[jboss-user] [JBoss Portal] - Re: Error while deploying JSR 286 Portlet on JBoss Portal 2.

[PeterJ]

Always look at the "cause by" to determine the root cause:

Caused by: java.lang.ClassCastException: org.jboss.portal.portlet.samples.SimplestHelloWorldPortlet cannot be cast to javax.portlet.Portlet

Two possibilities:

1) Your portlet does not extend javax.portlet.GenericPortlet (which extends javax.portlet.Portlet).

2) You included the portlet API JAR file in your portlet's WAR file. If so, remove it.

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