Guice：如何创建HttpSessionProvider

Question

I have a module below which is defined as a inner class of the Servlet.

private static abstract class TestModule extends AbstractModule 
implements Provider<HttpSession> {

    @Override 
    protected void configure( ) {
     bind(HttpSession.class).toProvider( TestModule.class );
    }
    @Override public abstract HttpSession get( );
}

Within the doGet() of the Servlet I created the Injector as below:

@Override 
protected void doGet( final HttpServletRequest req,
        HttpServletResponse resp ) throws ServletException, IOException {

    Injector injector = Guice.createInjector( new TestModule( ) {
        @Override 
        public HttpSession get( ) {
            return req.getSession( );
        } 
    });      
}

I get error:

1) No implementation for javax.servlet.http.HttpSession was bound.

What am I doing wrong?

Answer 1

The problem is that you configure like this:

bind(HttpSession.class).toProvider( TestModule.class );

but the actual provider of HttpSession is that Anonymous inner class you create when creating your injector.

To solve this, simply use the ServletModule of Guice: http://code.google.com/p/google-guice/wiki/ServletModule