Eric Norman created SLING-9792:
----------------------------------
Summary: ScriptCache interaction with RhinoJavaScriptEngineFactory
is not thread safe
Key: SLING-9792
URL: https://issues.apache.org/jira/browse/SLING-9792
Project: Sling
Issue Type: Bug
Reporter: Eric Norman
Assignee: Eric Norman
Fix For: Scripting JavaScript 3.1.4
During startup, the RhinoJavaScriptEngineFactory component may become
deactivated temporarily. The ScriptCacheImpl#handleEvent (running in another
thread) may concurrently attempt to get the script engine from the factory. At
this point, the deactivated factory may still be in the engine list because it
hasn't been unbound from the ScriptEngineManager yet. In that case, the
RhinoJavaScriptEngineFactory#getScriptEngine call from
ScriptCacheImpl#handleEvent throws a series of NullPointerExceptions related to
usage of field that was nulled during the
RhinoJavaScriptEngineFactory#deactivate logic.
For example:
{noformat}
03.10.2020 12:10:41.244 *WARN* [EventAdminAsyncThread #2]
org.apache.sling.scripting.javascript.internal.RhinoJavaScriptEngineFactory
addHostObjects: Cannot prepare host object class
org.apache.sling.scripting.javascript.wrapper.ScriptableResource03.10.2020
12:10:41.244 *WARN* [EventAdminAsyncThread #2]
org.apache.sling.scripting.javascript.internal.RhinoJavaScriptEngineFactory
addHostObjects: Cannot prepare host object class
org.apache.sling.scripting.javascript.wrapper.ScriptableResourcejava.lang.NullPointerException:
null at
org.apache.sling.scripting.javascript.internal.RhinoJavaScriptEngineFactory.addHostObjects(RhinoJavaScriptEngineFactory.java:342)
[org.apache.sling.scripting.javascript:3.1.3.20201003190729678] at
org.apache.sling.scripting.javascript.internal.RhinoJavaScriptEngineFactory.getRootScope(RhinoJavaScriptEngineFactory.java:195)
[org.apache.sling.scripting.javascript:3.1.3.20201003190729678] at
org.apache.sling.scripting.javascript.internal.RhinoJavaScriptEngineFactory.getScriptEngine(RhinoJavaScriptEngineFactory.java:142)
[org.apache.sling.scripting.javascript:3.1.3.20201003190729678] at
org.apache.sling.scripting.core.impl.jsr223.SortableScriptEngineFactory.getScriptEngine(SortableScriptEngineFactory.java:120)
[org.apache.sling.scripting.core:2.3.5.SNAPSHOT] at
org.apache.sling.scripting.core.impl.ScriptCacheImpl.handleEvent(ScriptCacheImpl.java:283)
[org.apache.sling.scripting.core:2.3.5.SNAPSHOT] at
org.apache.felix.eventadmin.impl.handler.EventHandlerProxy.sendEvent(EventHandlerProxy.java:415)
at
org.apache.felix.eventadmin.impl.tasks.HandlerTask.runWithoutBlacklistTiming(HandlerTask.java:82)
[org.apache.felix.eventadmin:1.5.0] at
org.apache.felix.eventadmin.impl.tasks.SyncDeliverTasks.execute(SyncDeliverTasks.java:104)
[org.apache.felix.eventadmin:1.5.0] at
org.apache.felix.eventadmin.impl.tasks.AsyncDeliverTasks$TaskExecuter.run(AsyncDeliverTasks.java:166)
[org.apache.felix.eventadmin:1.5.0] at
java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) at
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at
java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:834)03.10.2020 12:10:41.247
*WARN* [EventAdminAsyncThread #2]
org.apache.sling.scripting.javascript.internal.RhinoJavaScriptEngineFactory
addHostObjects: Cannot prepare host object class
org.apache.sling.scripting.javascript.wrapper.ScriptableNodejava.lang.NullPointerException:
null at
org.apache.sling.scripting.javascript.internal.RhinoJavaScriptEngineFactory.addHostObjects(RhinoJavaScriptEngineFactory.java:342)
[org.apache.sling.scripting.javascript:3.1.3.20201003190729678] at
org.apache.sling.scripting.javascript.internal.RhinoJavaScriptEngineFactory.getRootScope(RhinoJavaScriptEngineFactory.java:195)
