I am continuing my path to deep understanding of Java Thread. Unfortunately my Java Certification didn't cover that part, so the only way of learning is to post a series of dumb questions. With so many years of Java Development, I am sometimes wondering how much I still have to learn :-)
In particular my attention is now with the reference handler thread.
"Reference Handler" daemon prio=10 tid=0x02da3400 nid=0xb98 in Object.wait() [0x0302f000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x1aac0320> (a java.lang.ref.Reference$Lock)
at java.lang.Object.wait(Object.java:485)
at java.lang.ref.Reference$ReferenceHandler.run(Unknown Source)
- locked <0x1aac0320> (a java.lang.ref.Reference$Lock)
Now some questions are following, for some of them I know the answer, but I am not posting it, because I would like to hear someone else opinions:
as usual, I kindly ask to answer all the questions, so that I can mark answered.
java.lang.ref.Reference$Lock
was locked in the method mentioned in the line preceding it (i.e in ReferenceHandler.run()
..class
file doesn't contain any source code location information (at least for this specific point). This can happen either when the method is a synthetic one (doesn't look like it here), or the class was compiled without debug information.waiting on
without a corresponding locked
.