Cannot obtain DataSource using JNDI Name lookup

Hi,
I'm having a problem to obtain DataSource using JNDI Name lookup.
Please see my code and error below:

Connection connection = null;
DataSource dataSource = null;
try

{ final Context initContext = new InitialContext(); dataSource = (DataSource) initContext.lookup("java:/MyDataSource"); connection = dataSource.getConnection(); }

catch (Exception e)

{ LOGGER.error(e); }

Caused by: javax.naming.NamingException: JBAS011832: Could not dereference object [Root exception is java.lang.NullPointerException]
at org.jboss.as.naming.NamingContext.getObjectInstance(NamingContext.java:526)
at org.jboss.as.naming.NamingContext.lookup(NamingContext.java:236)
at org.jboss.as.naming.InitialContext$DefaultInitialContext.lookup(InitialContext.java:233)
at org.jboss.as.naming.NamingContext.lookup(NamingContext.java:188)
at org.jboss.as.naming.NamingContext.lookup(NamingContext.java:184)
at javax.naming.InitialContext.lookup(InitialContext.java:411) [rt.jar:1.7.0_45]
at javax.naming.InitialContext.lookup(InitialContext.java:411) [rt.jar:1.7.0_45]
... 10 more
Caused by: java.lang.NullPointerException
at org.jboss.as.naming.NamingContext.getObjectInstance(NamingContext.java:522)
... 17 more