Update site to use to get the files is:
https://raw.github.com/trajano/jaxws-maven-connector/master/jaxws-connector-update-site/

It is recommended that instead of using this M2E connector to use the M2E
enabled version of the jaxws-maven-plugin.  http://site.trajano.net/jaxws-maven-plugin/

The dependency can be added at:

    <dependency>
        <groupId>net.trajano.mojo</groupId>
        <artifactId>jaxws-maven-plugin</artifactId>
        <version>2.3.1</version>
    </dependency>