@AccessTimeout（value=0）和@Lock（LockType.WRITE）之间的java差异

Question

正如我在《用Java 7 EE乞讨》中读到的：

@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.

所以。。。有什么区别？这两个注释都禁用并发调用，我看不出它们之间有什么区别。在什么情况下将它们一起使用是有意义的

Answer 1

第一个方法将阻止后续调用方，直到当前调用方完成其调用。第二个@AccessTimeoutvalue将在同时有多个调用时引发异常。差别很大