Class fields set by ctors should be final if they don't need to be changed later
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Key: CONFIGURATION-485
URL: https://issues.apache.org/jira/browse/CONFIGURATION-485
Project: Commons Configuration
Issue Type: Improvement
Reporter: Sebb
Using final whereever possible simplifies testing (fewer possible states) and
improves thread-safety (final fields may not need synch.)
Obviously changing public or protected fields to final may cause problems for
binary compatibility (if they form part of the public API), but for
private/package variables that is not a concern.
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