Hello, I thought I understand how the dependency flag is working for features and bundles, but at least it seems to be different. Perhaps someone could explain me the following scenario:
Feature file: === <?xml version="1.0" encoding="UTF-8"?> <features name="saxparserfactory" xmlns="http://karaf.apache.org/xmlns/features/v1.4.0";> <feature name="saxparserfactory" version="1.0-SNAPSHOT"> <requirement>osgi.service;filter:="(objectClass=javax.xml.parsers.SAXParserFactory)";effective:=active</requirement> <feature dependency="true">jboss-xerces</feature> </feature> <feature name="jboss-xerces" description="JBoss Xerces" version="1.0-SNAPSHOT"> <details>OSGi service for 'javax.xml.parsers.SAXParserFactory'</details> <!-- Maven repository: https://repository.jboss.org/nexus/content/repositories/releases/ --> <!-- <bundle start-level="30">mvn:org.jboss.osgi.xerces/jbosgi-xerces/3.1.0.Final</bundle> --> <bundle start-level="30">https://repository.jboss.org/nexus/content/repositories/releases/org/jboss/osgi/xerces/jbosgi-xerces/3.1.0.Final/jbosgi-xerces-3.1.0.Final.jar</bundle> <capability>osgi.service;objectClass=javax.xml.parsers.SAXParserFactory</capability> <bundle dependency="true" start-level="30">mvn:org.osgi/org.osgi.util.xml/1.0.1</bundle> <bundle dependency="true" start-level="8">mvn:org.ops4j.pax.logging/pax-logging-api/1.9.1</bundle> </feature> </features> === I would expect if I install the feature "saxparserfactory" the feature jboss-xerces is installed only if the requirements are not already fulfilled. The only requirement the feature drops in should be to ensure that there is a SAXParserFactory service available. Should this be possible? Test === I used the current Karaf 4.1.0 form the second voting round. Start a clean instance: $ bin/karaf clean As expected Apache Felix is the used OSGi framework karaf@root()> bundle:list -t 0 -s 0 | grep Active 0 │ Active │ 0 │ 5.6.1 │ org.apache.felix.framework I added the feature repository file. karaf@root()> feature:repo-add file:///home/maggu2810/tmp/saxparserfactory-feature.xml Adding feature url file:///home/maggu2810/tmp/saxparserfactory-feature.xml After that let's look if there is already a SAXParserFactory present: karaf@root()> service:list javax.xml.parsers.SAXParserFactory No output, so as expected, no service found. Check what will be done if the feature is installed: karaf@root()> feature:install -t -v saxparserfactory Adding features: saxparserfactory/[1.0.0.SNAPSHOT,1.0.0.SNAPSHOT] Changes to perform: Region: root Bundles to install: https://repository.jboss.org/nexus/content/repositories/releases/org/jboss/osgi/xerces/jbosgi-xerces/3.1.0.Final/jbosgi-xerces-3.1.0.Final.jar mvn:org.osgi/org.osgi.util.xml/1.0.1 This is as I expect what should be done. Let's exit the Karaf container. karaf@root()> shutdown -f After that I used the Equinox framework $ echo 'karaf.framework=equinox' >> etc/custom.properties and started again a clean isntance. $ bin/karaf clean Ensure the feature repository is available: karaf@root()> feature:repo-add file:///home/maggu2810/tmp/saxparserfactory-feature.xml Adding feature url file:///home/maggu2810/tmp/saxparserfactory-feature.xml The Equinox OSGi framework bundle already provides a SAXParserFactory service. karaf@root()> service:list javax.xml.parsers.SAXParserFactory [javax.xml.parsers.SAXParserFactory] ------------------------------------ service.pid = 0.org.eclipse.osgi.internal.framework.XMLParsingServiceFactory service.vendor = Eclipse.org - Equinox service.id = 20 service.bundleid = 0 service.scope = bundle Provided by : OSGi System Bundle (0) Now I would expect that the installation of the saxparserfactory feature will not trigger an installation of the jboss-xerces feature, because all requirements should be already satisfied. But it looks like: karaf@root()> feature:install -t -v saxparserfactory Adding features: saxparserfactory/[1.0.0.SNAPSHOT,1.0.0.SNAPSHOT] Changes to perform: Region: root Bundles to install: https://repository.jboss.org/nexus/content/repositories/releases/org/jboss/osgi/xerces/jbosgi-xerces/3.1.0.Final/jbosgi-xerces-3.1.0.Final.jar mvn:org.osgi/org.osgi.util.xml/1.0.1 What am I doing wrong? Best regards, Markus Rathgeb
