I would like to initialize my local data store with some data using a
regular Java program (I do not want to start the Development Server
and call a service/servlet), and I'm getting the following exception
»»» EXCEPTION «««
Exception in thread "main" java.lang.NullPointerException: No API
environment is registered for this thread.
at
com.google.appengine.api.datastore.DatastoreApiHelper.getCurrentAppId(DatastoreApiHelper.java:
70)
at
com.google.appengine.api.datastore.DatastoreApiHelper.getCurrentAppIdNamespace(DatastoreApiHelper.java:
80)
at com.google.appengine.api.datastore.Query.<init>(Query.java:84)
at
org.datanucleus.store.appengine.query.DatastoreQuery.validate(DatastoreQuery.java:
649)
at
org.datanucleus.store.appengine.query.DatastoreQuery.performExecute(DatastoreQuery.java:
215)
at
org.datanucleus.store.appengine.query.JPQLQuery.performExecute(JPQLQuery.java:
77)
at org.datanucleus.store.query.Query.executeQuery(Query.java:1489)
at org.datanucleus.store.query.Query.executeWithMap(Query.java:1398)
at org.datanucleus.jpa.JPAQuery.getResultList(JPAQuery.java:163)
at cyberRabbit.billingSite.server.dao.PersonDAO.clean(PersonDAO.java:
66)
at
cyberRabbit.billingSite.test.InitializeDatabase.cleanDatastore(InitializeDatabase.java:
36)
at
cyberRabbit.billingSite.test.InitializeDatabase.initDatastore(InitializeDatabase.java:
22)
at
cyberRabbit.billingSite.test.InitializeDatabase.main(InitializeDatabase.java:
18)
«««
»»» CODE «««
public class InitializeDatabase {
public static void main(String[] args) {
new InitializeDatabase().initDatastore();
}
public void initDatastore() {
cleanDatastore();
(...)
}
private static void cleanDatastore() {
try {
// No transaction
PersonDAO.clean();
} finally {
if (EMF.getEntityManager().getTransaction().isActive())
{
System.out.println("RB!!!");
EMF.getEntityManager().getTransaction().rollback();
}
EMF.close();
}
}
}
public class PersonDAO {
(...)
public static void clean() {
EntityManager em = EMF.getEntityManager();
Query query = em.createQuery("SELECT p FROM Person p");
for (Object personObj : query.getResultList()) {
Person person = (Person)personObj;
em.remove(person);
}
}
(...)
}
public final class EMF {
private static final EntityManagerFactory emfInstance = Persistence
.createEntityManagerFactory("transactions-optional");
private static ThreadLocal<EntityManager> threadLocal = new
ThreadLocal<EntityManager>();
private EMF() {
}
public static EntityManager getEntityManager() {
if (threadLocal.get() == null) {
threadLocal.set(emfInstance.createEntityManager());
}
return threadLocal.get();
}
public static void close() {
EntityManager entityManager = getEntityManager();
entityManager.close();
threadLocal.set(null);
}
«««
Is there a way to do this? How?
Thanks in advance
António Casqueiro
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