Eclipse Breakpoint Is Not Hit

Today I was debugging a Java web application, and I met a strange problem:

In the javascript side, it is written in this way:

 var helpers = { 
 executeQuery: function(a) {               
  var param = {sQuery : a.sqlquery, sTitle: ""};
  REST.postObject('resources/whiteboardsql/executeQuery/'+a.instanceId+"/"+a.timestamp,param, a);
 }

And in the java side, I am sure that the code below it the rest call will invoke, so that I set a breakpoint there. But what's weird is that I executed the rest call many times but the breakpoint is never hit.

Finally I figured out the reason, it is so simply but I would like to share with those who might experience the same scenario.
The reason is "Hot Code Replace Failed"

I was modified the program, and the modification was deleting a comment, but eclipse pops up the "Hot Code Replace Failed" dialog. And I clicked "Continue".

Then when I come to debug the problem, the breakpoint is not hit. Terminate and restart the application solves the problem.

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