How to detect deadlock ? Timeout in synchronized block?

Question

I’m debugging a Java application that runs several threads. After a while of watching the log it seems that one of those threads is not running anymore. My guess is that the

Answer 1

You can use a java.util.concurrent.Lock instead of the intrinsic Object locks. RentrantLock without fair ordering has the same basic behaviour and semantics as an intrinsic lock. There is a method tryLock that takes a timeout parameter:

Lock lock = ...;
if (lock.tryLock(10L, TimeUnit.SECONDS)) {
    try {
        // manipulate protected state
    } finally {
        lock.unlock();
    }
} else {
      // perform alternative actions
}