Hi all,I have some questions regarding on unbind method in service reference
listener. Given that I have a service reference bean (which is optional) and
there is a listener with bind/unbind method
<reference id=”serviceReference” interface=”my.serviceInterface”
availability=”optional”>
<reference-listener
bind-method=”bind” unbind-method=”unbind”>
<bean class=“my.referenceListener”/>
</reference-listener>
</reference-list>and this is the unbind methodpublic void unbind(ServiceType
service, Map properties){
service.unregister(something); //hit NPE intermittently during start up
}During Felix container start up, it will hit Null Pointer Exception
intermittently (not all the time during start up) and it was thrown from the
unbind method. From the debug mode, it will go into unbind(null, null)in the
AbstractServiceReferenceRecipe#updateListeners (I am using aries.blueprint.core
V1.1.0)
protected void updateListeners() { if (references.isEmpty()) { unbind(null,
null); //(ServiceReference, Service) } else { retrack(); }}
If I not mistaken, in Spring DM, the unbind method will only be called if
current backing service is unregistered, and no replacement service is
immediately available, i.e.: previously there is something bind to it before it
goes to unbind (Please correct me if I am wrong). Is this not the case for
Aries blueprint? as in based on the code, there is possibility to unbind(null,
null)? May I know under what circumstances this unbind(null, null) could happen?
Thank you.
