Tobias Stoeckmann created OWB-1013:
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Summary: Race condition in Instance injection
Key: OWB-1013
URL: https://issues.apache.org/jira/browse/OWB-1013
Project: OpenWebBeans
Issue Type: Bug
Components: Injection and Lookup
Affects Versions: 1.2.6
Reporter: Tobias Stoeckmann
OpenWebBeans is prone to flip instances of javax.enterprise.inject.Instance in
multi-threaded environments.
It is possible for multiple threads to access InstanceProducer at the same time
with the same creational context. If that happens, it is not verified that
these threads get the correct injectionPoint out of the injectionPoints stack
in the shared CreationalContextImpl.
Please see attached example source (with comments included). It'll require a
debugger because it's quite tricky to get the threads into proper timing. Start
main method of class de.cewe.race.Main. It constructs a simple SE container and
executes two threads which will trigger the issue.
Set breakpoints at:
- de.cewe.race.CDIMain, line 46 (System.out.println)
- org.apache.webbeans.portable.InstanceProducer, line 65 (getInjectionPoint)
Wait until threads "RunnableA" and "RunnableB" reached the second breakpoint.
Then let RunnableA finish. It will trigger a ClassCastException. For your own
convenience, activate the second breakpoint after first one is reached. It
reduces debugger noise during startup.
Sep 26, 2014 10:36:53 AM org.apache.webbeans.lifecycle.AbstractLifeCycle
bootstrapApplication
INFORMATION: OpenWebBeans Container is starting...
Sep 26, 2014 10:36:53 AM
org.apache.webbeans.corespi.scanner.AbstractMetaDataDiscovery
addWebBeansXmlLocation
INFORMATION: added beans.xml marker:
file:/C:/Users/Stoeckmann/workspace/instance-race/target/classes/META-INF/beans.xml
Sep 26, 2014 10:36:53 AM org.apache.webbeans.config.BeansDeployer
validateInjectionPoints
INFORMATION: All injection points were validated successfully.
Sep 26, 2014 10:36:53 AM org.apache.webbeans.lifecycle.AbstractLifeCycle
bootstrapApplication
INFORMATION: OpenWebBeans Container has started, it took [213] ms.
don't forget to activate your breakpoint!
Master A: de.cewe.race.a.MasterA@53aaed7
Exception in thread "RunnableA" java.lang.ClassCastException:
de.cewe.race.b.SlaveB cannot be cast to de.cewe.race.a.SlaveA
at de.cewe.race.a.MasterA.access(MasterA.java:11)
at de.cewe.race.a.RunnableA.run(RunnableA.java:13)
at java.lang.Thread.run(Thread.java:745)
Master B: de.cewe.race.b.MasterB@662546db
Exception in thread "RunnableB" java.lang.ClassCastException:
de.cewe.race.a.MasterA cannot be cast to de.cewe.race.b.SlaveB
at de.cewe.race.b.MasterB.access(MasterB.java:11)
at de.cewe.race.b.RunnableB.run(RunnableB.java:13)
at java.lang.Thread.run(Thread.java:745)
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