Hi List,
I'm somewhat new to servlets and all, but managed to get
to run a small trial webapp (chat-like) using Tomcat 3.2:
Servlet-Engine: Tomcat Web Server/3.2.1 (JSP 1.1; Servlet 2.2;
Java 1.3.0; Linux 2.2.16 i386; java.vendor=Sun Microsystems Inc.)
Simplified, I have a class like this:
public class Receiver extends HttpServlet {
// ...
public void doGet(HttpServletRequest rq, HttpServletResponse rs)
throws IOException, ServletException
{
rs.setBufferSize(0);
rs.setContentType("text/html");
PrintWriter out = rs.getWriter();
makeHead(out);
out.println("<P>Chat Receiver</P>\n");
rs.flushBuffer();
while (! terminate) {
// log("in main loop", new Exception("-")); // Line 57
synchronized(writeCond) {
try {
writeCond.wait();
} catch (InterruptedException ie) {
// theContext.log("Receiver interrupted while waiting for text.");
}
}
// theContext.log("write cond fired!", new Exception("-"));
synchronized(writeLock) {
out.print(writeMessage.toString());
rs.flushBuffer();
writeMessage.setLength(0);
}
// theContext.log("wrote received text", new Exception("-"));
}
out.println("</BODY></HTML>");
}
---
Unfortunately, the first log(...) call fails with a NullPointerException
if uncommented:
java.lang.NullPointerException
at nop.Receiver.doGet(Receiver.java:57)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:404)
at org.apache.tomcat.core.Handler.service(Handler.java:286)
at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
at
org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:797)
at org.apache.tomcat.core.ContextManager.service(ContextManager.java:743)
at
org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:210)
at org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416)
at org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:498)
at java.lang.Thread.run(Thread.java:484)
---
What could be wrong here? As far as I understand, Servlet.log(java.lang.String)
should write a log entry to the server log file. How come it doesn't?
--
Best regards,
Ansgar W. Konermann
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