Expand my Community achievements bar.

Guidelines for the Responsible Use of Generative AI in the Experience Cloud Community.

Custom Eventlistener failed to activate

Avatar

Level 4

Following is error

Path : http://localhost:4502/system/console/components/4324

Error:

java.lang.NullPointerException at xxxxxx.core.listeners.SearchPageTagListener.activate(SearchPageTagListener.java:42) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base/java.lang.reflect.Method.invoke(Method.java:566) at org.apache.felix.scr.impl.inject.methods.BaseMethod.invokeMethod(BaseMethod.java:242) at org.apache.felix.scr.impl.inject.methods.BaseMethod.access$500(BaseMethod.java:41) at org.apache.felix.scr.impl.inject.methods.BaseMethod$Resolved.invoke(BaseMethod.java:678) at org.apache.felix.scr.impl.inject.methods.BaseMethod.invoke(BaseMethod.java:524) at org.apache.felix.scr.impl.inject.methods.ActivateMethod.invoke(ActivateMethod.java:318) at org.apache.felix.scr.impl.inject.methods.ActivateMethod.invoke(ActivateMethod.java:308) at org.apache.felix.scr.impl.manager.SingleComponentManager.createImplementationObject(SingleComponentManager.java:342) at org.apache.felix.scr.impl.manager.SingleComponentManager.createComponent(SingleComponentManager.java:115) at org.apache.felix.scr.impl.manager.SingleComponentManager.getService(SingleComponentManager.java:984) at org.apache.felix.scr.impl.manager.SingleComponentManager.getServiceInternal(SingleComponentManager.java:957) at org.apache.felix.scr.impl.manager.AbstractComponentManager.activateInternal(AbstractComponentManager.java:757) at org.apache.felix.scr.impl.manager.DependencyManager$SingleStaticCustomizer.addedService(DependencyManager.java:1091) at org.apache.felix.scr.impl.manager.DependencyManager$SingleStaticCustomizer.addedService(DependencyManager.java:1043) at org.apache.felix.scr.impl.manager.ServiceTracker$Tracked.customizerAdded(ServiceTracker.java:1216) at org.apache.felix.scr.impl.manager.ServiceTracker$Tracked.customizerAdded(ServiceTracker.java:1137) at org.apache.felix.scr.impl.manager.ServiceTracker$AbstractTracked.trackAdding(ServiceTracker.java:944) at org.apache.felix.scr.impl.manager.ServiceTracker$AbstractTracked.track(ServiceTracker.java:880) at org.apache.felix.scr.impl.manager.ServiceTracker$Tracked.serviceChanged(ServiceTracker.java:1168) at org.apache.felix.scr.impl.BundleComponentActivator$ListenerInfo.serviceChanged(BundleComponentActivator.java:125) at org.apache.felix.framework.EventDispatcher.invokeServiceListenerCallback(EventDispatcher.java:990) at org.apache.felix.framework.EventDispatcher.fireEventImmediately(EventDispatcher.java:838) at org.apache.felix.framework.EventDispatcher.fireServiceEvent(EventDispatcher.java:545) at org.apache.felix.framework.Felix.fireServiceEvent(Felix.java:4833) at org.apache.felix.framework.Felix.registerService(Felix.java:3804) at org.apache.felix.framework.BundleContextImpl.registerService(BundleContextImpl.java:328) at org.apache.felix.scr.impl.manager.AbstractComponentManager$3.register(AbstractComponentManager.java:907) at org.apache.felix.scr.impl.manager.AbstractComponentManager$3.register(AbstractComponentManager.java:893) at org.apache.felix.scr.impl.manager.RegistrationManager.changeRegistration(RegistrationManager.java:128) at org.apache.felix.scr.impl.manager.AbstractComponentManager.registerService(AbstractComponentManager.java:960) at org.apache.felix.scr.impl.manager.AbstractComponentManager.activateInternal(AbstractComponentManager.java:733) at org.apache.felix.scr.impl.manager.AbstractComponentManager.enableInternal(AbstractComponentManager.java:667) at org.apache.felix.scr.impl.manager.AbstractComponentManager.enable(AbstractComponentManager.java:433) at org.apache.felix.scr.impl.manager.ConfigurableComponentHolder.enableComponents(ConfigurableComponentHolder.java:666) at org.apache.felix.scr.impl.BundleComponentActivator.initialEnable(BundleComponentActivator.java:353) at org.apache.felix.scr.impl.Activator.loadComponents(Activator.java:553) at org.apache.felix.scr.impl.Activator.access$200(Activator.java:69) at org.apache.felix.scr.impl.Activator$ScrExtension.start(Activator.java:424) at org.apache.felix.scr.impl.AbstractExtender.createExtension(AbstractExtender.java:196) at org.apache.felix.scr.impl.AbstractExtender.modifiedBundle(AbstractExtender.java:169) at org.apache.felix.scr.impl.AbstractExtender.modifiedBundle(AbstractExtender.java:49) at org.osgi.util.tracker.BundleTracker$Tracked.customizerModified(BundleTracker.java:488) at org.osgi.util.tracker.BundleTracker$Tracked.customizerModified(BundleTracker.java:420) at org.osgi.util.tracker.AbstractTracked.track(AbstractTracked.java:232) at org.osgi.util.tracker.BundleTracker$Tracked.bundleChanged(BundleTracker.java:450) at org.apache.felix.framework.EventDispatcher.invokeBundleListenerCallback(EventDispatcher.java:915) at org.apache.felix.framework.EventDispatcher.fireEventImmediately(EventDispatcher.java:834) at org.apache.felix.framework.EventDispatcher.fireBundleEvent(EventDispatcher.java:516) at org.apache.felix.framework.Felix.fireBundleEvent(Felix.java:4817) at org.apache.felix.framework.Felix.startBundle(Felix.java:2336) at org.apache.felix.framework.BundleImpl.start(BundleImpl.java:998) at org.apache.felix.webconsole.internal.core.BaseUpdateInstallHelper.run(BaseUpdateInstallHelper.java:198) at java.base/java.lang.Thread.run(Thread.java:836)

2 Replies

Avatar

Community Advisor

Hi @sangrampatil111 ,

I hope you are writing a Custom Event Listener with the help of the Observation Manager and also Referencing classes NativeMethodAccessorImpl and DelegatingMethodAccessorImpl.

Please check the service which you are referencing must be active.

You can also check the below article for Custom Event Listener Implementation :

If the issue still persists please elaborate or share the snippet code.

Hope this could help you !!!

Regards

Shiv

 

 

Shiv Prakash

Thanks @Shiv_Prakash_Patel ,

 

I tried everything you mentioned. But it seems dependency issue.

I am getting following error in OSGI console.

HTTP ERROR 404 Not Found

URI: /system/console/components/4267
STATUS: 404
MESSAGE: Not Found
SERVLET: org.apache.felix.http.base.internal.dispatch.DispatcherServlet-c17cee53