The following problem was originally reported in 4634068.

There are a number of classes that do not respect the
implied contract for equals and hashCode. See, for example,
Joshua Bloch's book "Effective Java", items 7-8.

sun.security.krb5.Realm defines
  equals(sun.security.krb5.Realm) but doesn't redefine
  equals(Object)
sun.security.krb5.internal.HostAddresses defines
  equals(sun.security.krb5.internal.HostAddresses) but doesn't redefine
  equals(Object)
sun.security.krb5.internal.KerberosTime defines
  equals(sun.security.krb5.internal.KerberosTime) but doesn't redefine
  equals(Object)
sun.security.krb5.internal.rcache.a9 redefines
  equals(Object) but not hashCode()
sun.security.x509.AVAComparator redefines
  equals(Object) but not hashCode()
sun.security.x509.EDIPartyName redefines
  equals(Object) but not hashCode()
sun.security.x509.GeneralName redefines
  equals(Object) but not hashCode()
sun.security.x509.GeneralSubtree redefines
  equals(Object) but not hashCode()
sun.security.x509.OtherName redefines
  equals(Object) but not
  hashCode()
sun.security.x509.PolicyInformation redefines
  equals(Object) but not
  hashCode()
sun.security.jgss.ProviderList$PreferencesEntry redefines
  equals(Object) but not
  hashCode()

Problems found by applying automatic tools to JDK
libraries. However, manual inspectation of the classes
reveals the same problems.

-- iag@sfbay 2002-02-06

Additional classes reported by a tool that applies similar checks:

sun.security.jgss.spi.GSSNameSpi-
equals signature is: (Lsun/security/jgss/spi/GSSNameSpi;)Z To override it has to be: (Ljava/lang/Object;)Z

sun.security.acl.AllPermissionsImpl -
equals signature is: (Ljava/security/acl/Permission;)Z To override it has to be: (Ljava/lang/Object;)Z

sun.security.acl.GroupImpl -
equals signature is: (Ljava/security/acl/Group;)Z To override it has to be: (Ljava/lang/Object;)Z

The classes listed above for not overriding hashCode method use hashCode method
from the class Object. Hence overriding hashCode is most likely required.

###@###.### 2002-10-30