public ProtectionDomain(CodeSource codesource, PermissionCollection permissions, ClassLoader classloader, Principal[] principals)
public ProtectionDomain(CodeSource codesource, PermissionCollection permissions)
  public ProtectionDomain(CodeSource codesource,                          PermissionCollection permissions,                          ClassLoader classloader, Principal[] principals)  {    this(codesource, permissions, classloader, principals, false);  }