how to use jacoco.exec report
Solution 1:
In IntelliJ Idea from the menu select Analyze
> Show Coverage data
. In the new window press the + button and select your .exec file.
The test coverage results will appear in the editor Coverage tab.
Update:
In the latest version of Intellij Idea the menu has been moved to Run
> Show Code Coverage Data
Solution 2:
For Eclipse users, you can simply use EclEmma jacoco plugin in Eclipse. Window > Show View > Coverage (of course you must install the plugin first). In the Coverage window, Right click > Import >..... Select the exec file (or other nice methods), select your source code, then see. You can also export the result to html file.