How to identify which lines of code participated in a specific execution of a Java program?

Question

Suppose that I have a Java program within an IDE (Eclipse in this case). Suppose now that I execute the program and at some point terminate it or it ends naturally.

Is there a convenient way to determine which lines executed at least once and which ones did not (e.g., exception handling or conditions that weren't reached?)

A manual way to collect this information would be to constantly step with the debugging and maintain a set of lines where we have passed at least once. However, is there some tool or profiler that already does that?

Edit: Just for clarification: I need to be able to access this information programmatically and not necessarily from a JUnit test.

Answer 1

eclemma would be a good start: a code coverage tool would allow a coverage session to record the information you are looking for.

_{(source: eclemma.org)}

Answer 2

What you're asking about is called "coverage". There are several tools that measure that, some of which integrate into Eclipse. I've used jcoverage and it works (I believe it has a free trial period, after which you'd have to buy it). I've not used it, but you might also try Coverlipse.

Answer 3

If I understand the question correctly you want more than the standard stacktrace data but you don't want to manually instrument your code with, say, log4j debug statements.

The only thing I can think of is to add some sort of bytecode tracing. Refer to Instrumenting Java bytecode. The article references Cobertura which I haven't used but sounds like what you need...