在Play Framework而非Tomcat中使用初始上下文

Question

So I have a basic DAO class that makes a connection using an InitialContext lookup with Tomcat and Spring and it works perfectly:

Context initCtx = new InitialContext();                        
initialize((DataSource) initCtx.lookup(resourceName));         

Now, I have extended that basic DAO and am using the child class in a play framework application. The initial context lookup, however, does not work on the play application. The error says:

Caused by: javax.naming.NotContextException: comp is not a subcontext
    at tyrex.naming.EnvContext.internalLookup(Unknown Source) ~[tyrex-1.0.1.jar:1.0.1  November 11 2003 1703]
    at tyrex.naming.EnvContext.lookup(Unknown Source) ~[tyrex-1.0.1.jar:1.0.1  November 11 2003 1703]
    at tyrex.naming.java.JavaContext.lookup(Unknown Source) ~[tyrex-1.0.1.jar:1.0.1  November 11 2003 1703]
    at javax.naming.InitialContext.lookup(InitialContext.java:417) ~[na:1.8.0]
    at DatabaseFactory.<init>(DatabaseFactory.java:63) ~[Utilities-SNAPSHOT.jar:na]

Is there anyway to use the initial context lookup function while still using the play framework?

Answer 1

Play's JNDI environment is provided by an in-memory JNDI service provider . There is a Play helper class you can use to get hold of the InitialContext called play.api.libs.JNDI . You can use this to lookup your datasource.

Using this benchmark test app as an example and adding the following action:

public Application extends Controller {

    ... 

    public static Result getDataSource() throws NamingException {
        DataSource dataSource = (DataSource) play.api.libs.JNDI.initialContext().lookup("DefaultDS");

        return ok(dataSource.toString());
    }
}

would lookup the datasource bound to the name DefaultDS in the application.conf

Looking at your exception, it seems like you're looking up the InitialContext and then resources with java:comp/.../resourceName in your utility library. This won't play (excuse the pun) well in your Play app out of the box. I would suggest you lookup your DataSource in a Play specific way, as per the example above.