NullPointerException at org.apache.aries.subsystem.core.internal.WovenClassListener.modified at org.apache.aries.subsystem.core.internal.RegionUpdater.addRequirements

A NullPointerException [1] may occur while updating a region as part of adding dynamic imports to the sharing policy for a bundle containing a woven class. This will only occur when something outside of the subsystems implementation for whatever reason has deleted the region digraph edge that connects the parent subsystem to the subsystem containing the bundle whose class is being woven as a constituent.

Still, it would be useful if the implementation would allow this by replacing the NPE with a noop. In other words, if the implementation does not find an existing edge between parent and child, it would simply assume that something else is handling the dynamic imports.

[1]
org.osgi.service.subsystem.SubsystemException: java.lang.NullPointerException
at org.apache.aries.subsystem.core.internal.WovenClassListener.modified(WovenClassListener.java:125)
at org.eclipse.osgi.internal.weaving.WovenClassImpl$1.call(WovenClassImpl.java:203)
at org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.notifyHookPrivileged(ServiceRegistry.java:1280)
at org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.notifyHooksPrivileged(ServiceRegistry.java:1263)
at org.eclipse.osgi.internal.weaving.WovenClassImpl.notifyWovenClassListeners(WovenClassImpl.java:220)
at org.eclipse.osgi.internal.weaving.WovenClassImpl.callHooks(WovenClassImpl.java:271)
at org.eclipse.osgi.internal.weaving.WeavingHookConfigurator.processClass(WeavingHookConfigurator.java:56)
at org.eclipse.osgi.internal.loader.classpath.ClasspathManager.defineClass(ClasspathManager.java:616)
at org.eclipse.osgi.internal.loader.classpath.ClasspathManager.findClassImpl(ClasspathManager.java:588)
at org.eclipse.osgi.internal.loader.classpath.ClasspathManager.findLocalClassImpl(ClasspathManager.java:540)
at org.eclipse.osgi.internal.loader.classpath.ClasspathManager.findLocalClass(ClasspathManager.java:527)
at org.eclipse.osgi.internal.loader.ModuleClassLoader.findLocalClass(ModuleClassLoader.java:324)
at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:330)
at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:407)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:357)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:349)
at org.eclipse.osgi.internal.framework.BundleContextImpl.loadBundleActivator(BundleContextImpl.java:757)
at org.eclipse.osgi.internal.framework.BundleContextImpl.start(BundleContextImpl.java:711)
at org.eclipse.osgi.internal.framework.EquinoxBundle.startWorker0(EquinoxBundle.java:951)
at org.eclipse.osgi.internal.framework.EquinoxBundle$EquinoxModule.startWorker(EquinoxBundle.java:328)
at org.eclipse.osgi.container.Module.doStart(Module.java:566)
at org.eclipse.osgi.container.Module.start(Module.java:434)
at org.eclipse.osgi.internal.framework.EquinoxBundle.start(EquinoxBundle.java:402)
at org.apache.aries.subsystem.core.internal.StartAction.startBundleResource(StartAction.java:337)
at org.apache.aries.subsystem.core.internal.StartAction.startResource(StartAction.java:365)
at org.apache.aries.subsystem.core.internal.StartAction.run(StartAction.java:128)
at java.security.AccessController.doPrivileged(Native Method)
at org.apache.aries.subsystem.core.internal.BasicSubsystem.start(BasicSubsystem.java:295)
...
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException
at org.apache.aries.subsystem.core.internal.RegionUpdater.addRequirements(RegionUpdater.java:106)
at org.apache.aries.subsystem.core.internal.RegionUpdater.addRequirements(RegionUpdater.java:60)
at org.apache.aries.subsystem.core.internal.WovenClassListener.modified(WovenClassListener.java:122)
... 39 more