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The org.eclipse.e4.rcp.feature (nor any others that I can determine) does not include org.eclipse.equinox.concurrent. As a result, products exported from E4 do not contain this element and will not run. This result can be seen by exporting and attempting to run: http://dev.eclipse.org/viewcvs/index.cgi/e4/org.eclipse.e4.deeplink/examples/org.eclipse.e4.ui.deeplink.example.client.product/
Just to clarify, the purpose of the org.eclipse.e4.rcp feature was to gather together all the e4 plugins required by the org.eclipse.rcp 4.0 feature. It wasn't intended to be comprehensive - it doesn't contain any of the required plugins from equinox or original platform that it needs to be able to run. I suggest using the org.eclipse.rcp v4.0 feature, which transitively includes all dependencies it requires.
Even including org.eclipse.rcp version 4.2 does not provide org.eclipse.equinox.concurrent though
You have to include it yourself if you want to use it. It is not in any feature. See https://bugs.eclipse.org/bugs/show_bug.cgi?id=309247