Description Holger Schill 2009-12-29 05:54:12 EST

Xtext goes through all resources in ResourceSet and tries to get the IResourceDescription for every URI. If the URI describes a non Xtext-resource the result of 

IResourceServiceProvider resourceServiceProvider = registry.getResourceServiceProvider(uri, null); in the class org.eclipse.xtext.resource.impl.ResourceSetBasedResourceDescriptions leads to null. So if the next step is 

Manager manager = resourceServiceProvider.getResourceDescriptionManager();

we have a NullPointerException.

In my opinion the builder should not care about non Xtext resources.

The org.eclipse.xtext.builder.impl.javasupport.JdtToBeBuiltComputer should filter out such resources.