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Are you putting the breakpoint at empty line, variable declaration, or just comment then that will result in green and invalid breakpoints.<br />
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You may check this <a href="http://www.tek-tips.com/viewthread.cfm?qid=1421720&page=9" rel="ugc">thread</a> for more info.
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Or simply there's not code to debug, maybe due to missed calls by the client, or due to not running client.<br />
Speaking of a DataSnap server it could be the situation. 
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when you compile, a blue dot appears next to all &quot;breakpoint-able&quot; lines.<br />
Do you confirm that the line where you want to put a break point has that blue dot ?<br />
If that is the case, what happens if you hit F8 to start the application (step by step run) instead of F9 ? is your debug mode working or not at all ?
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I am sure there has code to debug, I even set the bleak point in Project Source, code like &nbsp;Application.CreateFrom(...<wbr />.). &nbsp;It also show in Green after I click F9. &nbsp;If I click F8, &nbsp;it will then go to CPU view, &nbsp;I keep on press F8, it just loop through the code in CPU view. &nbsp;then the application is run. &nbsp;It never break in the code I write. &nbsp;It seems this problem is just happened in the project. &nbsp;If I try to create a new project, the debugger works. &nbsp;
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Again, take care that the code you want to debug is really executed. If it's a portion of code that must respond to a client call or something else but there're not calls, it could never be executed, so also not debugged.<br />

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First you have to select all the debug info and remove the compiler optimization. Then Build your project with the debug info and finally run run it then your breakpoints will be enabled
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epasquier:<br />
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No blue dot in any line of my code
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Finally, My problem is because the pas is not in the uses list of the project source file. &nbsp;but it still can run without any problem. &nbsp;I added it back to the source file and break point works now.
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I am developing a Datasnap 2009 Server side, &nbsp;When I try to set a break point, it will change to Green color when run the application. &nbsp;seems the project have something special that I can't debugger. &nbsp;Any Idea to solve this problem? &nbsp;The debugger work before, it also work if I create a new project.
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I am developing a Datasnap 2009 Server side,  When I try to set a break point, it will change to Green color when run the application.  seems the project have something special that I can't debugger.  Any Idea to solve this problem?  The debugger work before, it also work if I create a new project.

Debugger not work when I set a break point in Delphi 2009

Development in most programming languages is frequently done with an editor or integrated development environment (IDE). An IDE is a software application that provide comprehensive facilities to computer programmers for software development. An IDE normally consists of a source code editor, build automation tools and a debugger. XCode, Visual Studio, Adobe Dreamweaver and Eclipse are some of the more popular development tools, but an editor or IDE can be anything from simple text editors to sophisticated programs. Related topics: All programming and development language, database and web based content management systems topics