[org.apache.sling.scripting.javascript:3.1.3.20201003190729678] at
org.apache.sling.scripting.javascript.internal.RhinoJavaScriptEngineFactory.getScriptEngine(RhinoJavaScriptEngineFactory.java:142)
[org.apache.sling.scripting.javascript:3.1.3.20201003190729678] at
org.apache.sling.scripting.core.impl.jsr223.SortableScriptEngineFactory.getScriptEngine(SortableScriptEngineFactory.java:120)
[org.apache.sling.scripting.core:2.3.5.SNAPSHOT] at
org.apache.sling.scripting.core.impl.ScriptCacheImpl.handleEvent(ScriptCacheImpl.java:283)
[org.apache.sling.scripting.core:2.3.5.SNAPSHOT] at
org.apache.felix.eventadmin.impl.handler.EventHandlerProxy.sendEvent(EventHandlerProxy.java:415)
at
org.apache.felix.eventadmin.impl.tasks.HandlerTask.runWithoutBlacklistTiming(HandlerTask.java:82)
[org.apache.felix.eventadmin:1.5.0] at
org.apache.felix.eventadmin.impl.tasks.SyncDeliverTasks.execute(SyncDeliverTasks.java:104)
[org.apache.felix.eventadmin:1.5.0] at
org.apache.felix.eventadmin.impl.tasks.AsyncDeliverTasks$TaskExecuter.run(AsyncDeliverTasks.java:166)
[org.apache.felix.eventadmin:1.5.0] at
java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) at
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at
java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:834)03.10.2020 12:10:41.248
*WARN* [EventAdminAsyncThread #2]
org.apache.sling.scripting.javascript.internal.RhinoJavaScriptEngineFactory
addHostObjects: Cannot prepare host object class
org.apache.sling.scripting.javascript.wrapper.ScriptablePropertyjava.lang.NullPointerException:
null at
org.apache.sling.scripting.javascript.internal.RhinoJavaScriptEngineFactory.addHostObjects(RhinoJavaScriptEngineFactory.java:342)
[org.apache.sling.scripting.javascript:3.1.3.20201003190729678] at
org.apache.sling.scripting.javascript.internal.RhinoJavaScriptEngineFactory.getRootScope(RhinoJavaScriptEngineFactory.java:195)
[org.apache.sling.scripting.javascript:3.1.3.20201003190729678] at
org.apache.sling.scripting.javascript.internal.RhinoJavaScriptEngineFactory.getScriptEngine(RhinoJavaScriptEngineFactory.java:142)
[org.apache.sling.scripting.javascript:3.1.3.20201003190729678] at
org.apache.sling.scripting.core.impl.jsr223.SortableScriptEngineFactory.getScriptEngine(SortableScriptEngineFactory.java:120)
[org.apache.sling.scripting.core:2.3.5.SNAPSHOT] at
org.apache.sling.scripting.core.impl.ScriptCacheImpl.handleEvent(ScriptCacheImpl.java:283)
[org.apache.sling.scripting.core:2.3.5.SNAPSHOT] at
org.apache.felix.eventadmin.impl.handler.EventHandlerProxy.sendEvent(EventHandlerProxy.java:415)
at
org.apache.felix.eventadmin.impl.tasks.HandlerTask.runWithoutBlacklistTiming(HandlerTask.java:82)
[org.apache.felix.eventadmin:1.5.0] at
org.apache.felix.eventadmin.impl.tasks.SyncDeliverTasks.execute(SyncDeliverTasks.java:104)
[org.apache.felix.eventadmin:1.5.0] at
org.apache.felix.eventadmin.impl.tasks.AsyncDeliverTasks$TaskExecuter.run(AsyncDeliverTasks.java:166)
[org.apache.felix.eventadmin:1.5.0] at
java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) at
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at
java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:834)03.10.2020 12:10:41.249
*WARN* [EventAdminAsyncThread #2]
org.apache.sling.scripting.javascript.internal.RhinoJavaScriptEngineFactory
addHostObjects: Cannot prepare host object class
org.apache.sling.scripting.javascript.wrapper.ScriptableItemMapjava.lang.NullPointerException:
null at
org.apache.sling.scripting.javascript.internal.RhinoJavaScriptEngineFactory.addHostObjects(RhinoJavaScriptEngineFactory.java:348)
[org.apache.sling.scripting.javascript:3.1.3.20201003190729678] at
