Victor Lindberg:
When I access my liferay application:
java.lang.NullPointerException
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilter.getInvokerFilterChain(InvokerFilter.java:177)
at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilter.doFilter(InvokerFilter.java:64)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:225)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:999)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:565)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:307)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)
How can i solve that?
So, I am going to take a wild stab at this, because I just debugged an issue with the same NPE. It was because they were including their own copy of
portal-service.jar inside of their plugin's
WEB-INF/lib directory, which is a big no-no (because of Liferay's classloading mechanism, it will create instances of Liferay core classes using your plugin's classloader, instead of the Liferay/appserver one (which has its own copy of
portal-service.jar). There is stateful information inside classes, so your app ends up using uninintialized versions of many Liferay core classes, including the
InvokerServlet, thereby throwing the NPE. So check your build processes and ensure that your plugins never include
WEB-INF/lib/portal-service.jar).
