RFR: 8048020 - Regression on java.util.logging.FileHandler

Jason Mehrens jason_mehrens at hotmail.com
Wed Jun 25 15:27:30 UTC 2014


> Catching OverlappingFileLockException is usually a sign of a mis-use. 
> Can you summarize how this comes about (given the locking on "locks"). 

Malicious intent or ignorant mis-use by code outside of the FileHandler can turn the FileHandler into a victim of that misuse.


public static void main(String[] args) throws Exception {
        Path p = Files.createTempFile("test", "test");
        try (FileChannel pathogen = FileChannel.open(p, CREATE, WRITE)) {
            FileLock lck = pathogen.lock();
            try (FileChannel fileHandler = FileChannel.open(p, WRITE, APPEND)) {
                FileLock fhl = fileHandler.lock();
        } finally {


sun.nio.ch.FileLockImpl[0:9223372036854775807 exclusive valid]
Exception in thread "main" java.nio.channels.OverlappingFileLockException



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