Hi,
I have built a small plugin system with OSGi. Every plugin-bundle
registers a PluginService. Now I would like to validate the
registered/started plugin bundles/services. For example I would like to
check if an icon is available within the bundle classpath.
I tried to implement a ServiceTracker which validates the bundle on
"ServiceTracker.addingService(...)" and when the validation is failed,
the validated bundle gets stopped via
"Bundle.stop(Bundle.STOP_TRANSIENT)". This does work in some cases, but
sometimes Felix throws a NullPointerException.
Maybe it is not the best solution to stop the bundles within a
ServiceTracker. Is there another way to implement a validation mechanizm?
Thank you in advance.
Here is the NullPointerException which is sometimes thrown by Felix.
ERROR: Bundle org.apache.felix.bundlerepository [26] EventDispatcher:
Error during dispatch. (java.lang.NullPointerException)
java.lang.NullPointerException
at
org.apache.felix.bundlerepository.impl.LocalRepositoryImpl.serviceChanged(LocalRepositoryImpl.java:71)
at
org.apache.felix.framework.util.EventDispatcher.invokeServiceListenerCallback(EventDispatcher.java:932)
at
org.apache.felix.framework.util.EventDispatcher.fireEventImmediately(EventDispatcher.java:793)
at
org.apache.felix.framework.util.EventDispatcher.fireServiceEvent(EventDispatcher.java:543)
at org.apache.felix.framework.Felix.fireServiceEvent(Felix.java:4252)
at org.apache.felix.framework.Felix.registerService(Felix.java:3275)
at
org.apache.felix.framework.BundleContextImpl.registerService(BundleContextImpl.java:346)
at
org.apache.felix.scr.impl.manager.AbstractComponentManager.registerService(AbstractComponentManager.java:449)
at
org.apache.felix.scr.impl.manager.AbstractComponentManager.registerComponentService(AbstractComponentManager.java:460)
at
org.apache.felix.scr.impl.manager.AbstractComponentManager$Unsatisfied.activate(AbstractComponentManager.java:1009)
at
org.apache.felix.scr.impl.manager.AbstractComponentManager.activateInternal(AbstractComponentManager.java:333)
at
org.apache.felix.scr.impl.manager.AbstractComponentManager.enable(AbstractComponentManager.java:157)
at
org.apache.felix.scr.impl.config.ConfiguredComponentHolder.enableComponents(ConfiguredComponentHolder.java:256)
at
org.apache.felix.scr.impl.BundleComponentActivator.loadDescriptor(BundleComponentActivator.java:253)
at
org.apache.felix.scr.impl.BundleComponentActivator.initialize(BundleComponentActivator.java:147)
at
org.apache.felix.scr.impl.BundleComponentActivator.<init>(BundleComponentActivator.java:111)
at
org.apache.felix.scr.impl.Activator.loadComponents(Activator.java:285)
at
org.apache.felix.scr.impl.Activator.bundleChanged(Activator.java:203)
at
org.apache.felix.framework.util.EventDispatcher.invokeBundleListenerCallback(EventDispatcher.java:868)
at
org.apache.felix.framework.util.EventDispatcher.fireEventImmediately(EventDispatcher.java:789)
at
org.apache.felix.framework.util.EventDispatcher.fireBundleEvent(EventDispatcher.java:514)
at org.apache.felix.framework.Felix.fireBundleEvent(Felix.java:4236)
at org.apache.felix.framework.Felix.startBundle(Felix.java:1923)
at
org.apache.felix.framework.Felix.setActiveStartLevel(Felix.java:1191)
at
org.apache.felix.framework.FrameworkStartLevelImpl.run(FrameworkStartLevelImpl.java:295)
at java.lang.Thread.run(Thread.java:662)
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