Hi,
I am trying to run the comet sample given along with tomcat. The sample is
not working correctly most of the time. I am using NIO connectors and Tomcat
version is 6.0.10.
I have some doubts also:
1) In the ChatServer example, a thread (using a Runnable MessageSender) is
sending responses the clients. Is it possible to write multiple times to the
same response. Because when we do writer.flush() then that response is sent
to the client.
2) The READ event is never invoked in my example. whenever I send a request
only BEGIN event is getting called. I thought, for the first time only BEGIN
event should get called, and for further requests by the same client, READ
event should get called.
3) I am getting exception at the line where the thread which is trying to
write to response stream is calling the flush method.
The code (from tomcat example) is:
for (int i = 0; i < connections.size(); i++) {
try {
PrintWriter writer =
connections.get(i).getWriter();
String toBeFlushed = "";
for (int j = 0; j < pendingMessages.length; j++)
{
// FIXME: Add HTML filtering
writer.println(pendingMessages[j] +
"<br/>");
}
writer.println("Random message 1" + "<br/>");
writer.println("Random message 2" + "<br/>");
System.out.println("writer will flush now.
writer is null?=" + writer == null);
writer.flush();
} catch (IOException e) {
log("IOExeption sending message", e);
}
}
And the error message I am getting is:
Exception in thread "MessageSender[/CometTestApp]"
java.lang.NullPointerException
at
org.apache.coyote.http11.InternalNioOutputBuffer.addToBB(InternalNioOutputBuffer.java:607)
at
org.apache.coyote.http11.InternalNioOutputBuffer.commit(InternalNioOutputBuffer.java:600)
at
org.apache.coyote.http11.Http11NioProcessor.action(Http11NioProcessor.java:1010)
at org.apache.coyote.Response.action(Response.java:183)
at org.apache.coyote.Response.sendHeaders(Response.java:379)
at
org.apache.catalina.connector.OutputBuffer.doFlush(OutputBuffer.java:305)
at
org.apache.catalina.connector.OutputBuffer.flush(OutputBuffer.java:288)
at
org.apache.catalina.connector.CoyoteWriter.flush(CoyoteWriter.java:95)
at
com.headstrong.test.ChatServlet$MessageSender.run(ChatServlet.java:276)
at java.lang.Thread.run(Thread.java:595)
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