Hotswap/DCEVM doesn't work in Intellij IDEA (Community Version)

I have troubles in making use of the hotswap function in Intellij IDEA Community Version. Mine's v 14.1.4.
Each time after I fired off debugging and change the java code, I have already click rebuild project and press "Yes" on confirming reload classes. Intellij reports that changed classes are reloaded, but the application outcome is the same as before. I'm just trying the simplest Java application (i.e. not in scenarios like Tomcat, applet etc) with stuffs simply like System.out.println, string concats etc. What I've changed during debug mode is just method body codes, but not the method signature/name. I can't get it.
In Eclipse I just directly change the code and press save, then it just works.
What went wrong?
(Remarks:
In fact I'm attempting to use DCEVM which makes structure change possible (e.g. change class name, method name, add methods etc), thought that it would solve the problem of the hotswap problem found in Intellij. Needless to say, it didn't work.
In eclipse, I succeed in using DCEVM and can change the method names during debugging.
I further try hotswap-agent and it still didn't work; I've come across an article saying that the IDE must JDPA-connect to the JVM thru port 5000, but no matter how I tried, Intellij console shows that it is still connecting thru a random port (51018 below):
"C:\Program Files\Java\jdk1.8.0_60\bin\java" -agentlib:jdwp=transport=dt_socket,address=127.0.0.1:51018...." Connected to the target VM, address: '127.0.0.1:51018', transport: 'socket'
Is it possible to force it to connect thru one specific port? Adding the DEBUG_OPT environment variable in the Run/Debug Config doesn't work)

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