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Nullness Checker: method framing mistake #425

Open GoogleCodeExporter opened 9 years ago

GoogleCodeExporter commented 9 years ago 
The attached file checks without warning with the Nullness Checker, yet 
produces an NPE at runtime:

$ ./bin-devel/javac -processor 
org.checkerframework.checker.nullness.NullnessChecker Issue425.java 

$ java Issue425
Exception in thread "main" java.lang.NullPointerException
    at Issue425.fail(Issue425.java:22)
    at Issue425.main(Issue425.java:27)

Tested with both 1.8.11 and trunk as of today (2015-04-04).

The cause might be that these two features are not handled in the correct order:
- after a method call, the receiver can be assumed to be non-null.
- after a non-pure method call, fields might have changed.

Dealing with this soundly might result in many more errors and we need to think 
of a good way to add better framing.

Original issue reported on code.google.com by wdi...@gmail.com on 4 Apr 2015 at 2:52

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