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There's a strange problem in the gradle build configurations generated by the Xtext project wizard: if you give your project a name that starts with org.eclipse.xtext... the gradle build fails when it comes to the .ide project with this error: :org.eclipse.xtext.example.mydsl:processResources :org.eclipse.xtext.example.mydsl:classes :org.eclipse.xtext.example.mydsl:jar :org.eclipse.xtext.example.mydsl.ide:generateXtext FAILURE: Build failed with an exception. * What went wrong: Could not resolve all dependencies for configuration 'detachedConfiguration2'. > Could not find org.eclipse.xtend:org.eclipse.xtend.core:1.0.0-SNAPSHOT. Searched in the following locations: https://jcenter.bintray.com/org/eclipse/xtend/org.eclipse.xtend.core/1.0.0-SNAPSHOT/maven-metadata.xml https://jcenter.bintray.com/org/eclipse/xtend/org.eclipse.xtend.core/1.0.0-SNAPSHOT/org.eclipse.xtend.core-1.0.0-SNAPSHOT.pom https://jcenter.bintray.com/org/eclipse/xtend/org.eclipse.xtend.core/1.0.0-SNAPSHOT/org.eclipse.xtend.core-1.0.0-SNAPSHOT.jar Required by: org.eclipse.xtext.example.mydsl:org.eclipse.xtext.example.mydsl.ide:1.0.0-SNAPSHOT it really looks like it tries to resolve the xtend.core dependency using the same version of the project (1.0.0-SNAPSHOT). This never happens if you give your project a name that does NOT start with org.eclipse.xtext, e.g., org.xtext is fine. This happens both with Xtext 2.9.2 and Xtext 2.10 nightly, and it was tested in Linux and Mac.
Indeed, the xtext-gradle plugin does not like it when there is something called org.eclipse.xtext.* that in fact is not Xtext :) We could make the matching more strict (only matching certain well-known Xtext jars). If you're interested in contributing, the relevant line is here: https://github.com/xtext/xtext-gradle-plugin/blob/master/xtext-gradle-plugin/src/main/java/org/xtext/gradle/tasks/XtextExtension.xtend#L44