org.apache.sling.scripting.javascript.internal.RhinoJavaScriptEngineFactory.getRootScope(RhinoJavaScriptEngineFactory.java:195)
[org.apache.sling.scripting.javascript:3.1.3.20201003190729678] at
org.apache.sling.scripting.javascript.internal.RhinoJavaScriptEngineFactory.getScriptEngine(RhinoJavaScriptEngineFactory.java:142)
[org.apache.sling.scripting.javascript:3.1.3.20201003190729678] at
org.apache.sling.scripting.core.impl.jsr223.SortableScriptEngineFactory.getScriptEngine(SortableScriptEngineFactory.java:120)
[org.apache.sling.scripting.core:2.3.5.SNAPSHOT] at
org.apache.sling.scripting.core.impl.ScriptCacheImpl.handleEvent(ScriptCacheImpl.java:283)
[org.apache.sling.scripting.core:2.3.5.SNAPSHOT] at
org.apache.felix.eventadmin.impl.handler.EventHandlerProxy.sendEvent(EventHandlerProxy.java:415)
at
org.apache.felix.eventadmin.impl.tasks.HandlerTask.runWithoutBlacklistTiming(HandlerTask.java:82)
[org.apache.felix.eventadmin:1.5.0] at
org.apache.felix.eventadmin.impl.tasks.SyncDeliverTasks.execute(SyncDeliverTasks.java:104)
[org.apache.felix.eventadmin:1.5.0] at
org.apache.felix.eventadmin.impl.tasks.AsyncDeliverTasks$TaskExecuter.run(AsyncDeliverTasks.java:166)
[org.apache.felix.eventadmin:1.5.0] at
java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) at
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at
java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:834)03.10.2020 12:10:41.250
*WARN* [EventAdminAsyncThread #2]
org.apache.sling.scripting.javascript.internal.RhinoJavaScriptEngineFactory
addHostObjects: Cannot prepare host object class
org.apache.sling.scripting.javascript.wrapper.ScriptablePrintWriterjava.lang.NullPointerException:
null at
org.apache.sling.scripting.javascript.internal.RhinoJavaScriptEngineFactory.addHostObjects(RhinoJavaScriptEngineFactory.java:342)
[org.apache.sling.scripting.javascript:3.1.3.20201003190729678] at
org.apache.sling.scripting.javascript.internal.RhinoJavaScriptEngineFactory.getRootScope(RhinoJavaScriptEngineFactory.java:195)
[org.apache.sling.scripting.javascript:3.1.3.20201003190729678] at
org.apache.sling.scripting.javascript.internal.RhinoJavaScriptEngineFactory.getScriptEngine(RhinoJavaScriptEngineFactory.java:142)
[org.apache.sling.scripting.javascript:3.1.3.20201003190729678] at
org.apache.sling.scripting.core.impl.jsr223.SortableScriptEngineFactory.getScriptEngine(SortableScriptEngineFactory.java:120)
[org.apache.sling.scripting.core:2.3.5.SNAPSHOT] at
org.apache.sling.scripting.core.impl.ScriptCacheImpl.handleEvent(ScriptCacheImpl.java:283)
[org.apache.sling.scripting.core:2.3.5.SNAPSHOT] at
org.apache.felix.eventadmin.impl.handler.EventHandlerProxy.sendEvent(EventHandlerProxy.java:415)
at
org.apache.felix.eventadmin.impl.tasks.HandlerTask.runWithoutBlacklistTiming(HandlerTask.java:82)
[org.apache.felix.eventadmin:1.5.0] at
org.apache.felix.eventadmin.impl.tasks.SyncDeliverTasks.execute(SyncDeliverTasks.java:104)
[org.apache.felix.eventadmin:1.5.0] at
org.apache.felix.eventadmin.impl.tasks.AsyncDeliverTasks$TaskExecuter.run(AsyncDeliverTasks.java:166)
[org.apache.felix.eventadmin:1.5.0] at
java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) at
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at
java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:834)03.10.2020 12:10:41.251
*WARN* [EventAdminAsyncThread #2]
org.apache.sling.scripting.javascript.internal.RhinoJavaScriptEngineFactory
addHostObjects: Cannot prepare host object class
org.apache.sling.scripting.javascript.wrapper.ScriptableVersionHistoryjava.lang.NullPointerException:
null at
org.apache.sling.scripting.javascript.internal.RhinoJavaScriptEngineFactory.addHostObjects(RhinoJavaScriptEngineFactory.java:342)
