In the source editor, add breakpoints to your code so you can pause at known points while debugging and inspect the values of variables.
Add a breakpoint: Click the gutter next to the line where you want execution to pause.
Move a breakpoint: Click a breakpoint and drag it to a new location in the gutter.
Disable or enable a breakpoint: Click the breakpoint icon in the gutter. A disabled breakpoint appears lighter in color and remains in your project, but is ignored during debugging.
Deactivate all breakpoints: Choose Debug > Deactivate Breakpoints. Breakpoints appear gray in color when deactivated, and are ignored during debugging.
Activate all breakpoints: Choose Debug > Activate Breakpoints.
Remove a breakpoint: Click the breakpoint and drag it out of the gutter.
Tip: You can use the Breakpoint navigator to manage all of the breakpoints in your project.