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For uploading a plugin with multiple nbms, the files need to be placed inside a vanilla zip file. While the nbm files are all built with a single click this last step requires a manual hack. Confusingly, there is a menu option Build Zip distribution which has nothing to do with this. This menu option should either be replaced with a "Build plugin Zip" option or should provide this functionality in this case. Please also see discussion at http://www.nabble.com/Uploading-a-plugin-with-multiple-nbms-to16993194.html#a17024953
Could perhaps append to apisupport.harness/release/suite.xml#nbms e.g.: <zip zipfile="build/updates.zip"> <fileset dir="${build.updates.dir}"/> </zip> Not sure if the presence of the updates.xml file would be a problem for the plugin portal; if so, could add excludes="updates.xml".
*** Issue 152131 has been marked as a duplicate of this issue. ***
Why not change the upload UI to accept multiple NBMs to begin with? I am not going to complicate build infrastructure (and product UI) because of need to invoke <zip/> Ant target - an FAQ can handle that. For both stated reasons marking won'tfix.