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javax.ejb.EJBException java.lang.IllegalStateException: Unable to retrieve EntityManagerFactory for unitName


javax.ejb.EJBException java.lang.IllegalStateException: Unable to retrieve EntityManagerFactory for unitName

By : user2955270
Date : November 22 2020, 10:38 AM
like below fixes the issue The obvious problem is that you didn't specify a jta-data-source and the transaction-type in your persistence.xml.
A jta-data-source is specified like this:
code :
  <persistence-unit name="Hospital">
    <jta-data-source>jdbc/sample</jta-data-source>
  </persistence-unit>
<persistence-unit name="Hospital" transaction-type="JTA">


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java.lang.IllegalStateException: Unable to retrieve EntityManagerFactory for unitName CrudPU

java.lang.IllegalStateException: Unable to retrieve EntityManagerFactory for unitName CrudPU


By : j.doe1
Date : March 29 2020, 07:55 AM
like below fixes the issue Can you double check where is persistence.xml located within your war file? It should be on myapp.war/WEB-INF/classes/META-INF/persistence.xml.
If you use standard maven layout, your persistence.xml should be on src/main/resources/META-INF/persistence.xml within the source code project
java.lang.illegalstateexception unable to retrieve entitymanagerfactory for unitname null

java.lang.illegalstateexception unable to retrieve entitymanagerfactory for unitname null


By : user3171386
Date : March 29 2020, 07:55 AM
With these it helps persistence.xml should be put inside the folder CLASS_PATH_ROOT/META-INF.
If you are using Maven 's standard project layout , the path should be src/main/resources/META-INF/persistence.xml
java.lang.IllegalStateException: Unable to retrieve EntityManagerFactory for unitName HorizonPU with Arquillian

java.lang.IllegalStateException: Unable to retrieve EntityManagerFactory for unitName HorizonPU with Arquillian


By : danh
Date : March 29 2020, 07:55 AM
around this issue I got to the bottom of this one eventually. If you are deploying a web-app, then the persistence.xml file needs to go in WEB-INF/classes/META-INF/, in other words META-INF should not be at the top level of the archive. Typically, the documentation for Arquillian is not terribly clear on how to achieve this but the solution for my problem was to change the deployment method in my tests to:
code :
WebArchive archive = ShrinkWrap.create(WebArchive.class, "testarchive.war")
        .addClasses(Budget.class, BudgetLine.class, BudgetSection.class, BudgetFacade.class)
        .addAsResource("META-INF/persistence.xml")
        .addAsWebInfResource(EmptyAsset.INSTANCE, "beans.xml");
JavaEE 6: java.lang.IllegalStateException: Unable to retrieve EntityManagerFactory for unitName null

JavaEE 6: java.lang.IllegalStateException: Unable to retrieve EntityManagerFactory for unitName null


By : Xiaojie
Date : March 29 2020, 07:55 AM
With these it helps It happens if you forget the persistence.xml file or if the entity is not set correctly in the file.
Unable to fix java.lang.IllegalStateException: Unable to retrieve EntityManagerFactory for unitName

Unable to fix java.lang.IllegalStateException: Unable to retrieve EntityManagerFactory for unitName


By : Hugo
Date : March 29 2020, 07:55 AM
like below fixes the issue The /META-INF/persistence.xml must end up in runtime classpath, not in web resources. So, you need to put it in Java source folder, not in Web content folder. The persistence.xml is not related to web resources, but to Java beans.
Move it up:
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