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https://issues.apache.org/jira/browse/SLING-7218?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16226783#comment-16226783
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Konrad Windszus commented on SLING-7218:
----------------------------------------
This is correct. According to DS 1.3 an array property which is not set
defaults to null (irrespective of the configuration property fields default
value which is only evaluated at build time). This is also described in
https://osgi.org/bugzilla/show_bug.cgi?id=208. I would suggest to accept
{{null}} here.
> NPE in org.apache.sling.security.impl.ContentDispositionFilter#activate
> -----------------------------------------------------------------------
>
> Key: SLING-7218
> URL: https://issues.apache.org/jira/browse/SLING-7218
> Project: Sling
> Issue Type: Bug
> Components: Extensions
> Reporter: Antonio Sanso
> Assignee: Antonio Sanso
>
> {noformat}
> 09.10.2017 07:05:55.216 *ERROR* [FelixStartLevel] org.apache.sling.security
> [org.apache.sling.security.impl.ContentDispositionFilter(96)] The activate
> method has thrown an exception (java.lang.NullPointerException)
> java.lang.NullPointerException: null
> at java.util.Objects.requireNonNull(Objects.java:203)
> at java.util.Arrays$ArrayList.<init>(Arrays.java:3813)
> at java.util.Arrays.asList(Arrays.java:3800)
> 09.10.2017 07:05:55.219 *ERROR* [FelixDispatchQueue] org.apache.sling.engine
> FrameworkEvent ERROR (org.osgi.framework.ServiceException: Service factory
> returned null. (Component:
> org.apache.sling.security.impl.ContentDispositionFilter (96)))
> org.osgi.framework.ServiceException: Service factory returned null.
> (Component: org.apache.sling.security.impl.ContentDispositionFilter (96))
> at
> org.apache.felix.framework.ServiceRegistrationImpl.getFactoryUnchecked(ServiceRegistrationImpl.java:380)
> at
> org.apache.felix.framework.ServiceRegistrationImpl.getService(ServiceRegistrationImpl.java:247)
> at
> org.apache.felix.framework.ServiceRegistry.getService(ServiceRegistry.java:350)
> {noformat}
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