CODEWITHSUNDEEP
javaloggingservletsseam
Shadowman
Shadowman

Reputation: 12039

Seam Logger inside a Servlet?

Is there a way to use a Seam Logger inside of a standard Java Servlet? I have one servlet that I use to serve up content, while the rest of my application is developed using Seam. I'd like to be able to make use of Seam's built-in Log functionality in my servlet, the same way I do with the rest of my Seam-based classes. In my Servlet constructor, I tried calling

Log logger = (Log)Component.getInstance(Log.class);

...but I'm getting an exception. Is there a better way to "inject" a Logger into the servlet? Something I'm missing? Thanks!!

Upvotes: 4

Views: 1757

Answers (2)

stacker
stacker

Reputation: 68942

To use a Seam context you can wrap the doPost or doGet methods with ContextualHttpServletRequest which allows you to do Component lookups.

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        final HttpServletRequest req = request;
        new ContextualHttpServletRequest( req ) {
            public void process() throws Exception {
                wrappedPost( req );
            }
        }.run();
    }

// you renamed original doPost method
private void wrappedPost(HttpServletRequest request) {
...
}

The above example code allows you to access components by name, which are declared using the name annotation:

@Name("MyCcomponent")

The Logger is usually injected by the @Logger annotation, I checked logs the source package, there is no component with a @Name annotation that could be looked up. If you call a component (with @Logger) from the wrapped context, a logger will be injected (into the called compontent).

Seam uses in its components:

private static final LogProvider log = Logging
            .getLogProvider(MailSession.class);

Upvotes: 3

Maxime ARNSTAMM
Maxime ARNSTAMM

Reputation: 5314

I didn't tested it, but you could try this :

Log mylog = Logging.getLogger(MyClass.class);

That's what i use in my tests.

Upvotes: 3

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