Currently not possible or straightforward to achieve. In CAS v5 (available in 
SNAPSHOTs versions already) custom error messages based on the custom 
authentication exceptions would be a trivial feature available out of the box:

On Fri, May 6, 2016 at 17:47, Nicolás <[email protected]> wrote:
Hello all,
I need to show a dynamic/custom error message when login fail, currently we are 
showing the default one: authenticationFailure.AccountNotFoundException=
My dynamic login message comes from my own custom 
UserPasswordAuthenticationHandler


Example:
@Override protected HandlerResult 
authenticateUsernamePasswordInternal(UsernamePasswordCredential 
transformedCredential) throwsGeneralSecurityException, PreventedException { try 
{ ……………..
} else {
throw newAccountNotFoundException(
document.getElementsByTagName("mensaje_usuario").item(0).getFirstChild().getNodeValue());
 } ……………..
I'm newbie on with CAS, anybody has an example to do that?
Can anybody help me, please?
Best regards

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Best, D.

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