When using JDO persistence manager to begin a transaction,
DatastoreService().getCurrentTransaction() seems to fail.
A unit test:
----------------------------------------------------------
public class TransactionTest{
private final LocalServiceTestHelper helper =
new LocalServiceTestHelper(new
LocalDatastoreServiceTestConfig());
@Before
public void setUp() {
helper.setUp();
}
@After
public void tearDown() {
helper.tearDown();
}
@Test
public void test(){
PersistenceManager pm = PMF.get().getPersistenceManager();
Transaction tx = pm.currentTransaction();
try{
tx.begin();
DatastoreServiceFactory.getDatastoreService().getCurrentTransaction();
tx.commit();
}finally{
if(pm.currentTransaction().isActive()){
pm.currentTransaction().rollback();
}
pm.close();
}
}
}
----------------------------------------------------------
The test fails with stack trace:
----------------------------------------------------------
java.lang.IllegalStateException: java.util.NoSuchElementException
at
com.google.appengine.api.datastore.TransactionStackImpl.peek(TransactionStackImpl.java:
70)
at
com.google.appengine.api.datastore.DatastoreServiceImpl.getCurrentTransaction(DatastoreServiceImpl.java:
307)
at TransactionTest.test(TransactionTest.java:37)
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.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:
31)
at
org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:
73)
at
org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:
46)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:180)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:41)
at org.junit.runners.ParentRunner$1.evaluate(ParentRunner.java:173)
at
org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:
28)
at
org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:
31)
at org.junit.runners.ParentRunner.run(ParentRunner.java:220)
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)
Caused by: java.util.NoSuchElementException
at java.util.LinkedList.getFirst(LinkedList.java:109)
at
com.google.appengine.api.datastore.TransactionStackImpl.peek(TransactionStackImpl.java:
68)
... 26 more
----------------------------------------------------------
As a result, the example shown here:
http://code.google.com/appengine/docs/java/taskqueue/overview.html#Task_Within_Transactions
does not work.
Can someone help shade some light on what I may be missing?
Thanks.
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