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I have an HTML5 project with Angular.js . I've configured the project to run with an "External" web server and have specified the project URL and the start file. Clicking on the "Run" icon for the project starts Chrome and I can interact with the application; however, I'm unable to set debug breakpoints in the IDE - clicking on the editor sidebar quickly adds a red square for a breakpoint and that breakpoint is immediately cleared. Nothing shows up in the list of breakpoints. On a similar note, the Debugging -> Sources window doesn't have any entries and does not allow adding my own source roots (like it does for normal Java debugging)
Sometimes it helps to restart IDE or to create breakpoint using Debug->New Breakpoint (file path need to be absolute). *** This bug has been marked as a duplicate of bug 239549 ***