JPA: Why 'No Persistence Provider' Error When Creating EntityManagerFactory?

JPA: "No Persistence provider for EntityManager named"

When attempting to create an EntityManagerFactory using Persistence.createEntityManagerFactory("agisdb"), an error occurred stating "No Persistence provider for EntityManager named agisdb." Despite having a persistence.xml file with the correct name in the META-INF directory, the issue persists.

Solution

The underlying problem is the absence of the necessary JAR file in the application's classpath. To resolve this:

1. Include "hibernate-entitymanager.jar" for older versions or "hibernate-core.jar" for newer versions in the application's classpath.

2. For development environments like Eclipse:

   • Navigate to Project Properties -> Java Build Path -> Libraries.
   • Add the JAR file as a library.

3. For command-line applications:

   • Place the JAR file in the /lib directory of the application.

After ensuring the necessary JAR file is present in the classpath, the application should be able to successfully create an EntityManagerFactory without encountering the "No Persistence provider" error.

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