Functor singleton classes do not implement singleton pattern correctly
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Key: COLLECTIONS-343
URL: https://issues.apache.org/jira/browse/COLLECTIONS-343
Project: Commons Collections
Issue Type: Bug
Components: Functor
Reporter: Goran Hacek
Fix For: 4.0
All classes in package "org.apache.commons.collections.functors" that advertise
that they have singleton instance actually cannot guarantee that. Because of
serialization support multiple instances of those classes can exist at runtime.
Following classes are making this false claim:
* CloneTransformer
* ExceptionClosure
* ExceptionFactory
* ExceptionPredicate
* ExceptionTransformer
* FalsePredicate
* NOPClosure
* NOPTransformer
* NotNullPredicate
* NullPredicate
* StringValueTransformer
* TruePredicate
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