users@grizzly.java.net

RE: "CometHandler cannot be null" when registering with comet engine

From: John C. Turnbull <ozemale_at_ozemail.com.au>
Date: Tue, 13 Jul 2010 04:13:48 +1000

Hi Alexey,

 

I am using 3.0.1, the one that comes with NetBeans 6.9.

 

Thanks,

 

John

 

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