idea使用gradle的gretty的debug

首先说明必须启动两个进程，使用java的remote模式

Prepare "Remote Debug" configuration

1. Select menu "Run/Edit Configurations".
   
   Check: "Run/Debug Configurations" dialog pops up.
2. Click on "+" icon, select "Remote" from the list.
   
   Check: new configuration with name "Unnamed" appears under "Remote" category.
3. Change configuration name to something more sensible, like "Remote Debug".
4. Don't change any other parameters, just click "OK".

Run web-application under the debugger

1. Start gradle task "appStartDebug" under IntelliJ IDEA.
   
   Attention: do not try to start this task under the debugger. Run it in normal mode.
   
   Check: you should see "Listening for transport dt_socket at address: 5005" in "Run" output window.
2. Select menu "Run/Run...", select "Remote Debug" configuration, select "Debug" command.
   
   Check: you should see "Connected to the target VM, address: 'localhost:5005', transport: 'socket'" in "Debug" output window.
   
   Check: you should see "Run 'gradle appStop' to stop the server." in "Run" output window.

Important: you should stop debugged web-application via gradle task "appStop". Otherwise there will be process hanging.
因为这是一个孤立的进程，必须手工结束。