I created a new repository and a new Project in JBPM 6.4 Inside project I created a persistence.xml

    <?xml version="1.0" encoding="UTF-8" standalone="no"?>
    <persistence xmlns="http://java.sun.com/xml/ns/persistence" xmlns:orm="http://java.sun.com/xml/ns/persistence/orm" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="2.0" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd http://java.sun.com/xml/ns/persistence/orm http://java.sun.com/xml/ns/persistence/orm_2_0.xsd">
        <persistence-unit name="demox:com.prueba:1.0" transaction-type="JTA">
            <provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
            <jta-data-source>java:jboss/datasources/jbpmDS</jta-data-source>
            <class>demox.com.prueba.Estudiante</class>
            <exclude-unlisted-classes>true</exclude-unlisted-classes>
            <properties>
                <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect"/>
                <property name="hibernate.max_fetch_depth" value="3"/>
                <property name="hibernate.hbm2ddl.auto" value="update"/>
                <property name="hibernate.show_sql" value="false"/>
                <property name="hibernate.id.new_generator_mappings" value="false"/>
                <property name="hibernate.transaction.jta.platform" value="org.hibernate.service.jta.platform.internal.JBossAppServerJtaPlatform"/>
            </properties>
        </persistence-unit>
    </persistence>

Also I defined a persistible object (pojo decorated with @Entity)

Now I have a simple process with only a one script task

But when I deployed the process in my DB the Student Table is created...

package demox.com.prueba;
    
    /**
     * This class was automatically generated by the data modeler tool.
     */
    
    @javax.persistence.Entity
    public class Estudiante implements java.io.Serializable
    {
    
       static final long serialVersionUID = 1L;
    
       @javax.persistence.GeneratedValue(strategy = javax.persistence.GenerationType.AUTO, generator = "ESTUDIANTE_ID_GENERATOR")
       @javax.persistence.Id
       @javax.persistence.SequenceGenerator(name = "ESTUDIANTE_ID_GENERATOR", sequenceName = "ESTUDIANTE_ID_SEQ")
       private java.lang.Long id;
    
       @org.kie.api.definition.type.Label(value = "name")
       private java.lang.String name;
    
       public Estudiante()
       {
       }
    
       public java.lang.Long getId()
       {
          return this.id;
       }
    
       public void setId(java.lang.Long id)
       {
          this.id = id;
       }
    
       public java.lang.String getName()
       {
          return this.name;
       }
    
       public void setName(java.lang.String name)
       {
          this.name = name;
       }
    
       public Estudiante(java.lang.Long id, java.lang.String name)
       {
          this.id = id;
          this.name = name;
       }
    
    }

So the question is how get inside this scriptTask the reference to this EntityManger to persist this pojo?

I tried:

    demox.com.prueba.Estudiante est=new demox.com.prueba.Estudiante();
    String pu="demox:com.prueba:1.0";
    
    //javax.persistence.EntityManagerFactory emf = javax.persistence.Persistence.createEntityManagerFactory( pu );
    
    javax.persistence.EntityManagerFactory emf = (javax.persistence.EntityManagerFactory) kcontext.getKnowledgeRuntime().getEnvironment()
        .get(org.kie.api.runtime.EnvironmentName.ENTITY_MANAGER_FACTORY); # tried also EnvironmentName.CMD_SCOPED_ENTITY_MANAGER
      
    System.out.println("Entity manager " + emf );
    
    emf.persist(est);

But when used this code the EntityManager is a reference to a jbpm persistence unit not a instance to my persistence unit(demo) which don't contain my pojo class (unknown Entity)

so how can acces to this persistence unit in my script task?