java -jar "/home/instantech/Bureau/JAVA Projects/AfricaBadja/dist/AfricaBadja.jar"
Exception in thread "AWT-EventQueue-0" Local Exception Stack: 
Exception [EclipseLink-30005] (Eclipse Persistence Services - 2.6.1.v20150605-31e8258): org.eclipse.persistence.exceptions.PersistenceUnitLoadingException
Exception Description: An exception was thrown while searching for persistence archives with ClassLoader: jdk.internal.loader.ClassLoaders$AppClassLoader@1affbebc
Internal Exception: java.lang.NullPointerException
    at org.eclipse.persistence.exceptions.PersistenceUnitLoadingException.exceptionSearchingForPersistenceResources(PersistenceUnitLoadingException.java:127)
    at org.eclipse.persistence.jpa.PersistenceProvider.createEntityManagerFactoryImpl(PersistenceProvider.java:115)
    at org.eclipse.persistence.jpa.PersistenceProvider.createEntityManagerFactory(PersistenceProvider.java:188)
    at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:79)
    at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:54)
    at Entity.ManagerEntity.<init>(ManagerEntity.java:28)
    at Manager.AdminManager.<init>(AdminManager.java:21)
    at frontend.FormLogin.<init>(FormLogin.java:26)
    at frontend.FormLogin.lambda$main$0(FormLogin.java:213)
    at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:313)
    at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:770)
    at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
    at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:715)
    at java.base/java.security.AccessController.doPrivileged(Native Method)
    at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
    at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:740)
    at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
    at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
    at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
    at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
    at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
    at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
Caused by: java.lang.NullPointerException
    at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.predeploy(EntityManagerSetupImpl.java:2022)
    at org.eclipse.persistence.internal.jpa.deployment.JPAInitializer.callPredeploy(JPAInitializer.java:100)
    at org.eclipse.persistence.jpa.PersistenceProvider.createEntityManagerFactoryImpl(PersistenceProvider.java:104)
    ... 20 more

<?xml version="1.0" encoding="UTF-8"?>
<persistence >
  <persistence-unit name="AfricaBadjaPU" transaction-type="RESOURCE_LOCAL">
    <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
    <class>Manager.Admin</class>
    <class>Manager.Client</class>
    <class>Manager.Credit</class>
    <class>Manager.Role</class>
    <class>Manager.Produit</class>
    <class>Manager.Commande</class>
    <class>Manager.Depense</class>
    <class>Manager.LigneCommande</class>
    <class>Manager.Sauvegarde</class>
    <class>Manager.HistoryStock</class>
    <class>Manager.Caisse</class>
    <properties>
      <property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/africa_badja_18_19"/>
      <property name="javax.persistence.jdbc.user" value="root"/>
      <property name="javax.persistence.jdbc.driver" value="com.mysql.cj.jdbc.Driver"/>
      <property name="javax.persistence.jdbc.password" value=""/>
      <property name="eclipselink.ddl-generation" value="create-tables"/>
      <property name="eclipselink.ddl-generation.output-mode" value="database"/>
      <property name="eclipselink.ddl-generation-mode" value="ddl_database_generation"/>
      <property name="javax.persistence.schema-generation.database.action" value="drop-and-create"/>
    </properties>
  </persistence-unit>
</persistence>

 /*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package Entity;

import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;

import javax.persistence.Persistence;

/**
 *
 * @author instantech
 */
public class ManagerEntity {

    private final EntityManagerFactory emfactory;
    private final EntityManager entitymanager;

    public ManagerEntity() {
        this.emfactory = Persistence.createEntityManagerFactory("AfricaBadjaPU");
        this.entitymanager = this.emfactory.createEntityManager();
    }

    public EntityManagerFactory getEmfactory() {
        return emfactory;
    }

    public EntityManager getEntitymanager() {
        return entitymanager;
    }

    public void close() {
        this.entitymanager.close();
        this.emfactory.close();
    }

    public boolean save(Object object) {
        try {
            this.getEntitymanager().getTransaction().begin();
            this.getEntitymanager().persist(object);
            this.getEntitymanager().getTransaction().commit();
            this.close();
            return true;
        } catch (Exception e) {
                System.err.println("Error : " + e.getMessage());
        } 

        return false;

    }

    public boolean remove(Object object, Integer id) {
        try {
            this.getEntitymanager().getTransaction().begin();
            object = this.getEntitymanager().find(object.getClass(), id);
            this.getEntitymanager().remove(object);
            this.getEntitymanager().getTransaction().commit();
            this.close();
            return true;
        } catch (Exception e) {
            System.err.println("Error : " + e.getMessage());
        }

        return false;
    }


}