David Hovemeyer writes:

H HE: java.util.Collections$CheckedMap$CheckedEntrySet defines equals and uses Object.hashCode()

No hashCode method is defined for java.util.Collections$CheckedMap$CheckedEntrySet, will default to using
Object.hashCode().

This is a serious bug and needs to be fixed.

Code showing problem:

import java.util.*;

class F {
  public static void main(String args[]) throws Exception {
        Map<String,String> m = new HashMap<String,String>();
        m.put("a","b");
        Set<Map.Entry<String,String>> s = m.entrySet();

        Map<String,String> m2 = Collections.checkedMap(m,
                                                String.class, String.class);
        Set<Map.Entry<String,String>> s2 = m2.entrySet();
        System.out.println(m.hashCode());
        System.out.println(s.hashCode());
        System.out.println(m2.hashCode());
        System.out.println(s2.hashCode());
        }
}

Results (all should be the same):

[cafe 5] java F
3
3
3
25675463