Adding persistence to a REST application error - web-services

Question

How can I user persistency in my REST application?
I want to use #Inject and #PersistenceUnit annotation to instantiate my needed PersistencyManager object,
by when I call the persistency functionality by REST service I get an error:
[2014-03-15 05:05:45,472] Artifact CubieboardGPIO:war: Error during artifact deployment. See server log for details.
[2014-03-15 05:05:45,473] Artifact CubieboardGPIO:war: javax.ejb.EJBException: The bean encountered a non-application exception; nested exception is:
org.apache.openejb.OpenEJBRuntimeException: java.lang.IllegalStateException: ContainerBase.addChild: start: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/]]
This is my Rest:
#Inject
private PersistenceManager persistenceManager;
#GET
#Path("/activate")
public String activate(#QueryParam("pin") int pin) {
persistenceManager = new PersistenceManager();
// URI : /cubieboard/gpio/activate?pin=67
String[] messages = _activate(pin);
StringBuilder sb = new StringBuilder();
sb.append(ConfigurationManager.getConfiguration("ACTIVATE_MESSAGE")+"\n");
sb.append("Persistence:\t"); sb.append(messages[0]); sb.append("\n");
sb.append("Terminal Response:\t"); sb.append(messages[1]); sb.append("\n");
return sb.toString();
}
This is PersisteneManager:
#Stateless
public class PersistenceManager {
#PersistenceUnit(name = "cubieDB")
private static EntityManagerFactory factory;
private EntityManager em;
public PersistenceManager(){
// factory = Persistence.createEntityManagerFactory(ConfigurationManager.getConfiguration("PERSISTENCE_UNIT_NAME"));
// factory = Persistence.createEntityManagerFactory("cubieDB");
em = factory.createEntityManager();
}
public List<Operation> getAllOperations() {
Query q = em.createQuery("SELECT op FROM Operation op");
List<Operation> ops = q.getResultList();
return ops;
}
public void persist(Operation operation) {
em.getTransaction().begin();
em.persist(operation);
em.getTransaction().commit();
}
public void deleteAll(){
em.getTransaction().begin();
Query q = em.createNativeQuery("DELETE FROM Operation");
q.executeUpdate();
em.getTransaction().commit();
}
#Override
protected void finalize() throws Throwable {
super.finalize();
em.close();
}
}
And this is my persistence.xml:
<?xml version="1.0" encoding="UTF-8"?>
<persistence xmlns="http://xmlns.jcp.org/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence
http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd"
version="2.1">
<persistence-unit name="cubieDB" transaction-type="RESOURCE_LOCAL">
<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
<class>com.sakhoshdel.cubieboard.gpio.persistence.Operation</class>
<properties>
<!--<property name="eclipselink.ddl-generation" value="drop-and-create-tables"/>-->
<property name="eclipselink.ddl-generation" value="create-tables"/>
<!--<property name="javax.persistence.schema-generation-action" value="drop-and-create"/>-->
<!--<property name="javax.persistence.schema-generation-target" value="database-and-scripts"/>-->
<property name="javax.persistence.jdbc.driver" value="org.apache.derby.jdbc.EmbeddedDriver" />
<property name="javax.persistence.jdbc.url" value="jdbc:derby:cubieDB;create=true" />
</properties>
</persistence-unit>
</persistence>
Also when I call the persistence functionality from a normal class it runs. but when I want to deploy it I get error. I am using TomEE for application server.
Thank you

Answer 1

Well ejb constructor shouldnt be used (shouldnt even be called in last versions). Injection of static field is not recommanded neither.
Finally maybe just use a jta persistence unit and remove the em.getTransaction calls.
Side note: tomee comes with openjpa so you need to provide eclipselink if you want it