NPE when refreshing page after restart

• Key: JS2-216
• Type: Bug
• Status: Resolved
• Resolution: Fixed
• Priority: Major
• Assignee: Unassigned
• Reporter: Howard M. Lewis Ship
• Component/s: Deployment
• Affects Version/s: 2.0-M1
• Fix Version/s: 2.0-dev/cvs, 2.0-M2

Description

I've had to frequently stop/restart Tomcat to pick up some changes to portlets (or rather, auxilliary classes used by the portlets).

If, after stopping and restarting Tomcat, I refresh the portal web page (i.e., with a URL like http://localhost:8080/jetspeed/portal/_ns:YWRwLTE5fGMwfGQx/), I get:

VelocityViewServlet : Error processing the template

java.lang.NullPointerException
at org.apache.jetspeed.velocity.JetspeedVelocityViewServlet.getVelocityEngine(JetspeedVelocityViewServlet.java:296)
at org.apache.jetspeed.velocity.JetspeedVelocityViewServlet.getTemplate(JetspeedVelocityViewServlet.java:208)
at org.apache.velocity.tools.view.servlet.VelocityViewServlet.handleRequest(Unknown Source)
at org.apache.portals.bridges.velocity.BridgesVelocityViewServlet.handleRequest(BridgesVelocityViewServlet.java:85)
at org.apache.jetspeed.velocity.JetspeedVelocityViewServlet.handleRequest(JetspeedVelocityViewServlet.java:186)
at org.apache.velocity.tools.view.servlet.VelocityViewServlet.doRequest(Unknown Source)
at org.apache.velocity.tools.view.servlet.VelocityViewServlet.doGet(Unknown Source)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:704)
at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:590)
at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:510)
at org.apache.jetspeed.container.JetspeedContainerServlet.doGet(JetspeedContainerServlet.java:259)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:704)
at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:590)
at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:510)
at org.apache.jetspeed.container.invoker.ServletPortletInvoker.invoke(ServletPortletInvoker.java:213)
at org.apache.jetspeed.container.invoker.ServletPortletInvoker.render(ServletPortletInvoker.java:124)
at org.apache.pluto.PortletContainerImpl.renderPortlet(PortletContainerImpl.java:103)
at org.apache.jetspeed.container.JetspeedPortletContainerWrapper.renderPortlet(JetspeedPortletContainerWrapper.java:88)
at org.apache.jetspeed.aggregator.impl.PortletRendererImpl.renderNow(PortletRendererImpl.java:110)
at org.apache.jetspeed.aggregator.impl.PageAggregatorImpl.build(PageAggregatorImpl.java:251)
at org.apache.jetspeed.aggregator.AggregatorValve.invoke(AggregatorValve.java:48)
at org.apache.jetspeed.pipeline.JetspeedPipeline.invokeNext(JetspeedPipeline.java:209)
at org.apache.jetspeed.pipeline.valve.impl.ActionValveImpl.invoke(ActionValveImpl.java:117)
at org.apache.jetspeed.pipeline.JetspeedPipeline.invokeNext(JetspeedPipeline.java:209)
at org.apache.jetspeed.container.ContainerValve.invoke(ContainerValve.java:76)
at org.apache.jetspeed.pipeline.JetspeedPipeline.invokeNext(JetspeedPipeline.java:209)
at org.apache.jetspeed.profiler.impl.ProfilerValveImpl.invoke(ProfilerValveImpl.java:133)
at org.apache.jetspeed.pipeline.JetspeedPipeline.invokeNext(JetspeedPipeline.java:209)
at org.apache.jetspeed.security.impl.PasswordCredentialValveImpl.invoke(PasswordCredentialValveImpl.java:139)
at org.apache.jetspeed.pipeline.JetspeedPipeline.invokeNext(JetspeedPipeline.java:209)
at org.apache.jetspeed.security.impl.AbstractSecurityValve$1.run(AbstractSecurityValve.java:108)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAsPrivileged(Subject.java:437)
at org.apache.jetspeed.security.impl.AbstractSecurityValve.invoke(AbstractSecurityValve.java:102)
at org.apache.jetspeed.pipeline.JetspeedPipeline.invokeNext(JetspeedPipeline.java:209)
at org.apache.jetspeed.container.url.impl.PortalURLValveImpl.invoke(PortalURLValveImpl.java:55)
at org.apache.jetspeed.pipeline.JetspeedPipeline.invokeNext(JetspeedPipeline.java:209)
at org.apache.jetspeed.capabilities.impl.CapabilityValveImpl.invoke(CapabilityValveImpl.java:127)
at org.apache.jetspeed.pipeline.JetspeedPipeline.invokeNext(JetspeedPipeline.java:209)
at org.apache.jetspeed.localization.impl.LocalizationValveImpl.invoke(LocalizationValveImpl.java:73)
at org.apache.jetspeed.pipeline.JetspeedPipeline.invokeNext(JetspeedPipeline.java:209)
at org.apache.jetspeed.pipeline.JetspeedPipeline.invoke(JetspeedPipeline.java:191)
at org.apache.jetspeed.engine.AbstractEngine.service(AbstractEngine.java:259)
at org.apache.jetspeed.engine.JetspeedServlet.doGet(JetspeedServlet.java:225)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:118)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929)
at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
at java.lang.Thread.run(Thread.java:534)


I prefer it to work, or to produce an error message about the URL being out of date, but certainly not an exception.

Comments

Yup Ive seen that one before, but ONLY when you try to access the portal before the servlet has completely loaded and initialized. I just ran a few adhoc tests with old nav state (_ns) URLs from expired sessions (including your URL) and it was handled gracefully. Could this be because you hit the portal before it was started?

The demo version of J2 has quite a few webapps and takes time to get all loaded up depending on how fast your machine is

[Ate Douma]

Howard, this problem should be fixed with the new deployment model I committed some time ago.
Now only Tomcat is initializing new and existing Portlet Applications. Although you may still ran in
error messages like <Portlet> not available if you access the portal too quickly, this a a "normal"
error message and not a stacktrace dump anymore. Furthermore, if you refresh your page after all
portlet applications are started those portlets should become available again too.