Fix coverage calculation for JVM projects #1607
Merged
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It is found that the code coverage report calculation for JVM does not reflect the real data correctly. After some analysis of the code, it is believed that the current coverage calculation and extraction from the jacoco.xml only consider items in terms of source files but not methods. This cause separate methods inherit a wrong coverage calculation. This PR proposes a revamp on the coverage calculation for JVM projects to consider cov_map on separate methods instead of the whole source files. This is necessary to retrieve correct coverage information for each methods and that information is needed for further post-processing and the candidate choosing process for oss-fuzz-gen.