yQualifier
     ManagedScheduledExecutorService myScheduledExecutor1;

     @Resource(lookup = "java:comp/concurrent/MyScheduledExecutor",
               name = "java:comp/concurrent/env/MyScheduledExecutorRef")
     ManagedScheduledExecutorService myScheduledExecutor2;
     ...

 @Qualifier
 @Retention(RetentionPolicy.RUNTIME)
 @Target({ ElementType.FIELD, ElementType.METHOD, ElementType.PARAMETER, ElementType.TYPE })
 public @interface MyQualifier {}
 </pre>

 <p>Resource environment references in a deplo