ClassCastException when extending JBossPortlet

[mat.lowery]

Environment:
JBoss Portal/AS Version: Downloaded JBoss Portal + JBoss AS 2.4
OS Platform: Windows XP
Java: 1.4.2_12

Problem:
Extending JBossPortlet (using CatalogPortlet as a guide) yields a ClassCastException when render is called.

PortletContainer.invokeRender() is calling JBossPortlet.render(RenderRequest, RenderResponse) with arguments of type RenderRequestImpl and RenderResponseImpl. JBossPortlet then attempts to cast those arguments to JBossRenderRequest and JBossRenderResponse which results in the exception.

I'm sure I'm doing something stupid. Can anyone enlighten me?

Note that my code (a subclass of JBossPortlet) never gets called.

Stack Trace:

java.lang.ClassCastException
 at org.jboss.portlet.JBossPortlet.render(JBossPortlet.java:384)
 at org.jboss.portal.portlet.container.PortletContainer.invokeRender(PortletContainer.java:519)
 ...

portlet.xml:

 <portlet>
 <portlet-name>PentahoMenuPortlet</portlet-name>
 <portlet-class>
 org.pentaho.ui.portlet.PentahoMenuPortlet
 </portlet-class>
 <supports>
 <mime-type>text/html</mime-type>
 <portlet-mode>VIEW</portlet-mode>
 </supports>
 <portlet-info>
 <title>PentahoMenuPortlet</title>
 </portlet-info>
 </portlet>

portlet-instances.xml:

 <deployment>
 <instance>
 <instance-id>PentahoMenuInstance</instance-id>
 <portlet-ref>PentahoMenuPortlet</portlet-ref>
 </instance>
 </deployment>

default-object.xml:

<deployments>
 <deployment>
 <parent-ref>default</parent-ref>
 <if-exists>overwrite</if-exists>
 <page>
 <page-name>Pentaho</page-name>
 <window>
 <window-name>NavigationPortletWindow</window-name>
 <instance-ref>NavigationPortletInstance</instance-ref>
 <region>navigation</region>
 <height>0</height>
 <properties>
 <property>
 <name>theme.windowRendererId</name>
 <value>emptyRenderer</value>
 </property>
 <property>
 <name>theme.decorationRendererId</name>
 <value>emptyRenderer</value>
 </property>
 <property>
 <name>theme.portletRendererId</name>
 <value>emptyRenderer</value>
 </property>
 </properties>
 </window>
 <window>
 <window-name>PentahoNewsWindow</window-name>
 <instance-ref>PentahoNewsInstance</instance-ref>
 <region>center</region>
 <height>0</height>
 </window>
 <window>
 <window-name>PentahoMenuWindow</window-name>
 <instance-ref>PentahoMenuInstance</instance-ref>
 <region>left</region>
 <height>0</height>
 </window>
 ...

[bdaw]

Looks like classloading. If you package portal libs with this class into your war file try removing it.

[mat.lowery]

That was my problem! There were JBoss portal JARs in my WAR. Thanks!