java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at com.sun.faces.context.ExternalContextImpl.dispatch(ExternalContextImpl.java:346)
at oracle.adfinternal.view.faces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:157)
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:107)
at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:245)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:214)

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