NullPointerException in InvokerFilter

[Victor Lindberg，修改在11 年前。]

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?

[Mika Koivisto，修改在11 年前。]

Too little information to even start beginning to guess what could be the cause. You should post the full stacktrace and Liferay version you are using. Have you added any custom filters or filter hooks?

[James Falkner，修改在10 年前。]

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).

[Mika Koivisto，修改在10 年前。]

Good catch James. That would definitely cause that. Never ever copy portal-service.jar or portal-impl.jar into your plugin.

[Aleksey Korolev，修改在8 年前。]

I'm on latest Liferay 6.2 ga6 and was getting the same error. It took me some time to realize that this was due to inclusionn of Liferay API as a dependency into my project' pom file:
<dependency>
<groupId>com.liferay.portal</groupId>
<artifactId>com.liferay.portal.kernel</artifactId>
<version>2.0.0</version>
</dependency>

It would be nice to have better error handling for such case and provide some clues about the reason of the error.
For example check ClassLoader of some class, e.g. InvokerFilter, on startup and printing error if "wrong" classloader is detected.