Hello,

I would like to have to share a data structure though JNDI. This data structure behaves like a synchonized cache (let's say a data structure based on an instance of HashMap). Some session beans of mine will then use this shared cache to store/access some stuff.

How should I do implement this shared cache ? I would like to understand what is the best practice to share a data structure between all instances a a session bean ?

I understand <env-entry> tags only allos you to share some basic types.

Therefore, I tried to bind such a cache in the init() method of a servlet (loaded at startup) :

InitialContext context = new InitialContext();
// Create application sub context
try {
 Context appContext = context.createSubcontext("java:comp/env/myApp");
} catch (NameAlreadyBoundException e) {
 // Do nothing
}
try {
 Context cacheContext = context.createSubcontext("java:comp/env/myApp/cache");
} catch (NameAlreadyBoundException e) {
 // Do nothing
}
context.rebind("java:comp/env/myApp/cache/aCache", new Cache());

In my session bean code, I attempt to get access to my cache with :

try {
 InitialContext context = new InitialContext();
 return (Cache) context.lookup("java:comp/env/myApp/cache/aCache");
} catch (NamingException e) {
 ... /...
}

However, when a session bean attempts to access to the shared cache, I get a NameNotFoundException saying 'myApp not bound' (note that the cache looked like well bound at startup of the initialization servlet).

Any ideas how I should proceed ?

Fred