[jetty-user] Re: ClassCastException...Jetty6Continuation when hot deploying

Wow.  Crickets.  Is this mailing list dead?

Sean



On Wed, Apr 20, 2011 at 10:42 AM, Sean Rhea <[email protected]> wrote:
> Hello,
>
> I'm using jetty 6.1.22 with cometd-java-server-2.1.0 and
> jetty-continuation-7.3.0.v20110203.  I hot deploy my app using a
> WebAppContext, but when I touch the context file, the next attempt by
> a cometd client causes this error:
>
> java.lang.ClassCastException: org.eclipse.jetty.continuation.Jetty6Continuation
>        at org.eclipse.jetty.continuation.ContinuationFilter.doFilter(ContinuationFilter.java:76)
>        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
>        ...
>        (full stack trace below)
>
> Line 76 of ContinuationFilter.java is trying to cast the continuation
> to type Continuation, which Jetty6Continuation inherits, so it should
> work.  I suspect the problem is with the class loader, in that the
> Jetty6Continuation object in hand is from the class loader used before
> the restart, whereas the Continuation interface being used is the one
> from after the restart.  If that were the case, then in fact the
> exception is the expected behavior.  To try and fix it, I added
>
>  <Set name="systemClasses">
>    <Array type="java.lang.String">
>      <Item>org.eclipse.jetty.</Item>
>      ...
>    </Array>
>  </Set>
>
> to my context.xml, so that the Continuation interface and
> Jetty6Continuation class would be loaded by the system class loader,
> but that doesn't seem to have helped--I still get the exception.
>
> Has anyone else seen this?  Any ideas?  The full text of my web
> context is below.
>
> Thanks,
> Sean
>
> nmr.xml (my web context):
>
> <?xml version="1.0"  encoding="ISO-8859-1"?>
> <!DOCTYPE Configure PUBLIC "-//Mort Bay Consulting//DTD Configure//EN"
> "http://jetty.mortbay.org/configure.dtd">
> <Configure class="org.mortbay.jetty.webapp.WebAppContext">
>  <Set name="contextPath">/</Set>
>  <Set name="war"><SystemProperty name="jetty.home"
> default="."/>/webapps/nmr</Set>
>  <!-- <Set name="extractWAR">true</Set> -->
>  <Get name="errorHandler">
>    <Call name="setShowStacks">
>      <Arg type="boolean">false</Arg>
>    </Call>
>  </Get>
>  <Set name="copyWebDir">true</Set>
>  <Set name="systemClasses">
>    <Array type="java.lang.String">
>      <Item>java.</Item>
>      <Item>javax.</Item>
>      <Item>org.eclipse.jetty.</Item>
>      <Item>org.mortbay.</Item>
>      <Item>org.xml.</Item>
>      <Item>org.w3c.</Item>
>      <Item>org.srhea.scalaqlite.</Item>
>      <Item>scala.</Item>
>    </Array>
>  </Set>
> </Configure>
>
> web.xml:
>
> <web-app>
>  <servlet>
>    <servlet-name>cometd</servlet-name>
>    <servlet-class>org.cometd.server.CometdServlet</servlet-class>
>    <load-on-startup>1</load-on-startup>
>    <init-param>
>      <param-name>timeout</param-name>
>      <param-value>60000</param-value>
>    </init-param>
>    <init-param>
>      <param-name>logLevel</param-name>
>      <param-value>3</param-value>
>    </init-param>
>  </servlet>
>  <servlet-mapping>
>    <servlet-name>cometd</servlet-name>
>    <url-pattern>/cometd/*</url-pattern>
>  </servlet-mapping>
>
>  <servlet>
>    <servlet-name>initializer</servlet-name>
>    <servlet-class>BayeuxInitializer</servlet-class>
>    <load-on-startup>3</load-on-startup>
>  </servlet>
>
>  <filter>
>    <filter-name>continuation</filter-name>
>    <filter-class>org.eclipse.jetty.continuation.ContinuationFilter</filter-class>
>  </filter>
>  <filter-mapping>
>    <filter-name>continuation</filter-name>
>    <url-pattern>/cometd/*</url-pattern>
>  </filter-mapping>
>
>  <servlet>
>   <servlet-name>NmrServlet</servlet-name>
>   <servlet-class>NmrServlet</servlet-class>
>   <load-on-startup>2</load-on-startup>
>  </servlet>
>  <servlet-mapping>
>   <servlet-name>NmrServlet</servlet-name>
>   <url-pattern>/*</url-pattern>
>  </servlet-mapping>
> </web-app>
>
> full stack trace:
>
> java.lang.ClassCastException: org.eclipse.jetty.continuation.Jetty6Continuation
>        at org.eclipse.jetty.continuation.ContinuationFilter.doFilter(ContinuationFilter.java:76)
>        at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
>        at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
>        at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
>        at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
>        at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
>        at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
>        at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
>        at org.mortbay.jetty.Server.handle(Server.java:326)
>        at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
>        at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:398)
>        at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
>        at org.mortbay.jetty.nio.SelectChannelConnector$RetryContinuation.run(SelectChannelConnector.java:525)
>        at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
>
> --
> Construct the world in which you want to live.  Then live there.
>



-- 
Construct the world in which you want to live.  Then live there.

---------------------------------------------------------------------
To unsubscribe from this list, please visit:

    http://xircles.codehaus.org/manage_email