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EJB3.0 example

 
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I have created an ejb3.0 entity bean example with @ManytoOne relation. Iam getting a strange error



my example code is as follows:
Book.java

Author.java


my stateful session bean has following code :



Iam using Mysql, can you please tell me what can be the fix for this?
 
santhoshkumar samala
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I was able to solve the above problem..

I have added above getId method of each entity.
 
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