Details
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Improvement
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Status: Resolved
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Minor
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Resolution: Fixed
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2.0.0
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None
Description
When portlet.xml cannot be found (input stream is null) the error message log is not very helpful and is a bit cryptic "is cannot be null - verify portlet.xml structure" or something of the sort.
The main head ache with this is that it doesn't show the cause exception on the web page (IMO it should), but it does show the cause exception in the log.
After a bit of debugging, i traced it down, and my portlet,xml's structure was fine, it just wasn't being deployed (m2eclipse doesn't think src/main/webapp should be a source folder, so WTP wasn't copying the deployment descriptor to the server). So I propose the following slight change:
in PortletDescriptorRegistry#createDefinition:
InputStream in = servletContext.getResourceAsStream(PORTLET_XML); + if (in == null) + { + throw new PortletContainerException("Cannot find " + PORTLET_XML + + ". Are you sure it is in the deployed package?"); + }
Other wise you just get on the web page is the following:
Error rendering portlet. java.lang.NullPointerException: Unable to load Portlet App Deployment Descriptor:Error loading portlet.xml at context Welcome to Tomcat. Please validate the file structure of this portlets portlet.xml file. at org.apache.pluto.internal.impl.PortletEntityImpl.load(PortletEntityImpl.java:203) at org.apache.pluto.internal.impl.PortletEntityImpl.getPortletDefinition(PortletEntityImpl.java:154) at org.apache.pluto.internal.impl.MimeResponseImpl.(MimeResponseImpl.java:116) at org.apache.pluto.internal.impl.RenderResponseImpl.(RenderResponseImpl.java:57) at org.apache.pluto.core.DefaultPortletEnvironmentService.createRenderResponse(DefaultPortletEnvironmentService.java:70) at org.apache.pluto.core.PortletContainerImpl.doRender(PortletContainerImpl.java:215) at org.apache.pluto.driver.tags.PortletTag.doStartTag(PortletTag.java:152) at org.apache.jsp.WEB_002dINF.themes.portlet_002dskin_jsp._jspx_meth_pluto_005fportlet_005f0(portlet_002dskin_jsp.java:105) at org.apache.jsp.WEB_002dINF.themes.portlet_002dskin_jsp._jspService(portlet_002dskin_jsp.java:79) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:337) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266) at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:630) at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:535) at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:472) at org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:968) at org.apache.jsp.WEB_002dINF.themes.pluto_002ddefault_002dtheme_jsp._jspx_meth_c_005fforEach_005f1(pluto_002ddefault_002dtheme_jsp.java:527) at org.apache.jsp.WEB_002dINF.themes.pluto_002ddefault_002dtheme_jsp._jspx_meth_c_005fotherwise_005f0(pluto_002ddefault_002dtheme_jsp.java:471) at org.apache.jsp.WEB_002dINF.themes.pluto_002ddefault_002dtheme_jsp._jspx_meth_c_005fchoose_005f0(pluto_002ddefault_002dtheme_jsp.java:332) at org.apache.jsp.WEB_002dINF.themes.pluto_002ddefault_002dtheme_jsp._jspService(pluto_002ddefault_002dtheme_jsp.java:165) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:337) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266) at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:630) at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:436) at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:374) at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:302) at org.apache.pluto.driver.PortalDriverServlet.doGet(PortalDriverServlet.java:197) at javax.servlet.http.HttpServlet.service(HttpServlet.java:690) at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:525) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447) at java.lang.Thread.run(Thread.java:595)
and in the logs it adds:
Caused by: java.io.IOException: is parameter must not be null
at org.apache.pluto.descriptors.services.jaxb.PortletAppDescriptorServiceImpl.read(PortletAppDescriptorServiceImpl.java:52)
at org.apache.pluto.internal.PortletDescriptorRegistry.createDefinition(PortletDescriptorRegistry.java:159)
... 54 more
however the message is parameter must not be null is from jaxb and is missleading because "is" is actually inputstream but it sort of implies (is how i read it) that "is" is a parameter in your portlet.xml.
the addition I suggest changes all that to this:
SEVERE: Unable to load Portlet App Deployment Descriptor:Cannot find /WEB-INF/portlet.xml. Are you sure it is in the deployed package? org.apache.pluto.PortletContainerException: Cannot find /WEB-INF/portlet.xml. Are you sure it is in the deployed package? at org.apache.pluto.internal.PortletDescriptorRegistry.createDefinition(PortletDescriptorRegistry.java:156) at org.apache.pluto.internal.PortletDescriptorRegistry.getPortletAppDD(PortletDescriptorRegistry.java:130)