JDK-6970833 : Try-with-resource implementation throws an NPE during Flow analysis
  • Type: Bug
  • Component: tools
  • Sub-Component: javac
  • Affected Version: 7
  • Priority: P2
  • Status: Closed
  • Resolution: Fixed
  • OS: generic
  • CPU: unknown
  • Submitted: 2010-07-21
  • Updated: 2011-03-07
  • Resolved: 2011-03-07
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JDK 7
7 b105Fixed
Related Reports
Relates :  
JDK-6911256 - Project Coin: Support Automatic Resource Management (ARM) blocks in the compiler
Description
The following program crashes javac:

class Test {
    public void test() {
        try(Resource r = null) { }
    }

    interface Resource extends AutoCloseable {}
}
Comments
SUGGESTED FIX A webrev of this fix is available at the following URL: http://hg.openjdk.java.net/jdk7/tl/langtools/rev/62f3f07002ea
29-07-2010
EVALUATION The problem is caused by the fact that the resource type is an interface; as such, the lookup strategy used to lookup the close() method fails; flow analysis should be updated in order to use a more robust lookup strategy (possibly the same used during method resolution).
21-07-2010