[org.apache.sling.scripting.javascript:3.1.3.20201003190729678] at
org.apache.sling.scripting.javascript.internal.RhinoJavaScriptEngineFactory.getRootScope(RhinoJavaScriptEngineFactory.java:195)
[org.apache.sling.scripting.javascript:3.1.3.20201003190729678] at
org.apache.sling.scripting.javascript.internal.RhinoJavaScriptEngineFactory.getScriptEngine(RhinoJavaScriptEngineFactory.java:142)
[org.apache.sling.scripting.javascript:3.1.3.20201003190729678] at
org.apache.sling.scripting.core.impl.jsr223.SortableScriptEngineFactory.getScriptEngine(SortableScriptEngineFactory.java:120)
[org.apache.sling.scripting.core:2.3.5.SNAPSHOT] at
org.apache.sling.scripting.core.impl.ScriptCacheImpl.handleEvent(ScriptCacheImpl.java:283)
[org.apache.sling.scripting.core:2.3.5.SNAPSHOT] at
org.apache.felix.eventadmin.impl.handler.EventHandlerProxy.sendEvent(EventHandlerProxy.java:415)
at
org.apache.felix.eventadmin.impl.tasks.HandlerTask.runWithoutBlacklistTiming(HandlerTask.java:82)
[org.apache.felix.eventadmin:1.5.0] at
org.apache.felix.eventadmin.impl.tasks.SyncDeliverTasks.execute(SyncDeliverTasks.java:104)
[org.apache.felix.eventadmin:1.5.0] at
org.apache.felix.eventadmin.impl.tasks.AsyncDeliverTasks$TaskExecuter.run(AsyncDeliverTasks.java:166)
[org.apache.felix.eventadmin:1.5.0] at
java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) at
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at
java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:834)03.10.2020 12:10:41.251
*WARN* [EventAdminAsyncThread #2]
org.apache.sling.scripting.javascript.internal.RhinoJavaScriptEngineFactory
addHostObjects: Cannot prepare host object class
org.apache.sling.scripting.javascript.wrapper.ScriptableVersionjava.lang.NullPointerException:
null at
org.apache.sling.scripting.javascript.internal.RhinoJavaScriptEngineFactory.addHostObjects(RhinoJavaScriptEngineFactory.java:342)
[org.apache.sling.scripting.javascript:3.1.3.20201003190729678] at
org.apache.sling.scripting.javascript.internal.RhinoJavaScriptEngineFactory.getRootScope(RhinoJavaScriptEngineFactory.java:195)
[org.apache.sling.scripting.javascript:3.1.3.20201003190729678] at
org.apache.sling.scripting.javascript.internal.RhinoJavaScriptEngineFactory.getScriptEngine(RhinoJavaScriptEngineFactory.java:142)
[org.apache.sling.scripting.javascript:3.1.3.20201003190729678] at
org.apache.sling.scripting.core.impl.jsr223.SortableScriptEngineFactory.getScriptEngine(SortableScriptEngineFactory.java:120)
[org.apache.sling.scripting.core:2.3.5.SNAPSHOT] at
org.apache.sling.scripting.core.impl.ScriptCacheImpl.handleEvent(ScriptCacheImpl.java:283)
[org.apache.sling.scripting.core:2.3.5.SNAPSHOT] at
org.apache.felix.eventadmin.impl.handler.EventHandlerProxy.sendEvent(EventHandlerProxy.java:415)
at
org.apache.felix.eventadmin.impl.tasks.HandlerTask.runWithoutBlacklistTiming(HandlerTask.java:82)
[org.apache.felix.eventadmin:1.5.0] at
org.apache.felix.eventadmin.impl.tasks.SyncDeliverTasks.execute(SyncDeliverTasks.java:104)
[org.apache.felix.eventadmin:1.5.0] at
org.apache.felix.eventadmin.impl.tasks.AsyncDeliverTasks$TaskExecuter.run(AsyncDeliverTasks.java:166)
[org.apache.felix.eventadmin:1.5.0] at
java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) at
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at
java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:834)03.10.2020 12:10:41.252
*WARN* [EventAdminAsyncThread #2]
org.apache.sling.scripting.javascript.internal.RhinoJavaScriptEngineFactory
addHostObjects: Cannot prepare host object class
org.apache.sling.scripting.javascript.wrapper.ScriptableCalendarjava.lang.NullPointerException:
null at
