[LUCENE-5704] Compile error in various DocValues formats with Java 8u20

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 4.8.1
• Fix Version/s: 4.9, 6.0
• Component/s: core/index
• Labels: Java8
• Lucene Fields: New
• Assignee: Uwe Schindler
• Reporter: Uwe Schindler
• Created: 24/May/14 13:50
• Updated: 28/Aug/22 14:08
• Resolved: 24/May/14 14:04

Description

When compiling the codecs with Java 8 update 20 (coming soon), we fail: The constructors initialize a final closeable field inside a try block, which makes the field possibly undefined in the finally block.

Previous Java versions somehow did not detect this bug, but it is a real one. Final fields must be initialized before they are used. Earlier compilers did not detect this bug, but I think it is not buggy, because IOUtils can handle null.