When you use Maven you have to add in your POM following dependency:
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-jpamodelgen</artifactId>
<version>5.3.7.Final</version>
</dependency>
Now you have to add folder target\generated-sources\annotations to your classpath as by default, the classes will be generated in this folder only. You go in
Project Build Path -> Configure Build Path -> Java Build Path -> Source and there make add folder
Now you can use the metamodel entity classes as User_ made from entity User

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