[FELIX-3836] NPE when calling InstanceDescription.getDescription() ; // HandlerDescription is missing for org.apache.felix.ipojo.handlers.event:subscriber handler

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: ipojo-runtime-1.12.1
• Component/s: iPOJO
• Assignee: Clement Escoffier
• Reporter: Jérémy Cazaux
• Created: 01/Jan/13 17:21
• Updated: 24/Dec/14 16:23
• Resolved: 10/Dec/14 07:44

Description

java.lang.NullPointerException
at org.apache.felix.ipojo.architecture.InstanceDescription.getDescription(InstanceDescription.java:164)
at org.apache.felix.ipojo.PrimitiveInstanceDescription.getDescription(PrimitiveInstanceDescription.java:165)

NPE when executing this line in the InstanceDescription : instance.addElement(m_handlers[i].getHandlerInfo()); 

My component has 4 handlers : [org.ow2.jonas.ipojo.interceptor:interceptor, org.apache.felix.ipojo:provides, org.apache.felix.ipojo.handlers.event:subscriber, org.apache.felix.ipojo:architecture]

cazauxj@jonas$ inspect service capability 103
JOnAS :: Services :: JOnAS report :: Extensions :: Deployables (103) provides services:
---------------------------------------------------------------------------------------
component.class = org.ow2.jonas.report.extensions.deployables.internal.DeployablesReportExtension
component.description = factory name="DeployablesReportExtension" bundle="103" state="valid" implementation-class="org.ow2.jonas.report.extensions.deployables.internal.DeployablesReportExtension"
requiredhandlers list="[org.ow2.jonas.ipojo.interceptor:interceptor, org.apache.felix.ipojo:provides, org.apache.felix.ipojo.handlers.event:subscriber, org.apache.felix.ipojo:architecture]"
missinghandlers list="[]"
provides specification="org.ow2.jonas.report.api.IReportExtension"
property name="namespace" type="java.lang.String" value="http://jonas.ow2.org/report/deployables/1.0"
property name="event.topics" type="java.util.Dictionary" value="{}"
property name="event.filter" type="java.util.Dictionary" value="{}"
inherited interfaces="[org.ow2.jonas.report.api.IReportExtension]" superclasses="[]"
component.properties = [Lorg.apache.felix.ipojo.architecture.PropertyDescription;@19c59085
component.providedServiceSpecifications = org.ow2.jonas.report.api.IReportExtension
factory.name = DeployablesReportExtension
factory.state = 1
objectClass = org.apache.felix.ipojo.Factory, org.osgi.service.cm.ManagedServiceFactory
service.id = 299
service.pid = DeployablesReportExtension

---

factory.name = DeployablesReportExtension
instance.name = DeployablesReportExtension-0
namespace = http://jonas.ow2.org/report/deployables/1.0
objectClass = org.ow2.jonas.report.api.IReportExtension
service.id = 303

When debugging, it looks like that the array of HandlerDescription does contain the correct number of element (4) but the element with index 2 is NULL. So the HandlerDescription is missing for org.apache.felix.ipojo.handlers.event:subscriber handler. However, all HandlerManager are available from the InstanceManager (the HandlerManager associated to the subscriber handler is not null). I have attached a picture to illustrate this.