JVM freeze on SocketRead

Question

Hi!
Try to explain my problem. I have a Servlet (call com.foo.core.ProxyServlet) which uses HttpUrLConnection (it's a proxy). The problem is : after a week all thread are frozen in the same method. Here the thread dump :
"ExecuteThread: '26' for queue: 'default'" daemon prio=5 tid=0x2589f8 nid=0x26 runnable [0xcd380000..0xcd381a38]
     at java.net.SocketInputStream.socketRead(Native Method)
     at java.net.SocketInputStream.read(SocketInputStream.java:86)
     at java.io.BufferedInputStream.fill(BufferedInputStream.java:186)
     at java.io.BufferedInputStream.read(BufferedInputStream.java:204)
     at weblogic.net.http.MessageHeader.parseHeader(MessageHeader.java:132)
     at weblogic.net.http.HttpClient.parseHTTP(HttpClient.java:286)
     at weblogic.net.http.HttpURLConnection.getInputStream(HttpURLConnection.java:282)
     at com.foo.core.ProxyServlet.performTask(proxyServlet.java:143)
     at com.foo.core.ProxyServlet.doPost(proxyServlet.java:63)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:213)
     at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:1302)
     at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:1680)
     at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:137)
     at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)Here a part of the source code (where the thread stop)
     String uri = request.getParameter("uri");
     String sourceServlet = _HTTPServer + uri;
     String method = request.getMethod();
     URL url = new URL(sourceServlet);
     HttpURLConnection uc = (HttpURLConnection)url.openConnection();
     uc.setDoOutput(true);
     uc.setDoInput(true);
     uc.setUseCaches(false);
     uc.setAllowUserInteraction(false);
     uc.setRequestMethod(method);
     uc.connect();
     InputStream is = uc.getInputStream();I work with WebLogic 6.0 SP2 RP2, jdk1.3.0, Solaris 2.6
Thx for help
Simon Pierre NOLIN

Answer 1

Hi
The ProxyServlet is like a proxy : it receive data from client (GET and POST), ask the 'real' server, do some work with the response (if the response is in XML/XSL it will be transform to HTML) and send the HTML to the client.
As i said in the post, the problem occur after a week : every day one or two thread are frozen and gradually the JVM is frozen.
I will try to set the ouput to false and test. I think i can not rid the setRequestMethod
Simon Pierre NOLIN