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Like Mike Braun answer suggest, this is not possible according to JavaEE specifications. And that is unfortunate. But, what is a little less unfortunate is that there is some code to do that kind of things (application-server specific), hidden in that application server implementation of <code>@RunAs</code>. In Glassfish, that particular code is in the <a href="http://www.jarvana.com/jarvana/view/org/glassfish/security/security/3.1.1/security-3.1.1-sources.jar!/com/sun/enterprise/security/auth/login/LoginContextDriver.java?format=ok" rel="nofollow"><code>com.sun.enterprise.security.auth.login.LoginContextDriver</code></a> class, and particularly in its <code>LoginContextDriver#loginPrincipal</code> method. So, to have one part of code using a specific principal, I defined an interface <pre><code>public interface Sudoer { public <Result> Result sudo(String user, SudoOperation<Result> operation); } </code></pre> which I implemented for Glassfish as so : <pre><code>public class GlassfishSudoer implements Sudoer { @Override public <Result> Result sudo(String user, SudoOperation<Result> operation) { try { LoginContextDriver.loginPrincipal(user, "autocat"); return operation.perform(); } catch (Exception e) { throw new UnableToSudoException(e); } finally { LoginContextDriver.logout(); } } } </code></pre> And when using it, the part which wants to have some code "sudoed" only has to provide an implementation of the SudoOperation, like <pre><code> component.sudo(userLogin, new SudoOperation<Void>() { public Void perform() { /* do some sudoed code */ return null; } }); </code></pre> Advantage of this method is that, provided the given application server has some code to handle <code>@RunAs</code>, you can use that code to implement your own sudoer (I'm thinking about extracting that into a sudo-ejb library ...).
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