I'm setting datanucleus.DetachAllOnCommit in my jdoconfig.xml file. Why am I
getting "Object Manager has been closed" when I do a query that finds all
entities of a specific class? Is it because I'm not using a transaction?
Previously, before I added datanucleus.DetachAllOnCommit, my dao was doing a
"return (getPersistenceManager().detachCopy(result));" for all find (read-only)
queries and didn't get any errors.
=====================================================================
<jdoconfig
xmlns="http://java.sun.com/xml/ns/jdo/jdoconfig";
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
xsi:noNamespaceSchemaLocation="http://java.sun.com/xml/ns/jdo/jdoconfig";>
<persistence-manager-factory name="transactions-optional">
<!-- omitted other stuff that was already in here, from google -->
<property
name="datanucleus.DetachAllOnCommit"
value="true"
/>
</persistence-manager-factory>
=====================================================================
//dao class, extends org.springframework.orm.jdo.support.JdoDaoSupport
public List<E> findAll() {
final Query query = newQuery();
@SuppressWarnings("unchecked")
final List<E> results = (List<E>) (query.execute());
return (results);
}
private Query newQuery() {
return (getPersistenceManager().newQuery(this.entityClass));
}
=====================================================================
@Before
public void insertUser() throws Exception {
final int entityCountBefore = this.testUtils.entityCounter(User.class);
Assert.assertEquals("entityCount was not 0", 0, entityCountBefore);
final User user1 = new User(this.userName, Long.valueOf(999L));
this.persistedUser1 = this.userDao.makePersistent(user1);
this.log.debug("user1: {}, persistedUser1: {}", user1,
this.persistedUser1);
final User user2 = new User(this.userName + "-2", Long.valueOf(999L));
this.persistedUser2 = this.userDao.makePersistent(user2);
final int entityCountAfter = this.testUtils.entityCounter(User.class);
this.log.debug("entityCountAfter: {}",
Integer.valueOf(entityCountAfter));
Assert.assertEquals("entityCount was not 2", 2, entityCountAfter);
}
@Test
public void findAll() {
final Collection<User> results = this.userDao.findAll();
Assert.assertNotNull("results should not be null", results);
// blows up on this statement, line 138
Assert.assertTrue("results should not be empty", !results.isEmpty());
Assert.assertTrue("results should have 2 entries", results.size() == 2);
final User result = results.iterator().next();
this.log.debug("result: {}", result);
}
=====================================================================
org.datanucleus.exceptions.NucleusUserException: Object Manager has been closed
at
org.datanucleus.ObjectManagerImpl.assertIsOpen(ObjectManagerImpl.java:3876)
at
org.datanucleus.ObjectManagerImpl.getFetchPlan(ObjectManagerImpl.java:376)
at org.datanucleus.store.query.Query.getFetchPlan(Query.java:497)
at
org.datanucleus.store.appengine.query.DatastoreQuery$5.apply(DatastoreQuery.java:508)
at
org.datanucleus.store.appengine.query.DatastoreQuery$5.apply(DatastoreQuery.java:507)
at
org.datanucleus.store.appengine.query.StreamingQueryResult.resolveNext(StreamingQueryResult.java:137)
at
org.datanucleus.store.appengine.query.StreamingQueryResult.size(StreamingQueryResult.java:174)
at
org.datanucleus.store.query.AbstractQueryResult.isEmpty(AbstractQueryResult.java:312)
at
com.objecteffects.waitlist.db.impl.dao.jdo.UserDaoTest.findAll(UserDaoTest.java:138)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at
org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
at
org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at
org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
at
org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
at
org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
at
org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:74)
at
org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31)
at
org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:82)
at
org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:72)
at
org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:240)
at
org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
at
org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
at
org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
at
org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:180)
at
org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:46)
at
org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
=====================================================================
Spring transaction context xml config file.
<beans:beans
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
xmlns:tx="http://www.springframework.org/schema/tx";
xmlns:aop="http://www.springframework.org/schema/aop";
xmlns:beans="http://www.springframework.org/schema/beans";
xsi:schemaLocation="
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd";>
<!-- the transactionManager is declared in the -->
<!-- src/main/resources/spring/jdo-<whatever>-context.xml file. -->
<!-- the transactional advice; what 'happens'; used by the -->
<!-- <aop:advisor/> bean. -->
<tx:advice id="transactionAdvice" transaction-manager="transactionManager">
<tx:attributes>
<!-- for read only, propagation=NOT_SUPPORTED suspends any -->
<!-- current transaction, if there is one. I.e., read only -->
<!-- transactions are run without a transaction. With this, -->
<!-- we can do queries on multiple unowned entities. -->
<tx:method
name="find*"
read-only="true"
propagation="NOT_SUPPORTED"
/>
<!-- always starts a transaction. if any exception is thrown -->
<!-- the transaction is rolled back. -->
<tx:method
name="*"
rollback-for="Throwable"
propagation="REQUIRED"
/>
</tx:attributes>
</tx:advice>
<aop:config>
<aop:pointcut
id="waitlistDaoOperation"
expression="execution(*
com.objecteffects.waitlist.db.api.dao.*.*(..))"
/>
<aop:advisor
advice-ref="transactionAdvice"
pointcut-ref="waitlistDaoOperation"
/>
</aop:config>
</beans:beans>
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