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This exception has no message.
java.lang.NullPointerException: 	at oracle.portal.provider.v2.render.PortletRendererUtil.portletParameter(Unknown Source)	at oracle.webdb.provider.v2.struts.StrutsUtils.createHref(Unknown Source)	at oracle.webdb.provider.v2.taglib.struts.html.PDKLinkTag.doStartTag(Unknown Source)