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THE 
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More information about why this is about OSGI.
The Exception throws only when running the application as Eclipse RCP 
but the junit test case is work fine as expected.

this was the exception stack trace:
java.lang.IllegalAccessError: tried to access method 
org.hibernate.cfg.Mappings.<init>
(Ljava/util/Map;Ljava/util/Map;Ljava/util/Map;Ljava/util/Map;Ljava/util
/Map;Ljava/util/Map;Ljava/util/Map;Ljava/util/List;Ljava/util/List;Lorg
/hibernate/cfg/NamingStrategy;Ljava/util/Map;Ljava/util/Map;Ljava/util/
Map;Ljava/util/List;Ljava/util/Map;Ljava/util/Map;)V from class 
org.hibernate.cfg.ExtendedMappings
	at org.hibernate.cfg.ExtendedMappings.<init>
(ExtendedMappings.java:65)
	at 
org.hibernate.cfg.AnnotationConfiguration.createExtendedMappings
(AnnotationConfiguration.java:166)
	at 
org.hibernate.cfg.AnnotationConfiguration.secondPassCompile
(AnnotationConfiguration.java:254)
	at org.hibernate.cfg.Configuration.buildSessionFactory
(Configuration.java:1286)
	at 
net.vata.my.test.rcp.core.model.hibernate.HibernateUtils.<clinit>
(HibernateUtils.java:23)
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Unknown Source)
	at net.vata.my.test.rcp.ui.Application.run
(Application.java:25)