[jbossseam-issues] [JBoss JIRA] Created: (JBSEAM-3295) Major reentrancy problem with "Application Scope" components and injection/disinjection
Denis Forveille (JIRA)
jira-events at lists.jboss.org
Wed Aug 20 17:03:22 EDT 2008
Major reentrancy problem with "Application Scope" components and injection/disinjection
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Key: JBSEAM-3295
URL: https://jira.jboss.org/jira/browse/JBSEAM-3295
Project: Seam
Issue Type: Bug
Components: Core
Affects Versions: 2.0.2.SP1
Environment: WebSphere v6.1.0.17 in POJO Mode
Reporter: Denis Forveille
Priority: Blocker
There is a major reentrancy problem with "Application Scope" components and injection/disinjection
As in any component @In dependent object are injected/disinjected with the BijectionInterceptor interceptor
As there is one instance of BijectionInterceptor per Component (It seems), there is only one instance of BijectionInterceptor in the JVM for an Application Scope Component, instance shared by all threads
With that in mind, take:
- 2 running thread (T1, T2)
- One application scope component (C1) with many at In attributes (All referecing Application Scope components too..)
T1 enters method M1 of C1. BijectionInterceptor inject @In depedencies of C1, and set the "reentrant" attribute of the instance of BijectionInterceptor attached to C1 to "true"
T2 enters method M1of C1. BijectionInterceptor does nothing as "reentrant" is true
T1 exits method M1 of C1. As this is thios thread (T1) that set "reentrant" initially, it performs the "disinjection" and set all the @In attribues of C1 to null
T2 then fails with NPE as all the @In attributes of C1 are set to null !!!!!
Core of the org.jboss.seam.core.BijectionInterceptor class:
private boolean reentrant; //OK, since all Seam components are single-threaded
@AroundInvoke
public Object aroundInvoke(InvocationContext invocation) throws Exception{
if (reentrant) {
return invocation.proceed();
}
else {
reentrant = true;
try {
Component component = getComponent();
boolean enforceRequired = !component.isLifecycleMethod( invocation.getMethod() );
component.inject( invocation.getTarget(), enforceRequired );
Object result = invocation.proceed();
component.outject( invocation.getTarget(), enforceRequired );
component.disinject( invocation.getTarget() );
return result;
}
finally {
reentrant = false;
}
}
}
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