > Subject: HTTP Tunnelling problem?? Please help > > > > 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(InvokerSe > rvlet.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(A > pplication > FilterChain.java:247) > at > org.apache.catalina.core.ApplicationFilterChain.doFilter(Applicati > onFilterCh > ain.java:193) > at > org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapp > erValve.ja > va:243) > at > org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipel > ine.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(StandardConte > xtValve.ja > va:201) > at > org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipel > ine.java:5 > 66) > at > org.apache.catalina.valves.CertificatesValve.invoke(CertificatesVa > lve.java:2 > 46) > at > org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipel > ine.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(StandardHostValv > e.java:164 > ) > at > org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipel > ine.java:5 > 66) > at > org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispat > cherValve. > java:170) > at > org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipel > ine.java:5 > 64) > at > org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValv > e.java:170 > ) > at > org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipel > ine.java:5 > 64) > at > org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:462) > at > org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipel > ine.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(StandardEngine > Valve.java > :163) > at > org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipel > ine.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(); > } > } > } > } > > > > -- > To unsubscribe, e-mail: > <mailto:[EMAIL PROTECTED]> > For additional commands, e-mail: > <mailto:[EMAIL PROTECTED]> > > -- To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]> For additional commands, e-mail: <mailto:[EMAIL PROTECTED]>
