f2par0 opened a new pull request, #338:
URL: https://github.com/apache/karaf-decanter/pull/338
`subject.getPrincipals()` returns a synchronized SecureSet but the iterator
in `principals` must be protected by a synchronization on the `Set` otherwise,
if the Set is modified during iteration, it can lead to this exception :
```
java.util.ConcurrentModificationException: null
at
java.util.LinkedList$ListItr.checkForComodification(LinkedList.java:970) ~[?:?]
at java.util.LinkedList$ListItr.next(LinkedList.java:892) ~[?:?]
at javax.security.auth.Subject$SecureSet$1.next(Subject.java:1082) ~[?:?]
at
org.apache.karaf.decanter.collector.eventadmin.EventCollector.convertSubject(EventCollector.java:84)
~[?:?]
at
org.apache.karaf.decanter.collector.eventadmin.EventCollector.handleEvent(EventCollector.java:64)
~[?:?]
at
org.apache.felix.eventadmin.impl.handler.EventHandlerProxy.sendEvent(EventHandlerProxy.java:432)
~[?:?]
at
org.apache.felix.eventadmin.impl.tasks.HandlerTask.runWithoutDenylistTiming(HandlerTask.java:82)
~[?:?]
at
org.apache.felix.eventadmin.impl.tasks.SyncDeliverTasks.execute(SyncDeliverTasks.java:107)
~[?:?]
at
org.apache.felix.eventadmin.impl.tasks.AsyncDeliverTasks$TaskExecuter.run(AsyncDeliverTasks.java:167)
~[?:?]
at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515) ~[?:?]
at java.util.concurrent.FutureTask.run(FutureTask.java:264) ~[?:?]
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
~[?:?]
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
~[?:?]
at java.lang.Thread.run(Thread.java:829) ~[?:?]
```
One way to cause the problem is to activate the event monitoring and
webconsole and call repeatedly the webconsole
```
for i in {1..100}; do (curl -u karaf:karaf
http://localhost:8040/system/console/bundles ) && (curl -u tadmin:tadmin
http://localhost:8040/system/console/bundles ) done
```
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