Disconnected from the target VM, address: '127.0.0.1:5984', transport: 'socket'

乍一看以为: 你的端口已经被其他程序占用，无法连接目标虚拟机.  其实不是的.

netstat -ano

Connected to the target VM, address: '127.0.0.1:6151', transport: 'socket'
0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,
myThread: true
test--------------------
mainThread: true
mainThread: false
Disconnected from the target VM, address: '127.0.0.1:6151', transport: 'socket'

当Java调试器连接到JVM的调试端口时，它会显示以下消息:

Connected to the target VM, address: '127.0.0.1:6151', transport: 'socket'

同样，当程序终止时，将显示以下消息，指示调试器已与端口断开连接:

Disconnected from the target VM, address: '127.0.0.1:6151', transport: 'socket'