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A client of mine had sever problems trying to aggregate the update/e3.4 repository. After some debugging deep down in p2 code, I found the cause. The p2 metadata contains this entry: <property name='p2.mirrorsURL' value='http://www.eclipse.org/downloads/download.php?file=/tools/mylyn/update/e3.4/categories.xml&protocol=http&format=xml'/> The '/categories.xml' part of that URL is incorrect and should be removed. It completely invalidates all mirroring. p2 tries its best to find artifacts like <some mirror>/tools/mylyn/update/e3.4/categories.xml/plugins/org.eclipse.mylyn.tasks.search_3.4.0.v20100608-0100-e3x.jar but fails every time. It takes quite some time for p2 to figure out that all mirrors are invalid.
Args. Sorry about that. I have fixed the mirror URL and re-generated the meta-data. Please let me know if you are still seeing this.