JPA Persistence class workaround

Question

I'm using EclipseLink as the JPA provider but on calling:

Persistence.createEntityManagerFactory("emfactory1")

I get this exception:

java.lang.ClassNotFoundException: javax.persistence.Persistence

The pom.xml file reads as follows:

<dependency>
  <groupId>org.eclipse.persistence</groupId>
  <artifactId>eclipselink</artifactId>
  <version>2.6.4</version>
</dependency>

On looking around I found a suggestion to fetch only the JPA API:

<artifactId>javax.persistence</artifactId>

But that still gives me the same exception. Suffice to say I'm now stranded and in need of assistance.

Edit

Here's a screenshot of the output

@YCF_L not sure i understand your question but i've used the class to get an instance of the EntityManagerFactory — Eliud Daniels, Aug 22 '17 at 14:33
did you import `import javax.persistence.Persistence;` in your class? — Youcef LAIDANI, Aug 22 '17 at 14:44
can you please check the name of `persistence-unit` in `persistance.xml`, you should to find `emfactory1` — Youcef LAIDANI, Aug 22 '17 at 15:03
the argument `emfactory1` should be the `name` attribute provided in the `persistence.xml` file? — Eliud Daniels, Aug 22 '17 at 15:14
@NikosParaskevopoulos I've created a `main` function which calls the class methods where I've implemented the `EntityManager` logic — Eliud Daniels, Aug 22 '17 at 15:20
@YCF_L this is exception at runtime, so compilation (and import) assume is good, — Jacek Cz, Aug 22 '17 at 15:26
Are you running it from command line? The essence is: are you actually including the dependencies *at runtime*? You can try the [exec maven plugin](http://www.mojohaus.org/exec-maven-plugin/java-mojo.html). — Nikos Paraskevopoulos, Aug 22 '17 at 15:56
i assume this is a problem of maven and not of jpa, so can you please share the full stacktrace? — Youcef LAIDANI, Aug 22 '17 at 19:11

score 0 · Accepted Answer · answered May 09 '19 at 08:25

Reason of Error: Data source is missing in your code.

Try this.

InitialContext ctx = new InitialContext();
                        DataSource ds = (DataSource) ctx.lookup(DATA_SOURCE_NAME);

                        Map<String, Object> properties = new HashMap<>();
                        properties.put(PersistenceUnitProperties.NON_JTA_DATASOURCE, ds);
                        entityManagerFactory = Persistence.createEntityManagerFactory(
                                PERSISTENCE_UNIT_NAME, properties);

JPA Persistence class workaround

1 Answers1