These are very different languages. For C++ there are not too many open source b/c C++ is tough. There is cppcheck, but if you want to do something very custom,

These are very different languages. For C++ there are not too many open source b/c C++ is tough. There is cppcheck, but if you want to do something very custom, starting with clang may be an option. For java FindBugs/SpotBugs/HuntBugs was the most prominent some years ago. Also check: https://github.com/mre/awesome-static-analysis https://github.com/mre/awesome-static-analysis