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https://issues.apache.org/jira/browse/FELIX-4171?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13803355#comment-13803355
 ] 

David Jencks commented on FELIX-4171:
-------------------------------------

Typical stack trace from a moderately recent build is

Caused by: java.lang.NullPointerException
    at 
org.apache.felix.scr.impl.manager.DependencyManager.invokeUnbindMethod(DependencyManager.java:1727)
    at 
org.apache.felix.scr.impl.manager.DependencyManager.close(DependencyManager.java:1487)
    at 
org.apache.felix.scr.impl.manager.ImmediateComponentManager.createImplementationObject(ImmediateComponentManager.java:290)
    at 
org.apache.felix.scr.impl.manager.ImmediateComponentManager.createComponent(ImmediateComponentManager.java:127)
    at 
org.apache.felix.scr.impl.manager.ImmediateComponentManager.getService(ImmediateComponentManager.java:855)
    at 
org.apache.felix.scr.impl.manager.ImmediateComponentManager.getServiceInternal(ImmediateComponentManager.java:822)
    at 
org.apache.felix.scr.impl.manager.ImmediateComponentManager.getService(ImmediateComponentManager.java:761)


> [DS] possible DependencyManager NPE during cleanup after failure to activate 
> a component
> ----------------------------------------------------------------------------------------
>
>                 Key: FELIX-4171
>                 URL: https://issues.apache.org/jira/browse/FELIX-4171
>             Project: Felix
>          Issue Type: Bug
>          Components: Declarative Services (SCR)
>    Affects Versions: scr-1.8.0
>            Reporter: David Jencks
>            Assignee: David Jencks
>             Fix For: scr-1.8.0
>
>
> Thanks to Adam Purkiss for finding and reporting this problem.
> If a component has more than one dependency, and a non-last dependency cannot 
> actually be obtained during activation, we'll try to close the non-opened 
> dependency managers: their EdgeInfo wont have the openLatch set (they aren't 
> open) and the attempt to use the latch during close will cause an NPE.



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