Stateless beans - still hazy about caching

[Billy Vandory]

I have a ServletContextListener where I do a lookup and store it in an attribute, as per below:

   
// EJB 3
 public void contextInitialized(ServletContextEvent event) {
    	ServletContext sc = event.getServletContext();
    	CategoryBeanLocal local = null;
    	
    	try {
            InitialContext initial = new InitialContext();
            local = (CategoryBeanLocal) initial.lookup("java:comp/env/ejb/CategoryBean");
    	}
        catch (Exception e) {
            logger.error(e.getCause());
        }

        // "cache" the bean in the attribute for use within servlet(s)
        sc.setAttribute("CategoryBean", local);
        
    	logger.info("Initialized");
    }
 

As I kind of understand it, the container has a Stateless bean pool. Would doing the above and using getAttribute to retrieve the bean in a servlet, say, still use the pool, or would it refer to the same bean instance? Or are caching local stateless beans even required? (ps: i know that this way isn't the best practice, I'm just trying to figure out the behaviour of caching stateless beans.)


Thank you very much,

Billy

[Billy Vandory]

I did another test which has me a bit confused. When I call a method on a stateless bean where the method does not return for 10 seconds or so, all other methods on the bean are blocked. If I change the code to do a separate lookup for each method I want to invoke, the methods do not block, which leads me to believe that I should not cache the bean lookup ?

[Gaurav Ag Agarwal]

I saw what you did.. You can go from through this tutorial if you need it has all your basic details at http://www.roseindia.net/javabeans/javabeans.shtml

[Jaikiran Pai]

Gaurav Ag Agarwal wrote:I saw what you did.. You can go from through this tutorial if you need it has all your basic details at http://www.roseindia.net/javabeans/javabeans.shtml

Out of curiosity, how is that "course" related to this specific question? A quick look at that page shows that it provides an overview of EJB applications, but is no way related to the specific question which Billy asked in this thread.

[Jaikiran Pai]

Billy Vandory wrote:I did another test which has me a bit confused. When I call a method on a stateless bean where the method does not return for 10 seconds or so, all other methods on the bean are blocked.

Are you sure it's a stateless bean? And which application server is this?

[Billy Vandory]

Jaikiran Pai wrote:

Billy Vandory wrote:I did another test which has me a bit confused. When I call a method on a stateless bean where the method does not return for 10 seconds or so, all other methods on the bean are blocked.

Are you sure it's a stateless bean? And which application server is this?

Yep, it's annotated as @Stateless

App server is Geronimo with an OpenEJB plugin.

[Billy Vandory]

Jaikiran Pai wrote:

Gaurav Ag Agarwal wrote:I saw what you did.. --snip--

Last Summer?