gistfile1.txt

    public void checkSession() throws ExceptionWorldConflict { // CraftBukkit - throws ExceptionWorldConflict
        try {
            File file1 = new File(this.baseDir, "session.lock");
            DataInputStream datainputstream = new DataInputStream(new FileInputStream(file1));

            try {
                if (datainputstream.readLong() != this.sessionId) {
                    throw new ExceptionWorldConflict("The save is being accessed from another location, aborting");
                }
            } finally {
                datainputstream.close();
            }
        } catch (IOException ioexception) {
            throw new ExceptionWorldConflict("Failed to check session lock, aborting");
        }
    }