How to handle RuntimeException in @PostConstruct when the FacesContext is not available?

Question

In my application I receive username/password via a servlet which calls a SessionScoped ServiceBean which initializes a SSH connection in a @PostConstruct method. If the SSH host is not available I want to redirect the user to "/applicationerror.html". Therefore I throw a RuntimeException in this method.

Neither a JSF ExceptionHandler catches my exception nor can I redirect the user via FacesContext.getInstance().getExternalContext().redirect() as the FacesContext is null in my PostConstruct method.

What can I do to avoid the http 500?

public class LoginServlet extends HttpServlet {

   @Inject
   private AnyBean anyBean;

   doPost() {
      anyBean.loginUser(requestparamusercode, requestparampassword)
   }
}

@Named
@SessionScoped
public class AnyBean implements Serializable  {

   @Inject
   private SshService sshService;

   public boolean loginUser(String usercode, String password) {
      sshService.login(usercode, password);
   }

@SessionScoped
public class CommandServiceImpl  {

   public boolean login(usercode, password)  {
      ....
   }

   @PostConstruct
   private void initSshConnection() {
      try {
      } catch(IOException e) {
     // what to do here
   }
}
}

Have you tried : http://stackoverflow.com/questions/12168043/jsf-redirect-in-postconstruct ? — Simon Arsenault, Jun 17 '13 at 15:00
I absolutely have no JSF context because my HTTP request is directly comming from a servlet (FacesContext.getCurrentInstance() == null). — Ginkgochris, Jun 17 '13 at 15:09
Is rendering a javascript redirection an acceptable solution? — Danubian Sailor, Jun 18 '13 at 07:17
I added the code sample. JavaScript doesn't seem to be a solution. — Ginkgochris, Jun 18 '13 at 08:00

score 0 · Answer 1 · answered Jun 17 '13 at 23:13

0

Sounds like you're going to have to catch the exception and use a RequestDispatcher in the catch block.

answered Jun 17 '13 at 23:13

LightGuard

5,298
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19

WITHIN the @PostConstruct method I can catch the exception. But what then? Where from do I get a ServletContext to create a RequestDispatcher? – Ginkgochris Jun 18 '13 at 07:41
1

You probably need to do the exception handling for the redirect in the servlet. – LightGuard Jun 18 '13 at 16:05

How to handle RuntimeException in @PostConstruct when the FacesContext is not available?

1 Answers1