java - Java Sonar/FindBugs - マルチスレッドの正確性

Question

ソナーは次の問題を報告します:

Multithreaded correctness - Method does not release lock on all
exception paths findbugs : UL_UNRELEASED_LOCK_EXCEPTION_PATH
This method acquires a JSR-166 (java.util.concurrent) lock, but does not release it on all exception paths out of the method. In general, the correct idiom for using a JSR-166 lock is:  



Lock l = ...;
l.lock();
try {
    // do something
} finally {
    l.unlock();
}

このコード スニペットについて:

   public synchronized void put(T element) throws PreconditionException {
        Precondition.notNull(element, "Nullobject is not allowed");
        lock.lock();
        try {
            buffer[writeIndex++] = element;
            if (writeIndex >= capacity) {
                writeIndex = 0;
            }
            if (size.get() >= capacity) {
                // buffer is full
                readIndex++;
                lastOverflow.set(System.currentTimeMillis());
                if (readIndex >= capacity) {
                    readIndex = 0;
                }
                return;
            }
            size.incrementAndGet();
        } finally {
            try {
                notEmpty.signal();
            } catch (Exception e) {
               e.printStackTrace();
            }
            lock.unlock();
        }
    }

届かないのですが、これは安全ではありませんか?