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https://issues.apache.org/jira/browse/OPENJPA-2205?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13287574#comment-13287574
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James Carman commented on OPENJPA-2205:
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Details about the FindBugs error:
Using new Integer(int) is guaranteed to always result in a new object whereas
Integer.valueOf(int) allows caching of values to be done by the compiler, class
library, or JVM. Using of cached values avoids object allocation and the code
will be faster.
Values between -128 and 127 are guaranteed to have corresponding cached
instances and using valueOf is approximately 3.5 times faster than using
constructor. For values outside the constant range the performance of both
styles is the same.
Unless the class must be compatible with JVMs predating Java 1.5, use either
autoboxing or the valueOf() method when creating instances of Long, Integer,
Short, Character, and Byte.
> Performance - Method invokes inefficient Number constructor; use static
> valueOf instead
> ---------------------------------------------------------------------------------------
>
> Key: OPENJPA-2205
> URL: https://issues.apache.org/jira/browse/OPENJPA-2205
> Project: OpenJPA
> Issue Type: Bug
> Components: Enhance
> Affects Versions: 2.2.0
> Reporter: James Carman
>
> We use Sonar and all of our enhanced classes cause this "critical" bug to
> come up. I believe it's found via FindBugs.
> The pcCopyKeyFieldsFromObjectId() method appears to be the offender here.
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