<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.1" xmlns="..." xmlns:xsi="..." xsi:schemaLocation="...">
  <persistence-unit name="WebEJBPU1" transaction-type="JTA">
    <jta-data-source>jdbc/pinets_web1_dev_local</jta-data-source>
    <class>controller.org.param.Org</class>
    <exclude-unlisted-classes>true</exclude-unlisted-classes>
    <properties>
      <property name="eclipselink.logging.session" value="false"/>
      <property name="eclipselink.logging.level" value="WARNING"/>
      <property name="eclipselink.logging.level.sql" value="WARNING"/>
      <property name="eclipselink.logging.parameters" value="true"/>
      <property name="eclipselink.canonicalmodel.subpackage" value="prod"/>
    </properties>
  </persistence-unit>
  <persistence-unit name="WebEJBPU2" transaction-type="JTA">
    <jta-data-source>jdbc/pinets_web2_dev_local</jta-data-source>
    <class>controller.org.param.Org</class>
    <exclude-unlisted-classes>true</exclude-unlisted-classes>
    <properties>
      <property name="eclipselink.logging.session" value="false"/>
      <property name="eclipselink.logging.level" value="WARNING"/>
      <property name="eclipselink.logging.level.sql" value="WARNING"/>
      <property name="eclipselink.logging.parameters" value="true"/>
      <property name="eclipselink.canonicalmodel.subpackage" value="prod"/>
    </properties>
  </persistence-unit>
</persistence>

@Entity
@Cacheable(true)
@Cache
(
  size = 5000,
  isolation = CacheIsolationType.SHARED,
  expiry = -1
)
@ReadOnly
@NamedQueries(
{
  @NamedQuery(name = "Org.findAll", query = "SELECT o FROM Org o")
})
public class Org implements Serializable
{
  private static final long serialVersionUID = 1L;
  @Id
  @Basic(optional = false)
  @NotNull
  @Column(name = "org_id")
  private Integer orgId;
  @Basic(optional = false)
  @NotNull
  @Size(min = 1, max = 78)
  private String orgfname;

  public Org(){}
  ... getters and setters for orgId and orgfname fields
  ... overridden hashCode(), equals() and toString() methods
}

@Singleton
public class COrg
{
  @PersistenceUnit(unitName = "WebEJBPU1")
  private EntityManagerFactory _emf1;
  @PersistenceUnit(unitName = "WebEJBPU2")
  private EntityManagerFactory _emf2;

  public void cacheOrgs()
  {
    Query q = _emf1.createEntityManager().createNamedQuery("Org.findAll");
    List<Org> rl = q.getResultList();
  }

  public List<Org> getOrgs(int rowCount, int emNum)
  {
    Query q = (emNum == 1 ? _emf1.createEntityManager().createNamedQuery("Org.findAll") : _emf2.createEntityManager().createNamedQuery("Org.findAll"));
	
    q.setHint("eclipselink.cache-usage", "CheckCacheOnly");
    q.setHint("eclipselink.read-only", "true");

    return q.setMaxResults(rowCount).getResultList();
  }
}