java.lang.NoClassDefFoundError: javax/portlet/ActionResponse

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java.lang.NoClassDefFoundError: javax/portlet/ActionResponse
at org.jboss.seam.core.Manager.writeConversationIdToResponse(Manager.java:345)
at org.jboss.seam.core.Manager.storeConversation(Manager.java:302)
at org.jboss.seam.jsf.SeamPhaseListener.storeAnyConversationContext(SeamPhaseListener.java:235)
at org.jboss.seam.jsf.SeamPhaseListener.beforeSaveState(SeamPhaseListener.java:189)
at org.jboss.seam.jsf.SeamPhaseListener.afterPhase(SeamPhaseListener.java:169)

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