[KARAF-4251] karaf-maven-plugin register its own URLStreamHandlerFactory for mvn

• Type: Question
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 3.0.5
• Component/s: karaf
• Assignee: Unassigned
• Reporter: Alexander Osterwald
• Created: 06/Jan/16 13:07
• Updated: 16/Sep/18 04:35

Description

The karaf-maven-plugin registers its own URLStreamHandlerFactory for the protocol mvn see here.

InstallKarsMojo.java

static {
        URL.setURLStreamHandlerFactory(new URLStreamHandlerFactory() {
            public URLStreamHandler createURLStreamHandler(String protocol) {
                if ("wrap".equals(protocol)) {
                    return new org.ops4j.pax.url.wrap.Handler();
                }
                if ("mvn".equals(protocol)) {
                    return new org.ops4j.pax.url.mvn.Handler();
                }
                return null;
            }
        });
    }

1. Why is this necessary?
2. Why not using the system property java.protocol.handler.pkgs?

I tried to set the URLStreamHandlerFactory in a project where I use the karaf-maven-plugin which leads to the exception 'factory already set....'
3. Is it possible to implement a check whether the protocol mvn is already?

Issue Links

• relates to: KARAF-3611 karaf-maven-plugin fails for startupFeatures + "wrap:"