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Editorial Team
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Asked: 2026-05-14T03:02:41+00:00

I am new to Java Persistence API . I have just learnt it and

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I am new to Java Persistence API. I have just learnt it and now want to use it in my Java Desktop Application. But I have the following questions regarding it:

Q1. Which JPA implementation is smallest in size (as I want to have my application’s size as small as possible)?

Q2. How to find the value of the <provider> tag in the persistence.xml file. I know that its value is vendor specific but I couldn’t find the value for the JPA implementation downloaded from here.

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  1. Editorial Team

    Q1. Which JPA implementation is smallest in size (as I want to have my application’s size as small as possible)?

    For JPA 1.0:

    • Hibernate Entity Manager 3.4.0.GA: ~4.9MB
    • EclipseLink 1.1.3: ~4.7MB
    • OpenJPA 1.2.2: ~2.7MB (I’m not sure for this one, not tested for now so I may be missing some jars)

    I would stay away from TopLink Essentials.

    For JPA 2.0:

    • DataNucleus 2.0.3: ~3.7MB
    • EclipseLink 1.2 and 2.0+: ~4.8MB
    • Hibernate Entity Manager 3.5.0-Final: ~5.8MB
    • OpenJPA 2.0.0-beta3: not measured (still in beta)

    These measures have been done on my pet project (including dependencies except the JDBC driver). Personally, I wouldn’t base my choice on the size only, even for a desktop app.

    Q2. How to find the value of the tag in the persistence.xml file.

    • DataNucleus: org.datanucleus.jpa.PersistenceProviderImpl
    • EclipseLink: org.eclipse.persistence.jpa.PersistenceProvider
    • Hibernate: org.hibernate.ejb.HibernatePersistence
    • OpenJPA: org.apache.openjpa.persistence.PersistenceProviderImpl
    • TopLink Essentials: oracle.toplink.essentials.PersistenceProvider
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