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https://issues.apache.org/jira/browse/JENA-400?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13584130#comment-13584130
]
Andy Seaborne commented on JENA-400:
------------------------------------
Thanks for the test case.
It's an initialization loop between ModelFactory calling RIOT and ARQ calling
RIOT calling ModelFactory. Need to make the locking ordering consistent (e.g.
ARQ.init ensure core Jena as had a chance to initialize first)
> Hang when running tests that depend on Jena in parallel using Maven
> -------------------------------------------------------------------
>
> Key: JENA-400
> URL: https://issues.apache.org/jira/browse/JENA-400
> Project: Apache Jena
> Issue Type: Bug
> Components: Jena
> Affects Versions: Jena 2.10.0
> Reporter: Stephen Owens
> Assignee: Andy Seaborne
> Priority: Minor
>
> Running multiple test classes that use Jena can cause a hang during JUnit
> test execution. We reduced this to two separate test classes, each with only
> one test, roughly as follows:
> import java.io.IOException;
> import org.junit.Test;
> import com.hp.hpl.jena.rdf.model.ModelFactory;
> public class FirstJenaTest
> {
> @Test
> public void test() throws IOException
> {
> ModelFactory.createDefaultModel();
> }
> }
> TEST 2:
> import org.junit.Test;
> import com.hp.hpl.jena.query.Query;
> public class SecondJenaTest
> {
> @Test
> public void test()
> {
> new Query();
> }
> }
> pom.xml:
> ...
> <plugin>
> <groupId>org.apache.maven.plugins</groupId>
> <artifactId>maven-surefire-plugin</artifactId>
> <configuration>
> <parallel>classes</parallel>
> <includes>
> <include>**/FirstJenaTest.java</include>
> <include>**/SecondJenaTest.java</include>
> </includes>
> </configuration>
> . . .
> </plugin>
> ...
> Here's part of the thread dump we captured:
> "pool-1-thread-2" prio=5 tid=7fb9be6f5800 nid=0x1159a7000 in Object.wait()
> [1159a4000]
> java.lang.Thread.State: RUNNABLE
> at org.apache.jena.riot.RIOT.<clinit>(RIOT.java:38)
> at java.lang.Class.forName0(Native Method)
> at java.lang.Class.forName(Class.java:169)
> at com.hp.hpl.jena.rdf.model.impl.IO_Ctl.callByRefection(IO_Ctl.java:54)
> at com.hp.hpl.jena.rdf.model.impl.IO_Ctl.init(IO_Ctl.java:36)
> - locked <7f3883170> (a java.lang.Object)
> at com.hp.hpl.jena.rdf.model.impl.ModelCom.<clinit>(ModelCom.java:65)
> at
> com.hp.hpl.jena.rdf.model.ModelFactory.createDefaultModel(ModelFactory.java:140)
> at xx.FirstJenaTest.test(FirstJenaTest.java:xx)
> 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:45)
> at
> org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
> at
> org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)
> at
> org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
> at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)
> at
> org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68)
> at
> org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47)
> at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
> at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
> at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)
> at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
> at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
> at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
> at
> org.apache.maven.surefire.junitcore.ClassDemarcatingRunner.run(ClassDemarcatingRunner.java:58)
> at org.junit.runners.Suite.runChild(Suite.java:128)
> at org.junit.runners.Suite.runChild(Suite.java:24)
> at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
> at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:439)
> at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
> at java.util.concurrent.FutureTask.run(FutureTask.java:138)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> at java.lang.Thread.run(Thread.java:680)
> "pool-1-thread-1" prio=5 tid=7fb9be0d8000 nid=0x1158a4000 in Object.wait()
> [1158a1000]
> java.lang.Thread.State: RUNNABLE
> at
> com.hp.hpl.jena.rdf.model.ModelFactory.createDefaultModel(ModelFactory.java:140)
> at com.hp.hpl.jena.vocabulary.OWL.<clinit>(OWL.java:36)
> at com.hp.hpl.jena.sparql.ARQConstants.<clinit>(ARQConstants.java:44)
> at com.hp.hpl.jena.query.ARQ.<clinit>(ARQ.java:70)
> at com.hp.hpl.jena.query.Query.<clinit>(Query.java:63)
> at xx.SecondJenaTest.test(SecondJenaTest.java:xx)
> 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:45)
> at
> org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
> at
> org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)
> 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:30)
> at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)
> at
> org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68)
> at
> org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47)
> at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
> at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
> at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)
> at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
> at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
> at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
> at
> org.apache.maven.surefire.junitcore.ClassDemarcatingRunner.run(ClassDemarcatingRunner.java:58)
> at org.junit.runners.Suite.runChild(Suite.java:128)
> at org.junit.runners.Suite.runChild(Suite.java:24)
> at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
> at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:439)
> at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
> at java.util.concurrent.FutureTask.run(FutureTask.java:138)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> at java.lang.Thread.run(Thread.java:680)
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