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The Java Persistence API (JPA) is a Java specification for accessing, persisting, and managing data between Java objects/classes and a relational database. It is part of the EJB 3.0 specification and is the industry standard approach for Object to Relational Mapping (ORM).

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IntelliJ with Maven compilation

Clear the cache or reimport Sometimes Intellij gets in a tangle with projects. When that happens the general approach is as follows: Try Build | Rebuild Project If no, check that the project will c …
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