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The MavenDiscoveryService leaves files in the temporary directory. Adding a call to dispose the catalog does not fix the problem (nor does adding a deleteOnExit()). The UI does clean up successfully when it closes.
Fixed: http://git.eclipse.org/c/m2e/m2e-core.git/commit/?id=73850d334ff170b66585c3152c07284f9643e069
Moved to https://github.com/eclipse-m2e/m2e-core/issues/