The JUnit method counter counts the compareTo method twice. What for?

I am working on a Java Springframework project and using JUnit4 to test it.

My class implements Comparable and overrides the compareTo method.

In my test, when I do

@Test
Class<myClass> m = myClass.class;
Method[] methods = m.getDeclaredMethods();
assertEquals(5, methods.length); 

This test fails , although there are exactly 5 methods in myClass . When I looked in the Eclipse debugger, I see that the compareTo method is called twice.

I can not find an explanation for this behavior. Why is this happening?