This should not be necessary. Whenever there is an unknown packaging the 
DefaultLifecycleMapping.java is used which derives from 
AbstractCustomizableLifecycleMapping as well.
There is even a test explicitly written for that in 
https://github.com/tesla/m2e-core-tests/blob/2aea30eae086696da8ffce648c2eea010184b348/org.eclipse.m2e.tests/src/org/eclipse/m2e/tests/lifecycle/LifecycleMappingTest.java#L391
 
<https://github.com/tesla/m2e-core-tests/blob/2aea30eae086696da8ffce648c2eea010184b348/org.eclipse.m2e.tests/src/org/eclipse/m2e/tests/lifecycle/LifecycleMappingTest.java#L391>.
So I go ahead and remove those parts from the m2e-ui plugin.

> On 11 Oct 2016, at 01:27, Georg Henzler <slin...@ghenzler.de> wrote:
> 
> If I remember it correctly, it was needed to make the project configurator 
> work at all. Note that ContentPackageLifecycleMapping is not just empty but 
> extends AbstractCustomizableLifecycleMapping [1] and this code only becomes 
> active for content packages because of the reference chain [2]. But maybe the 
> situation has changed with current m2e versions, might be worth checking what 
> impact removing the ContentPackageLifecycleMapping has.
> 
> Regards
> Georg
> 
> [1]
> https://github.com/jvanzyl/m2e-core/blob/master/org.eclipse.m2e.core/src/org/eclipse/m2e/core/project/configurator/AbstractCustomizableLifecycleMapping.java
> 
> [2]
> packaging "content-package" -> id 
> "org.apache.sling.ide.eclipse.m2e.contentPackageLifecycleMapping" -> 
> ContentPackageLifecycleMapping that extends 
> AbstractCustomizableLifecycleMapping
> https://github.com/apache/sling/blob/trunk/tooling/ide/eclipse-m2e-ui/lifecycle-mapping-metadata.xml#L40
> https://github.com/apache/sling/blob/trunk/tooling/ide/eclipse-m2e-ui/lifecycle-mapping-metadata.xml#L41
> https://github.com/apache/sling/blob/trunk/tooling/ide/eclipse-m2e-ui/plugin.xml#L64
> https://github.com/apache/sling/blob/trunk/tooling/ide/eclipse-m2e-ui/plugin.xml#L65
> 
> 
> On 2016-10-10 15:05, Konrad Windszus wrote:
>> In
>> https://github.com/apache/sling/blob/trunk/tooling/ide/eclipse-m2e-ui/lifecycle-mapping-metadata.xml#L41
>> <https://github.com/apache/sling/blob/trunk/tooling/ide/eclipse-m2e-ui/lifecycle-mapping-metadata.xml#L41>
>> we have referenced the explicit lifecycle mapping id from
>> https://github.com/apache/sling/blob/trunk/tooling/ide/eclipse-m2e-ui/plugin.xml#L62
>> <https://github.com/apache/sling/blob/trunk/tooling/ide/eclipse-m2e-ui/plugin.xml#L62>
>> which references the class
>> https://github.com/apache/sling/blob/trunk/tooling/ide/eclipse-m2e-ui/src/org/apache/sling/ide/eclipse/m2e/internal/ContentPackageLifecycleMapping.java
>> <https://github.com/apache/sling/blob/trunk/tooling/ide/eclipse-m2e-ui/src/org/apache/sling/ide/eclipse/m2e/internal/ContentPackageLifecycleMapping.java>.
>> The latter is empty.
>> I am wondering why the lifecycle mapping extension point was ever
>> necessary because we do nothing specific in
>> ContentPackageLifecycleMapping.java
>> <https://github.com/apache/sling/blob/trunk/tooling/ide/eclipse-m2e-ui/src/org/apache/sling/ide/eclipse/m2e/internal/ContentPackageLifecycleMapping.java>
>> and m2e should be able to come up with a a default lifecycle id based
>> on the configured plugin executions.
>> If there is no good reason for that, I would rather get rid of the
>> explicit lifecycle mapping id and only configure the plugin execution
>> similar to the one for maven-bundle-plugin.
>> @Georg Henzler: Because the original source code was contributed by
>> you in https://issues.apache.org/jira/browse/SLING-3100
>> <https://issues.apache.org/jira/browse/SLING-3100> maybe you can share
>> your thoughts.
>> Thanks,
>> Konrad

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