How do I write a flexible code that can test any input code for runtime errors [closed]

I have to write a code that will accept any input JAVA code and will detect it's runtime errors and show exactly where the bugs contain. I need to test only a few features like functions, classes, loops, control statements, etc. Everywhere I'm trying to search, it shows me Junit testing for specific code only. But I want to create a universal code that can test any other code