CompilerToVM::getLocalVariableTableStart and CompilerToVM::getLocalVariableTableStart return 0 on valid methods with local variables.
For example
    public int dummyInstanceFunction() {
        String str1 = "123123123";
        double x = 3.14;
        int y = Integer.parseInt(str1);

        return y / (int) x;
    }
javap
  public int dummyInstanceFunction();
    descriptor: ()I
    flags: ACC_PUBLIC
    Code:
      stack=3, locals=5, args_size=1
         0: ldc #4 // String 123123123
.......