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1. Hibernate different type pojo mapping    stackoverflow.com

I have a problem with a mapping for this structure that i designed 

public abstract class A<T> {
 private int discriminator_value = -1;
 private T value;
 //...
}

public class One extends A<String> {

 ...

2. Error while Creating Pojo Class in Oracle    forum.hibernate.org

It would appear that the particular column of interest has two different Java classes mapping to it, so Hibernate isn't sure which one to use. How many classes have properties that map to that particular column? There should probably only be one. Another Java class may have used template code, or cut and paste something and not made a change. Take ...