Hi Alexey,
OK, I have made some progress. It seems that the stack trace is somewhat
bogus as I narrowed part of my problem down to the fact that I was using a
deprecated form of the notify() method which took a comet handler ID. By
replacing this with a version of notify() that takes the comet handler
itself I now don't get any exceptions but I find that the comet handler's
onEvent() method is never being called even though I am definitely calling
notify().
This is very similar to the other current post on this list titled
"onEvent() not invoked by notify()". My code is virtually identical to the
code submitted in that post i.e. the most basic example. I am getting an
onInitialize() method call but nothing after that.
Any thoughts?
Thanks,
-JCT
From: Oleksiy.Stashok_at_Sun.COM [mailto:Oleksiy.Stashok_at_Sun.COM]
Sent: Monday, 12 July 2010 22:20
To: users_at_grizzly.dev.java.net
Subject: Re: "CometHandler cannot be null" when registering with comet
engine
Hi John,
which GFv3 version are you using? Can I ask you to try at least GF 3.0.1?
Thanks.
WBR,
Alexey.
On Jul 10, 2010, at 15:00 , John C. Turnbull wrote:
I am trying to port an application that has been working fine with GlassFish
v2 to v3 but am encountering the following exception when trying to register
a topic with the comet engine.
java.lang.IllegalStateException: CometHandler cannot be null. This
CometHandler was probably resumed and an invalid reference was made to it.
at
com.sun.grizzly.comet.CometContext.<clinit>(CometContext.java:181)
at com.sun.grizzly.comet.CometEngine.register(CometEngine.java:284)
at com.sun.grizzly.comet.CometEngine.register(CometEngine.java:259)
at com.sun.grizzly.comet.CometEngine.register(CometEngine.java:244)
at com.test.MyServlet.init(MyServlet.java:63)
at
org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:14
28)
at
org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:1060)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.ja
va:187)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.ja
va:188)
at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:641)
at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:97)
at
com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLock
ingStandardPipeline.java:85)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:185
)
at
org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:332
)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:233)
at
com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.
java:165)
at
com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:791)
at
com.sun.grizzly.comet.CometEngine.executeServlet(CometEngine.java:473)
at com.sun.grizzly.comet.CometEngine.handle(CometEngine.java:341)
at
com.sun.grizzly.comet.CometAsyncFilter.doFilter(CometAsyncFilter.java:84)
at
com.sun.grizzly.arp.DefaultAsyncExecutor.invokeFilters(DefaultAsyncExecutor.
java:161)
at
com.sun.grizzly.arp.DefaultAsyncExecutor.interrupt(DefaultAsyncExecutor.java
:137)
at
com.sun.grizzly.arp.AsyncProcessorTask.doTask(AsyncProcessorTask.java:88)
at com.sun.grizzly.http.TaskBase.run(TaskBase.java:189)
at
com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.jav
a:330)
at
com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:3
09)
at java.lang.Thread.run(Thread.java:619)
Why is it trying to access the comet handler at this point? I haven't even
created one at this stage as I am just trying to initialise the servlet.
Here's the servlet's init() method where the problem is occurring:
public void init(ServletConfig config) throws
ServletException {
super.init(config);
ServletContext sc =
config.getServletContext();
String contextPath = sc.getContextPath() +
"/MyServlet";
cometContext =
CometEngine.getEngine().register(contextPath);
cometContext.setExpirationDelay(-1);
}
The relevant line is the call to register().
As I said, this has been working fine with GlassFish v2. The only changes I
made to port it to v3 were to change the import statements in all my
comet-related classes.
Why is this not working anymore? Do I need to change something else?
Thanks,
-JCT