JDK-8004919 : AnnotationSupport uses possibly half-constructed AnnotationType instances
- Type: Bug
- Component: core-libs
- Sub-Component: java.lang:reflect
- Priority: P3
- Status: Closed
- Resolution: Fixed
- Submitted: 2012-12-12
- Updated: 2013-08-06
- Resolved: 2013-01-31
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| JDK 8 |
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8 b77Fixed  |
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Description
In the sun.reflect.annotation.AnnotationSupport class the AnnotationType for a particular annotation class is not obtained via the synchronized getInstance() method, but incorrectly via direct unsynchronized read of Class.annotationType field. The code in AnnotationSupport can therefore dereference a half-constructed AnnotationType instance before it's constructor, executing in another thread, is finished and before final fields in object are frozen. Class.[get,set]AnnotationType should only be called from within the synchronized AnnotationType.getInstance method.
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