[Bug crypto/28678] Misleading error message from gnu.java.security.Engine

[csm at gnu dot org]

------- Comment #7 from csm at gnu dot org  2006-08-10 21:47 -------
We absolutely should say which class was not found if you use a `getInstance'
method with an explicit provider or provider name.

For the `getInstance' method that searches all providers, it would be nice to
provide a detailed error message that listed the providers tried, and the
outcome (e.g., "Provider1": algorithm "FOO" not supported; "Provider2": class
"com.xxx.Foo" not found for algorithm "FOO"). That wouldn't be easy in the
current implementation, unfortunately, since it would require changing classes
that use Engine, of which there are a lot.

A generic way to do that would be, for example:

  String msg = algorithm + ": ";
  for each provider
    try
      return getInstance(algorithm, provider);
    catch NoSuchAlgorithmException nsae
      msg += provider.getName() + ": " + nsae.getMessage();
  throw new NoSuchAlgorithmException(msg);

...and in Engine, we give a detailed reason why the lookup failed.


-- 

csm at gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|2006-08-10 18:20:20         |2006-08-10 21:47:37
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28678