gistfile3.txt

tlockney@mammoth ~/tmp/override $ javac *.java
Sub.java:2: method does not override or implement a method from a supertype
  @Override
  ^
1 error

Sub.java

class Sub extends Super {
  @Override
  public void foo(java.util.Map<Object,Object> bar) {}
}

Super.java

class Super {
  public void foo(java.util.Map bar) {}
}