Unfortunatelly I think it's not possible right now.

Admin client uses Admin REST API, which isn't handling errors correctly.

If you try to reset a password using Admin interface you will get a generic error 500 saying "Failed to reset user password".

In the server the stacktrace shows:
Caused by: org.jboss.resteasy.spi.UnhandledException: org.keycloak.models.ModelException: invalidPasswordMinLengthMessage

We could fill a JIRA to handle ModelException using JAX-RS exception handlers, so the response will have the correct error and we could show a better error message.

On Wed, May 6, 2015 at 2:10 PM Benjamin Hansmann [alphaApps] <b.hansmann@alphaapps.de> wrote:

Is one able to get an error message from the resetPassword method of
admin-client if it somehow failed to reset the password, like when the
password is too short or does not comply with the password policy?

It throws an InternalServerErrorException in that case. On the server
side there seems to be a ModelException:
invalidPasswordMinLengthMessage. That information is lost...

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