Inner classes not resolved in method parameters

I have a very simple class containing an inner class :

package com.bsb.package1;

public class Class2 {

public static final class InnerClass {
}
}

In another class I use the inner class as a method parameter :

package com.bsb;

import com.bsb.package1.Class2;

public class Class1 {
public void testMethod(Class2.InnerClass param) {
}
}

• After a build of the source tree, the result of method.getDeclarationSignature(true) is :

public void testMethod(Class2.InnerClass param)

• The problem is that that the name of the class of the parameter is NOT fully qualified.

• BUT if I add the (useless) explicit import of the inner class (i.e. import com.bsb.package1.Class2.InnerClass then the result is :

public void testMethod(com.bsb.package1.Class2.InnerClass param)

... which is correct.