It seems to work after I used a version range that allows exactly one
spring verion only.
<feature name="my-spring" version="${project.version}">
<feature version="[${spring.version},${spring.version}]">spring</feature>
<feature
version="[${spring.version},${spring.version}]">spring-web</feature>
<feature version="[${spring.version},${spring.version}]">spring-tx</feature>
<feature
version="[${spring.version},${spring.version}]">spring-websocket</feature>
<bundle
dependency="true">mvn:org.apache.servicemix.bundles/org.apache.servicemix.bundles.spring-messaging/${spring.version}</bundle>
</feature>
