[jira] [Commented] (FELIX-5316) Updating from SCR 2.0.2 to SCR 2.0.4 leads to nullpointers

["James Watkins-Harvey (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FELIX-5316?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15404393#comment-15404393 ] 

James Watkins-Harvey commented on FELIX-5316:
---------------------------------------------

The bug has been introduced in r1744739 (FELIX-5243).

Here are the key items of the stack trace:

{noformat}
java.lang.NullPointerException
	at org.osgi.util.tracker.ServiceTracker.<init>(ServiceTracker.java:184)
	at org.apache.felix.scr.impl.inject.ClassUtils.getPackageAdmin(ClassUtils.java:187)
	at org.apache.felix.scr.impl.inject.ClassUtils.getClassFromComponentClassLoader(ClassUtils.java:118)
        [...]
	at org.apache.felix.scr.impl.Activator.start(Activator.java:108)
        [...]
{noformat}

From the first three lines, we get that the static field {{ClassUtils.m_context}} is {{null}}. The value of that field is set in {{Activator.start()}}, at line 110. But the method is called a little bit too early: we are currently at line 108 of that very same method.

It should be possible to fix the bug by simply moving lines 109-110 of Activator.jave before the current line 108.

> Updating from SCR 2.0.2 to SCR 2.0.4 leads to nullpointers
> ----------------------------------------------------------
>
>                 Key: FELIX-5316
>                 URL: https://issues.apache.org/jira/browse/FELIX-5316
>             Project: Felix
>          Issue Type: Bug
>          Components: Declarative Services (SCR)
>    Affects Versions: scr-2.0.4
>         Environment: org.apache.felix.main 5.4.0
> org.apache.felix.scr 2.0.4
>            Reporter: max urech
>         Attachments: felixScrNullpointer.txt
>
>
> Our Application works fine with org.apache.felix.scr 2.0.2.
> If we update to org.apache.felix.scr 2.0.4 it doesn't work any more.
> Several bundles fail to load their components. 
> The failure is displayed as stack trace([^felixScrNullpointer.txt]) on the console.
> The failing components all have the same pattern in their definitions. 
> They all provide the same interface and are defined as immediate=true. 
> There is another component, which defines a dynamic 0..n reference to this interface.
> I suspect, there has been introduced a bug with issue FELIX-4417.



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