Make PolicySubject of AxisDescription thread-safe
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Key: AXIS2-4179
URL: https://issues.apache.org/jira/browse/AXIS2-4179
Project: Axis 2.0 (Axis2)
Issue Type: Improvement
Reporter: Nandana Mihindukulasooriya
Assignee: Nandana Mihindukulasooriya
Each AxisDescription instance (AxisService, AxisOperation, etc.) has a
"PolicySubject" field containing the policy components (policy, policy
reference) attached at that subject. The problem is that this PolicySubject
class is not thread safe - it maintains a HashMap with all policy components
(mapped by their id). So when users are somehow modifying the policy of a
subject (attaching new components or removing some) if meanwhile a service
execution calls MessageContext.getEffectivePolicy(), which iterates over the
policy components, a ConcurrentModificationException is thrown. In that case
the service invocation will fail and a fault will be send to the client.
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