https://openjdk.java.net/ 
interface sun.security.jgss.krb5.Krb5CredElement extends sun.security.jgss.spi.GSSCredentialSpi
  minor version: 0
  major version: 59
  flags: flags: (0x0600) ACC_INTERFACE, ACC_ABSTRACT
  this_class: sun.security.jgss.krb5.Krb5CredElement
  super_class: java.lang.Object
{
}
SourceFile: "Krb5CredElement.java"