[JBoss] Why java:comp/env jndi lookups work for transactionmanager, but not for a datasource?

I use jboss 7.4. I tried:

@Resources({
@Resource(name = "VDB", type = DataSource.class, mappedName = "java:/jdbc/VDB"),
@Resource(name = "TransactionManager", type = TransactionManager.class, mappedName = "java:/TransactionManager")
})
public class VManagerBean extends ... { // an ejb2 stateless session bean
...
private TransactionManager getTransactionManager() {
InitialContext ic;
try {
ic = new InitialContext();
TransactionManager tm = (TransactionManager) ic.lookup("java:comp/env/TransactionManager");
return tm;
} catch (NamingException e) {
throw new RuntimeException(e);
}
}
private DataSource getDataSource() {
InitialContext ic;
try {
ic = new InitialContext();
DataSource ds = (DataSource) ic.lookup("java:comp/env/VDB");
return ds;
} catch (NamingException e) {
throw new RuntimeException(e);
}
}


Now getTransaction() works fine, but getDataSource() not: even jboss stops running after getDataSource(). Why?

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