[wildfly-dev] Accessing system properties in a subsystem

[Brian Stansberry]

I don’t see anything in the organization of boot ops that would have changed the ordering, and the add op for that system property should be executing prior to the subsystem ops. I’ll see if I can reproduce.

> On Dec 12, 2016, at 12:10 PM, Kabir Khan <kabir.khan at jboss.com> wrote:
> 
> Where are you trying to use the system property from? They should only be attempted resolved during the RUNTIME stage, not MODEL.
>> On 12 Dec 2016, at 18:00, Tom Jenkinson <tom.jenkinson at redhat.com> wrote:
>> 
>> Hi,
>> 
>> I have a subsystem that configures itself from system properties.
>> 
>> For example:
>> <system-properties>
>>  <property name="RecoveryEnvironmentBean.expiryScannerClassNames" value="com.arjuna.ats.internal.arjuna.recovery.ExpiredTransactionStatusManagerScanner com.arjuna.ats.internal.arjuna.recovery.AtomicActionExpiryScanner"/>
>> </system-properties>
>> 
>> In earlier revisions of WFLY this worked fine. However I am now seeing that the system property is not set until after my subsystem has started. I can tell this as I have breakpoints on where I process the property. I can see "MSC service thread 1-4" attempting to process the property (which is not set). I do later see messages that suggest the system property is set but at that the later point:
>> 
>> 2016-12-12 17:57:48,042 TRACE [org.jboss.as.controller.management-operation] (Controller Boot Thread) Final response for step handler org.jboss.as.server.operations.SystemPropertyAddHandler at 784c8c5f handling add in address [("system-property" => "RecoveryEnvironmentBean.expiryScannerClassNames")] is {"outcome" => "success"}
>> 2016-12-12 17:57:48,093 TRACE [org.jboss.as.controller.management-operation] (Controller Boot Thread) Final response for step handler org.jboss.as.controller.ValidateModelStepHandler at 87b4493 handling internal-model-validation in address [("system-property" => "RecoveryEnvironmentBean.expiryScannerClassNames")] is {"outcome" => "success"}
>> 
>> Does my subsystem need to depend on something to get the old behaviour of being started after system properties are processed?
>> 
>> My subsystem is the transaction one and the service is the recovery manager.
>> 
>> Thanks!
>> Tom
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> 
> 
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-- 
Brian Stansberry
Manager, Senior Principal Software Engineer
JBoss by Red Hat