Gora doesn't properly import into eclipse. The problem is that there was a regression in the Tycho configurator plugin that causes the plugin to crash when extraneous manifest manipulation is performed. The issue (along with some other conflated but unrelated issues) is discussed here: https://github.com/sonatype/m2eclipse-tycho/issues/4
Simply configuring Felix and setting the artifact type to bundle should accomplish everything that is being done, so the extra Felix execution and the jar plugin executions can be removed.
Additionally, there are maven plugins that generate m2e warnings that can be safely ignored and a source version configuration problem.