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Entity Manager is always NULL - Weblogic / Netbeans

 
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Hi,

I can inject the entity manager to one of my EJB using @PersistenceContext.
However, when I try to remove this entity manager injection, and inject the entity manager from the next level, the entity manager is always null.
Please refer to my code below:


My persistence.xml





The 1st EJB:





2nd EJB



My local business interface




Please refer to my environment:

IDE: NetBeans IDE 8.0 (Build 201403101706)
Java: 1.7.0_67; Java HotSpot(TM) 64-Bit Server VM 24.65-b04
Runtime: Java(TM) SE Runtime Environment 1.7.0_67-b01
System: Windows 8 version 6.2 running on amd64; Cp1252;
WebLogic Server Version: 12.1.3.0.0




Anyone can give me some idea?

Thanks in advance
 
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