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:
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)
HI Ritesh, Could you please share the information that how you have configured Tomcat 6.0 with NIO
You are not getting events for Read because, everytime its a new request and for that you are getting only Begin event. Read even is fired when a message comes from the client over the same HTTP connection already established...I Guess.