JDK-8062771 : Core reflection should use final fields whenever possible
- Type: Bug
- Component: core-libs
- Sub-Component: java.lang:reflect
- Priority: P3
- Status: Closed
- Resolution: Fixed
- OS: generic
- CPU: generic
- Submitted: 2014-11-03
- Updated: 2015-06-04
- Resolved: 2014-11-07
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| JDK 7 | JDK 8 | JDK 9 |
|---|---|---|
7u80Fixed  |
8u40Fixed |
9 b40Fixed |
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Description
We experienced very rare NullPointerExceptions in core reflection in jdk7, like this: * at sun.reflect.generics.visitor.Reifier.visitClassTypeSignature(Reifier.java:125) * at sun.reflect.generics.tree.ClassTypeSignature.accept(ClassTypeSignature.java:49) * at sun.reflect.generics.repository.ClassRepository.getSuperclass(ClassRepository.java:84) * at java.lang.Class.getGenericSuperclass(Class.java:692) * at com.google.inject.TypeLiteral.getSuperclassTypeParameter(TypeLiteral.java:99) * at com.google.inject.TypeLiteral.<init>(TypeLiteral.java:79) while experimenting with fixes, we were surprised to discover that making reflection class fields final fixed the problem - that's never happened before on x86 in my memory. Although it's not reproducible on jdk8+, apparently because of the fix in 8016236: Class.getGenericInterfaces performance improvement (which is also a correctness improvement!) we should preserve our work in jdk9 as well.
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