[jbossseam-issues] [JBoss JIRA] Closed: (JBSEAM-2164) Improve exception chaining in SeamLoginModule

[Shane Bryzak (JIRA)]

     [ http://jira.jboss.com/jira/browse/JBSEAM-2164?page=all ]

Shane Bryzak closed JBSEAM-2164.
--------------------------------

    Fix Version/s: 2.0.1.GA
       Resolution: Done

> Improve exception chaining in SeamLoginModule
> ---------------------------------------------
>
>                 Key: JBSEAM-2164
>                 URL: http://jira.jboss.com/jira/browse/JBSEAM-2164
>             Project: JBoss Seam
>          Issue Type: Feature Request
>          Components: Security
>    Affects Versions: 2.0.0.CR3
>            Reporter: Yannick Lazzari
>         Assigned To: Shane Bryzak
>            Priority: Minor
>             Fix For: 2.0.1.GA
>
>
> This an improvement request in the SeamLoginModule class to properly chain exceptions when throwing LoginExceptions in the login method. See code below:
> public boolean login() 
>       throws LoginException
>    {
>       try
>       {
>          NameCallback cbName = new NameCallback("Enter username");
>          PasswordCallback cbPassword = new PasswordCallback("Enter password", false);
>    
>          // Get the username and password from the callback handler
>          callbackHandler.handle(new Callback[] { cbName, cbPassword });
>          username = cbName.getName();
>       }
>       catch (Exception ex)
>       {
>          log.error("Error logging in", ex);
>          throw new LoginException(ex.getMessage());
>       }
>       
>       MethodExpression mb = Identity.instance().getAuthenticateMethod();
>       if (mb==null)
>       {
>          throw new IllegalStateException("No authentication method defined - please define <security:authenticate-method/> for <security:identity/> in components.xml");
>       }
>       
>       try
>       {
>         return (Boolean) mb.invoke();      
>       }
>       catch (Exception ex)
>       {
>          log.error("Error invoking login method", ex);
>          throw new LoginException(ex.getMessage());
>       }
>    }
> 	
> In both instances where a LoginException is thrown, only the message is passed to the constructor of the LoginException. I know that the LoginException does not overload the constructor to pass a cause directly but we can use the initCause method instead:
> LoginException loginException = new LoginException();
> loginException.initCause(originalException);
> throw loginException;
> 	
> If people use typed exceptions in their authenticator method to express different reasons why the login attempt failed, it's impossible right now to get that original exception.

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