What does it mean for a breakpoint to be installed?

Question

The documentation for Eclipse states that a blue circle icon represents an

enabled line breakpoint

and that a checkmark is an

Answer 1

I think it's a breakpoint that's been compiled and is available next time you run.

Answer 2

This thread (2002!) has a good explanation for installed breakpoints

Blue breakpoints mean that the breakpoint is not installed.
In older builds, a green icon means that the breakpoint was successfully installed.
An installed breakpoint means that the class has been loaded in the target VM and a breakpoint request has been successfully created at the desired location (for a line breakpoint) for the current debug target.

In the current builds, an installed breakpoint is indicated with a small checkmark overlay icon on top of the blue "base" icon.

A breakpoint may not been installed:

• when the class is not loaded (or not yet loaded)
• our breakpoint location verifier fails to identify a non-executable line of code and lets you place a breakpoint on that line.
• when you run instead of debug.

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As mentioned in jdt documentation:

• An enabled breakpoint causes a thread to suspend whenever the breakpoint is encountered. Enabled breakpoints are drawn with a blue circle and have a checkmark overlay once successfully installed. A breakpoint can only be installed when the class the breakpoint is located in has been loaded by the VM.
• A disabled breakpoint will not cause threads to suspend. Disabled breakpoints are drawn with a white circle .

Answer 3

Installed means that the program will indeed hit that break point when debugging.