Race condition in EntityFiltering

[jansupol]

The symptom is that when an entity filtering is used, only some fields are returned, not all selected.

The log can contain an exception:

Caused by:
|java.util.ConcurrentModificationException
| at java.util.HashMap$HashIterator.nextNode(HashMap.java:1437)
| at java.util.HashMap$EntryIterator.next(HashMap.java:1471)
| at java.util.HashMap$EntryIterator.next(HashMap.java:1469)
| at org.glassfish.jersey.internal.guava.AbstractMapBasedMultimap$AsMap$AsMapIterator.next(AbstractMapBasedMultimap.java:1348)
| at org.glassfish.jersey.internal.guava.AbstractMapBasedMultimap$AsMap$AsMapIterator.next(AbstractMapBasedMultimap.java:1336)
| at org.glassfish.jersey.internal.guava.TransformedIterator.next(TransformedIterator.java:45)
| at org.glassfish.jersey.internal.guava.AbstractMultimap.containsValue(AbstractMultimap.java:41)
| at org.glassfish.jersey.internal.guava.HashMultimap.containsValue(HashMultimap.java:44)
| at org.glassfish.jersey.message.filtering.EntityGraphImpl.presentInScopes(EntityGraphImpl.java:205)
| at org.glassfish.jersey.message.filtering.DefaultEntityProcessor.process(DefaultEntityProcessor.java:95)
| at org.glassfish.jersey.message.filtering.DefaultEntityProcessor.process(DefaultEntityProcessor.java:79)
| at org.glassfish.jersey.message.filtering.EntityInspectorImpl.inspectEntityProperties(EntityInspectorImpl.java:173)
| at org.glassfish.jersey.message.filtering.EntityInspectorImpl.inspect(EntityInspectorImpl.java:104)
| at org.glassfish.jersey.message.filtering.spi.AbstractObjectProvider.getFilteringObject (AbstractObjectProvider.java:90)

[jansupol]

When EntityInspectorImpl.inspect is called, two threads can start to populate the EntityGraph leading to the exception.

Also, if a first thread is still populating the EntityGraph, another thread can invoke the method,
graphProvider.containsEntityGraph will return true, the thread can create an ObjectGraph from the not fully populated EntityGraph in AbstractObjectProvider#getFilteringObject.