Java程式問題定位時執行緒棧資訊是一個重要線索，如下圖：

“Thread-1” prio=6 tid=0x05b84800 nid=0x660 waiting for monitor entry [0x063bf000]
	java.lang.Thread.State:Blocked (on object monitor)
		at com.road.threadDead.ThreadDead.run(ThreadDead.java:40)
		-waiting to lock<0x29617b0>(a java.lang.Object)
		-locked<0x29e617b8>(a java.lang.Object)
		at java.lang.Thread.run(Thread.java:724)
	
	Locked ownable synchronizers
		-None

“Thread-0” prio=6 tid=0x05b84000 nid=0xfb8 waiting for monitor entry[0x0613f000] 
	java lang.Thread.State:BLOCKED(on object monitor)
		at com.road.threadDead.ThreadDead.run(ThreadDead.java:29)
		-waiting to lock <0x29e617b8>(a java.lang.Object)
		-locked <0x29e617b0>( a java.lang.Object)
		at java.lang.Thread.run(Thread.java:724)

	Locked ownable synchronize
		-None
 

Thread-1：是執行緒名稱。

tid：Java的執行緒ID。

nid：每一個Java執行緒在作業系統層面都與一個執行緒對應，這個執行緒ID就是nid。

prio：執行緒優先順序。

waiting for monitor entry[0x063bf000]：等待獲取物件鎖，而這個物件正好由thread-0所持有，所以這兩個執行緒實際上是互鎖，也就是死鎖。

[0x063bf000]：執行緒棧起始地址。