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javajakarta-eetimeoutejbconcurrentmodification

Differences between @AccessTimeout(value = 0) and @Lock(LockType.WRITE)

As I read in Beggining With Java 7 EE:

@Lock(LockType.WRITE): A method associated with an exclusive lock will not allow concurrent invocations until the method’s processing is completed.

An @AccessTimeoutvalue of 0 indicates that concurrent access is not allowed. This will result in throwing a ConcurrentAccessExceptionif a client invokes a method that is currently being used.

So... what's the difference? Both annotation disables concurrent invocations and I don't see any difference beetwen them. Is there any situation when it makes sense to use them together?

Solution

  • The first method will block subsequent callers until the current one finish its call. The second, @AccessTimeoutvalue will throw an exception if there are more than one calls at the same time. Quite a difference.