<buildCommand>
<name>org.eclipse.pde.ManifestBuilder</name>
<arguments>
</arguments>
</buildCommand>
<buildCommand>
<name>org.eclipse.pde.SchemaBuilder</name>
<arguments>
</arguments>
</buildCommand>
...
<nature>org.eclipse.pde.PluginNature</nature>
I restarted eclipse. This didn't help with being able to export my project as a Deployable plug-in. The project was still not available for selection. However, since I did this I've been able to open the server from the servers view without Eclipse crashing.