The beginning of the forecast:
This notebook operating system is win10 Professional Workstation, debug start the project, provide the perfect project started successfully, then consumer items error: Unable to open debugger port (127.0.0.1:63959 ): java.net.SocketException "socket closed", compiled just can not open up the debugger port, the socket is closed. run directly start seems to have said port exceptions, may guess the problem is the operating system (Baidu has no fruit, no reason to guess), then I get another laptop, the operating system is win10 Home Edition, idea versions are 209.1.1, re above you need to configure it again, running just fine. Write a set of CRUD and multi-table joint investigation, familiar with the project structure, in the evening re-exchange for the original notebook, debug start or the original wrong, run to run the project without the error. Restart the project several times, debug and can run the project, and the specific reasons have not yet found, but delayed my time of day, continue to debug, Baidu search, and finally found the original operation is also not a problem, really the scrambled eggs.
The fastest way is to restart the software, if not restart the computer.
Now the solution:
change debug port, run change the port, JMX port change the port