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Weird @Cache annotation usage error

 
Greenhorn
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I added the following annotation to enable cache to one of my EJB3 entities to test caching where I use Hibernate as the persistence provider:



I added the following to persistence.xml :



And when I try to compile I get the following error:

/persistence/F.class): warning: Cannot find annotation method 'usage()' in type 'org.hibernate.annotations.Cache': class file for org.hibernate.annotations.Cache not found
An exception has occurred in the compiler (1.6.0_16). Please file a bug at the Java Developer Connection (http://java.sun.com/webapps/bugreport) after checking the Bug Parade for duplicates. Include your program and the following diagnostic in your report. Thank you.
com.sun.tools.javac.code.Symbol$CompletionFailure: class file for org.hibernate.annotations.CacheConcurrencyStrategy not found



Can anyone help me out here and let me know what I need to do or am doing wrong currently ?

Thanks.
 
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