* About JPDA (http://docs.oracle.com/javase/7/docs/technotes/guides/jpda/architecture.html)
JPDA: (Java Platform Debugger Architecture), the following diagram illustrates the architecture,
* How to setup Tomcat for remote debugging
It's quite simple to set up Tomcat for remote debugging. Open "bin/startup.bat", and you would find the following line at the end,
call "%EXECUTABLE%" start %CMD_LINE_ARGS%
Just add "jpda" in frond of "start", that's
call "%EXECUTABLE%" jpda start %CMD_LINE_ARGS%
This will use the default "JPDA_TRANSPORT" and "JPDA_ADRESS" settings in "bin/catalina.bat",
** set JPDA_TRANSPORT = dt_socket
** set JPDA_ADDRESS=8000
After that, if you start tomcat, you would see the following line from the command console,
Listening for transport dt_socket at address: 8000
Then you can set up your IDE (eclipse) to attach to the tomcat,
除了遠端debug之外，還有一種在開發階段很方便的方式就是在eclipse裡面直接指定tomcat的執行目錄，然後在eclipse裡面啟動tomcat，這樣就可以直接進行debug了。
第一步： 設定eclipse
window -> preference -> Tomcat, 然後入下圖所示設定tomcat的目錄 -
第二步：進行除錯
如下圖所示，可以在工具欄上直接雙擊tomcat的圖示進行啟動，然後就可以debug了。
