Thanks to your responses I'm some steps further now ;-)

I had to split the actual feature and the resources (icons, db, some extra 
configuration files) into two separate kar/feature files because otherwise all 
features contained in the original kar file with the resources was added as 
startup features in the startup.properties which was not desired.

4 out of 5 times I get a very generic "Unable to build assembly: Error"

Failed to execute goal 
org.apache.karaf.tooling:karaf-maven-plugin:4.0.5:assembly (default-assembly) 
on project asse
mbly: Unable to build assembly: Error -> [Help 1]
org.apache.karaf.features.internal.util.MultiException: Error
        at 
org.apache.karaf.features.internal.download.impl.MavenDownloadManager$MavenDownloader.<init>(MavenDownloa
dManager.java:84) ~[?:?]
        at 
org.apache.karaf.features.internal.download.impl.MavenDownloadManager.createDownloader(MavenDownloadManag
er.java:72) ~[?:?]
        at 
org.apache.karaf.profile.assembly.Builder.bootStage(Builder.java:807) ~[?:?]
        at 
org.apache.karaf.profile.assembly.Builder.doGenerateAssembly(Builder.java:611) 
~[?:?]
        at 
org.apache.karaf.profile.assembly.Builder.generateAssembly(Builder.java:389) 
~[?:?]
        at 
org.apache.karaf.tooling.AssemblyMojo.doExecute(AssemblyMojo.java:392) ~[?:?]
        at org.apache.karaf.tooling.AssemblyMojo.execute(AssemblyMojo.java:228) 
~[?:?]
        at 
org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)
 ~[maven
-core-3.3.9.jar:3.3.9]
        at 
org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:207) 
~[maven-core-3.3.9.jar:3.
3.9]
        ... 20 more
Wrapped by: org.apache.maven.plugin.MojoExecutionException: Unable to build 
assembly
        at org.apache.karaf.tooling.AssemblyMojo.execute(AssemblyMojo.java:234) 
~[?:?]
        at 
org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)
 ~[maven
-core-3.3.9.jar:3.3.9]
        at 
org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:207) 
~[maven-core-3.3.9.jar:3.
3.9]
        ... 20 more
Wrapped by: org.apache.maven.lifecycle.LifecycleExecutionException: Failed to 
execute goal org.apache.karaf.tooling:
karaf-maven-plugin:4.0.5:assembly (default-assembly) on project assembly: 
Unable to build assembly
        at 
org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:212) 
~[maven-core-3.3.9.jar:3.
3.9]
        at 
org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153) 
~[maven-core-3.3.9.jar:3.
3.9]
        at 
org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145) 
~[maven-core-3.3.9.jar:3.
3.9]
        at 
org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:116)
~[maven-core-3.3.9.jar:3.3.9]
        at 
org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:80)
 ~
[maven-core-3.3.9.jar:3.3.9]
        at 
org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuil
der.java:51) ~[maven-core-3.3.9.jar:3.3.9]
        at 
org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128)
 ~[maven-core-3.3.
9.jar:3.3.9]
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:307) 
~[maven-core-3.3.9.jar:3.3.9]
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:193) 
~[maven-core-3.3.9.jar:3.3.9]
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:106) 
~[maven-core-3.3.9.jar:3.3.9]
        at org.apache.maven.cli.MavenCli.execute(MavenCli.java:863) 
[maven-embedder-3.3.9.jar:3.3.9]
        at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:288) 
[maven-embedder-3.3.9.jar:3.3.9]
        at org.apache.maven.cli.MavenCli.main(MavenCli.java:199) 
[maven-embedder-3.3.9.jar:3.3.9]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
~[?:1.7.0_79]
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) 
~[?:1.7.0_79]
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
 ~[?:1.7.0_79]
        at java.lang.reflect.Method.invoke(Method.java:606) ~[?:1.7.0_79]
        at 
org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)
 [plexus-classworlds-2
.5.2.jar:?]
        at 
org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229) 
[plexus-classworlds-2.5.2.jar
:?]
        at 
org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
 [plexus-classworlds
-2.5.2.jar:?]
        at 
org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356) 
[plexus-classworlds-2.5.2.jar:?
]
 org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal 
org.apache.karaf.tooling:karaf-maven
-plugin:4.0.5:assembly (default-assembly) on project assembly: Unable to build 
assembly
        at 
org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:212) 
~[maven-core-3.3.9.jar:3.
3.9]
        at 
org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153) 
~[maven-core-3.3.9.jar:3.
3.9]
        at 
org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145) 
~[maven-core-3.3.9.jar:3.
3.9]
        at 
org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:116)
~[maven-core-3.3.9.jar:3.3.9]
        at 
org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:80)
 ~
[maven-core-3.3.9.jar:3.3.9]
        at 
org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuil
der.java:51) ~[maven-core-3.3.9.jar:3.3.9]
        at 
org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128)
 ~[maven-core-3.3.
9.jar:3.3.9]
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:307) 
~[maven-core-3.3.9.jar:3.3.9]
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:193) 
~[maven-core-3.3.9.jar:3.3.9]
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:106) 
~[maven-core-3.3.9.jar:3.3.9]
        at org.apache.maven.cli.MavenCli.execute(MavenCli.java:863) 
[maven-embedder-3.3.9.jar:3.3.9]
        at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:288) 
[maven-embedder-3.3.9.jar:3.3.9]
        at org.apache.maven.cli.MavenCli.main(MavenCli.java:199) 
[maven-embedder-3.3.9.jar:3.3.9]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
~[?:1.7.0_79]
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) 
~[?:1.7.0_79]
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
 ~[?:1.7.0_79]
        at java.lang.reflect.Method.invoke(Method.java:606) ~[?:1.7.0_79]
        at 
org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)
 [plexus-classworlds-2
.5.2.jar:?]
        at 
org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229) 
[plexus-classworlds-2.5.2.jar
:?]
        at 
org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
 [plexus-classworlds
-2.5.2.jar:?]
        at 
org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356) 
[plexus-classworlds-2.5.2.jar:?
]
Caused by: org.apache.maven.plugin.MojoExecutionException: Unable to build 
assembly
        at org.apache.karaf.tooling.AssemblyMojo.execute(AssemblyMojo.java:234) 
~[?:?]
        at 
org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)
 ~[maven
-core-3.3.9.jar:3.3.9]
        at 
org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:207) 
~[maven-core-3.3.9.jar:3.
3.9]
        ... 20 more
Caused by: org.apache.karaf.features.internal.util.MultiException: Error
        at 
org.apache.karaf.features.internal.download.impl.MavenDownloadManager$MavenDownloader.<init>(MavenDownloa
dManager.java:84) ~[?:?]
        at 
org.apache.karaf.features.internal.download.impl.MavenDownloadManager.createDownloader(MavenDownloadManag
er.java:72) ~[?:?]
        at 
org.apache.karaf.profile.assembly.Builder.bootStage(Builder.java:807) ~[?:?]
        at 
org.apache.karaf.profile.assembly.Builder.doGenerateAssembly(Builder.java:611) 
~[?:?]
        at 
org.apache.karaf.profile.assembly.Builder.generateAssembly(Builder.java:389) 
~[?:?]
        at 
org.apache.karaf.tooling.AssemblyMojo.doExecute(AssemblyMojo.java:392) ~[?:?]
        at org.apache.karaf.tooling.AssemblyMojo.execute(AssemblyMojo.java:228) 
~[?:?]
        at 
org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)
 ~[maven
-core-3.3.9.jar:3.3.9]
        at 
org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:207) 
~[maven-core-3.3.9.jar:3.
3.9]
        ... 20 more


