https://bz.apache.org/bugzilla/show_bug.cgi?id=57704
Bug ID: 57704
Summary: NullPointerException at
org.apache.catalina.core.StandardContext.listenerStop
Product: Tomcat 7
Version: 7.0.59
Hardware: PC
OS: Mac OS X 10.1
Status: NEW
Severity: normal
Priority: P2
Component: Catalina
Assignee: [email protected]
Reporter: [email protected]
During shutdown, tomcat crashes as follows:
SEVERE: Exception sending context destroyed event to listener instance of class
org.apache.tomcat.websocket.server.WsContextListener
java.lang.NullPointerException
at
org.apache.catalina.core.StandardContext.listenerStop(StandardContext.java:5076)
at
org.apache.catalina.core.StandardContext.stopInternal(StandardContext.java:5719)
at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:232)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:160)
at
org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)
at
org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)
at
org.apache.catalina.core.StandardHost.addChild(StandardHost.java:649)
at
org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:672)
at
org.apache.catalina.startup.HostConfig$DeployDescriptor.run(HostConfig.java:1859)
at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
An analysis of the code shows that getInstanceManager() is being called, and an
assumption is made that this call will always return not-null, which is not the
case. The rest of the code shows that there are valid situations where this
returns null.
5075 try {
5076 getInstanceManager().destroyInstance(listeners[j]);
5077 } catch (Throwable t) {
5078 t = ExceptionUtils.unwrapInvocationTargetException(t);
5079 ExceptionUtils.handleThrowable(t);
5080 getLogger().error
5081 (sm.getString("standardContext.listenerStop",
5082 listeners[j].getClass().getName()), t);
5083 ok = false;
5084 }
The fix should be a simple null check on or around line 5076.
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