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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0px; border-collapse: collapse; padding: 0 0 10px 0; padding-top: 10px"> <span class="diffremovedchars" style="background-color:#ffe7e7;text-decoration:line-through;">Missing</span> <span class="diffaddedchars" style="background-color:#ddfade;">Hello,<br /><br />missing</span> <span class="diffcontext"> support for generics is clearly apparent in conjuction with use of</span> <span class="diffremovedchars" style="background-color:#ffe7e7;text-decoration:line-through;"> @</span> <span class="diffcontext">javax.persistence.MappedSuperclass</span> <span class="diffaddedchars" style="background-color:#ddfade;"> annotation</span> <span class="diffcontext">.<br /><br />Let's have a generic superclass:<br /><br />{code:title=HelloWorldSuperclass.java|borderStyle=solid}<br />@MappedSuperclass<br />public abstract class HelloWorldSuperclass<KeyType, ValueType> {<br /> @EmbeddedId<br /> private KeyType key;<br /><br /> @Column(name="value")<br /> private ValueType value;<br />}<br />{code}<br /><br />Then define type specific subclass:<br /><br />{code:title=HelloWorldInteger.java|borderStyle=solid}<br />@Entity<br />public</span> <span class="diffremovedchars" style="background-color:#ffe7e7;text-decoration:line-through;"> abstract</span> <span class="diffcontext"> class HelloWorldInteger extends HelloWorldSuperclass<Integer, String> {<br />}<br />{code}<br /><br />And another one for variety sake:<br /><br />{code:title=HelloWorldString.java|borderStyle=solid}<br />@Entity<br />public</span> <span class="diffremovedchars" style="background-color:#ffe7e7;text-decoration:line-through;"> abstract</span> <span class="diffcontext"> class HelloWorldString extends HelloWorldSuperclass<String, String> {<br />}<br />{code}<br /><br />*Resulting metamodel classes do not have correct types where expected. All parametrized types are translated to mere Object in superclass and subclasses.*<br /><br />{code:title=generated metamodel classes|borderStyle=solid}<br />@Generated(value = "org.hibernate.jpamodelgen.JPAMetaModelEntityProcessor")<br />@StaticMetamodel(HelloWorldSuperclass.class)<br />public abstract class HelloWorldSuperclass_ {<br /> public static volatile SingularAttribute<HelloWorldSuperclass, Object> value;<br /> public static volatile SingularAttribute<HelloWorldSuperclass, Object> key;<br />}<br /><br />@Generated(value = "org.hibernate.jpamodelgen.JPAMetaModelEntityProcessor")<br />@StaticMetamodel(HelloWorldInteger.class)<br />public abstract class HelloWorldInteger_ extends HelloWorldSuperclass_ {<br />}<br /><br />@Generated(value = "org.hibernate.jpamodelgen.JPAMetaModelEntityProcessor")<br />@StaticMetamodel(HelloWorldString.class)<br />public abstract class HelloWorldString_ extends HelloWorldSuperclass_ {<br />}<br />{code}<br /><br />*This is rather inconvenient and impossible to use reasonably further on in CriteriaBuilder.*<br /><br />Tomas</span>
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