org.apache.sling.scripting.javascript.internal.RhinoJavaScriptEngineFactory.addHostObjects(RhinoJavaScriptEngineFactory.java:342)
[org.apache.sling.scripting.javascript:3.1.3.20201003190729678] at
org.apache.sling.scripting.javascript.internal.RhinoJavaScriptEngineFactory.getRootScope(RhinoJavaScriptEngineFactory.java:195)
[org.apache.sling.scripting.javascript:3.1.3.20201003190729678] at
org.apache.sling.scripting.javascript.internal.RhinoJavaScriptEngineFactory.getScriptEngine(RhinoJavaScriptEngineFactory.java:142)
[org.apache.sling.scripting.javascript:3.1.3.20201003190729678] at
org.apache.sling.scripting.core.impl.jsr223.SortableScriptEngineFactory.getScriptEngine(SortableScriptEngineFactory.java:120)
[org.apache.sling.scripting.core:2.3.5.SNAPSHOT] at
org.apache.sling.scripting.core.impl.ScriptCacheImpl.handleEvent(ScriptCacheImpl.java:283)
[org.apache.sling.scripting.core:2.3.5.SNAPSHOT] at
org.apache.felix.eventadmin.impl.handler.EventHandlerProxy.sendEvent(EventHandlerProxy.java:415)
at
org.apache.felix.eventadmin.impl.tasks.HandlerTask.runWithoutBlacklistTiming(HandlerTask.java:82)
[org.apache.felix.eventadmin:1.5.0] at
org.apache.felix.eventadmin.impl.tasks.SyncDeliverTasks.execute(SyncDeliverTasks.java:104)
[org.apache.felix.eventadmin:1.5.0] at
org.apache.felix.eventadmin.impl.tasks.AsyncDeliverTasks$TaskExecuter.run(AsyncDeliverTasks.java:166)
[org.apache.felix.eventadmin:1.5.0] at
java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) at
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at
java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:834)03.10.2020 12:10:41.253
*WARN* [EventAdminAsyncThread #2]
org.apache.sling.scripting.javascript.internal.RhinoJavaScriptEngineFactory
addHostObjects: Cannot prepare host object class
org.apache.sling.scripting.javascript.wrapper.ScriptableMapjava.lang.NullPointerException:
null at
org.apache.sling.scripting.javascript.internal.RhinoJavaScriptEngineFactory.addHostObjects(RhinoJavaScriptEngineFactory.java:342)
[org.apache.sling.scripting.javascript:3.1.3.20201003190729678] at
org.apache.sling.scripting.javascript.internal.RhinoJavaScriptEngineFactory.getRootScope(RhinoJavaScriptEngineFactory.java:195)
[org.apache.sling.scripting.javascript:3.1.3.20201003190729678] at
org.apache.sling.scripting.javascript.internal.RhinoJavaScriptEngineFactory.getScriptEngine(RhinoJavaScriptEngineFactory.java:142)
[org.apache.sling.scripting.javascript:3.1.3.20201003190729678] at
org.apache.sling.scripting.core.impl.jsr223.SortableScriptEngineFactory.getScriptEngine(SortableScriptEngineFactory.java:120)
[org.apache.sling.scripting.core:2.3.5.SNAPSHOT] at
org.apache.sling.scripting.core.impl.ScriptCacheImpl.handleEvent(ScriptCacheImpl.java:283)
[org.apache.sling.scripting.core:2.3.5.SNAPSHOT] at
org.apache.felix.eventadmin.impl.handler.EventHandlerProxy.sendEvent(EventHandlerProxy.java:415)
at
org.apache.felix.eventadmin.impl.tasks.HandlerTask.runWithoutBlacklistTiming(HandlerTask.java:82)
[org.apache.felix.eventadmin:1.5.0] at
org.apache.felix.eventadmin.impl.tasks.SyncDeliverTasks.execute(SyncDeliverTasks.java:104)
[org.apache.felix.eventadmin:1.5.0] at
org.apache.felix.eventadmin.impl.tasks.AsyncDeliverTasks$TaskExecuter.run(AsyncDeliverTasks.java:166)
[org.apache.felix.eventadmin:1.5.0] at
java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) at
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at
java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:834)
{noformat}
Expected:
RhinoJavaScriptEngineFactory#getScriptEngine should log a warning and return
null if the component is no longer active. The series of NPEs should not
happen and get logged.
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