java.lang.ClassNotFoundException: javax.persistence.Persistence cannot be found with JPA

Question

I'm praticing with JPA API. I got an error

java.lang.ClassNotFoundException: javax.persistence.Persistence cannot be found

My code below:

EntityManagerFactory emf;
emf = Persistence.createEntityManagerFactory("mail");
EntityManager em = emf.createEntityManager();
Query query = em.createQuery("SELECT v FROM Version v");
List<Version> versions = query.getResultList();

The error at line emf = Persistence.createEntityManagerFactory("mail");

Any solution?

Persistence and EntityManagerFactory normally are provided by the same jar (e.g. javaee-api-7.0.jar), can you tell us which one you are using? — Thomas
– Thomas, Commented Sep 3, 2014 at 8:23
Which JPA provider are you using? Are you running standalone or in a (JEE) container? If standalone, compare the (runtime) classpath to your build path to find missing .jars in the classpath. — JimmyB
– JimmyB, Commented Sep 3, 2014 at 8:25
OK. I missed javax.persistence.jar in my classpath. Added and problem solved now. Thanks you. — gamo
– gamo, Commented Sep 3, 2014 at 8:34

zbig · Accepted Answer · 2014-09-03 08:34:42Z

31

You are trying to set up a standalone JPA project. In order to do so you need a JPA provider jars. The two more popular providers are Eclipselink and Hibernate. If you are using maven you can add dependencies to their implementations.

For Eclipselink

<dependency>
    <groupId>org.eclipse.persistence</groupId>
    <artifactId>eclipselink</artifactId>
    <version>2.5.1</version>
</dependency>

For Hibernate

<dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-core</artifactId>
    <version>4.3.6.Final</version>
</dependency>
<dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-entitymanager</artifactId>
    <version>4.3.6.Final</version>
</dependency>

If you are not using maven you can download their implementations from their sites and put it in your classpath.

For Eclipselink: http://www.eclipse.org/eclipselink/downloads/
For Hibernate: http://hibernate.org/orm/

Some JPA quickstarts are recommending to add only the JPA API (interface declarations only) dependencies with maven.

    <dependency>
        <groupId>org.eclipse.persistence</groupId>
        <artifactId>javax.persistence</artifactId>
        <version>2.1.0</version>
    </dependency>

or

    <dependency>
        <groupId>org.hibernate.javax.persistence</groupId>
        <artifactId>hibernate-jpa-2.1-api</artifactId>
        <version>1.0.0.Final</version>
    </dependency>

This approach will be successful only in server environment as the server will provide appropriate implementation at runtime.

edited Sep 3, 2014 at 8:34

answered Sep 3, 2014 at 8:26

zbig

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2 Comments

gamo Over a year ago

Thanks you. The problem is I missed javax.persistence.jar in my classpath.

zhaozhi Over a year ago

hibernate-core is needed

Atul Jain · Accepted Answer · 2018-09-26 06:38:24Z

3

Right Click on Project -> Properties -> Search "Deployment Assembly" -> Add Maven Dependencies.

answered Sep 26, 2018 at 6:38

Atul Jain

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Comments

Aditya Porwal · Accepted Answer · 2021-03-10 09:01:14Z

-1

if using maven , add below dependency in Pom.xml

<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>4.0.1</version>
<scope>provided</scope>
</dependency>

then clean install maven

answered Mar 10, 2021 at 9:01

Aditya Porwal

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