ERROR 2015-07-23 13:55:13.924 26125 --- [ shutdown hooks] cascading.util.ShutdownUtil : failed executing hook: null, with exception: {}
java.lang.NullPointerException: null
at cascading.util.ShutdownUtil$2.run(ShutdownUtil.java:106)
Note that this implementation is not synchronized. Multiple threads should not access a PriorityQueue
instance concurrently if any of the threads modifies the queue. Instead, use the thread-safe PriorityBlockingQueue
class.
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