Any ides on that?

Best,
Lukas

-----Ursprüngliche Nachricht-----
Von: James Carman [mailto:ja...@carmanconsulting.com] 
Gesendet: Montag, 20. Juni 2016 13:01
An: dev@karaf.apache.org
Betreff: Re: Karaf 4.0.x Custom distribution

Here is our custom Karaf build against 4.0.x and it is working. I know we faced 
some issues also, but they are resolved now. I do not remember the details.

https://github.com/savoirtech/aetos/tree/4.0.x?files=1
On Mon, Jun 20, 2016 at 6:48 AM Roedl Lukas <lukas.ro...@ait.ac.at> wrote:

> Hi!
>
> I'm currently trying to upgrade our custom distribution to the Karaf 4 
> way of doing things.
> Unfortunately I'm experiencing some problems when compiling the 
> assembly when the karaf-maven-plugin tries to "Resolving features". 
> The errors look like the following:
>
> Failed to execute goal
> org.apache.karaf.tooling:karaf-maven-plugin:4.0.5:assembly
> (default-assembly) on project asse
> mbly: Unable to build assembly: Unable to resolve root: missing 
> requirement [root] osgi.identity; osgi.identity=home r-core-minimal; 
> type=karaf.feature; version=1.2.31.SNAPSHOT; 
> filter:="(&(osgi.identity=homer-core-minimal)(type=kara
> f.feature)(version>=1.2.31.SNAPSHOT))" [caused by: Unable to resolve
> homer-core-minimal/1.2.31.SNAPSHOT: missing req uirement 
> [homer-core-minimal/1.2.31.SNAPSHOT] osgi.identity; 
> osgi.identity=aries-blueprint; type=karaf.feature] -> [ Help 1]
>
> It seems to be caused by my features linking to features out of the 
> Karaf "standard" or "enterprise" features set. It's not only affecting 
> "aries-blueprint" but also "log" or "eventadmin".
> I setup a little test-project under [1] with the features file [2] and 
> further maven configuration to reproduce the errors.
>
> Did anyone also experience such errors and knows how to solve them?
> Can I overcome this issue using the "prerequisite" or "dependency"
> attribute for the linked feature?
> Is it ok to link against Karaf features or can/must I assume that the 
> framework is properly configured beforehand?
>
> Thanks in advance,
> Lukas
>
> [1] https://github.com/roedll/homer-karaf4-assembly-test
> [2]
> https://github.com/roedll/homer-karaf4-assembly-test/blob/master/featu
> re/src/main/feature/feature.xml
>

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