Stephen Owens created JENA-400:
----------------------------------
Summary: 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
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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