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I'm seeing "Badly formed Maven project" in place of the project names in the "Projects tab". But the involved project works with Maven, both inside NetBeans and from the command line. Even though it turns out that there's something missing in the pom, this should be just a warning and not prevent me from seeing the project name. You can easily reproduce it by checking out: svn co -r 283 https://jrawio.dev.java.net/svn/jrawio/trunk/src (it's a 50M project). The tooltip says: "Missing extensions or plugin with extension."
The problem disappeared after scratching the local Maven repo, and relaunching a build. I've updated the Wiki at http://wiki.netbeans.org/MavenBadlyFormedProjectErrors I suggest that whenever a "Badly formed..." appears in NetBeans, the user is pointed to that Wiki page, so he can find more information.
let's track this as duplicate of #169307, the wiki page already *is* shown in the "show problems" dialog. Not sure what can be done more. *** This issue has been marked as a duplicate of 169307 ***