Make JabRef work in eclipse

eclipse.gradle

@@ -11,17 +11,39 @@ eclipseJdt.doLast {
  f.append('encoding/<project>=UTF-8')
 }
 eclipse {
-//add libraries to module path: https://github.com/eclipse/buildship/issues/620#issuecomment-390469550
- classpath {
+ project {
+ natures 'org.eclipse.buildship.core.gradleprojectnature'
+ }
+
+ classpath {
  file {
  whenMerged {
- entries.findAll {
- it.kind == 'src' || it.kind == 'lib'
- }.each { it.entryAttributes['module'] = 'true' }
+ entries.findAll { isModule(it) }.each { //(1)
+ it.entryAttributes['module'] = 'true'
+ }
+
+ entries.findAll { isSource(it) && isTestScope(it) }.each {
+ it.entryAttributes['test'] = 'true'
+ }
+
+ entries.findAll { isLibrary(it) && isTestScope(it) }.each {
+ it.entryAttributes['test'] = 'true'
+ }
  }
  }
+
+ defaultOutputDir = file('build')
+ downloadSources = true
+ downloadJavadoc = true
  }
 }
+
+boolean isLibrary(entry) { return entry.properties.kind.equals('lib') }
+boolean isTestScope(entry) { return entry.entryAttributes.get('gradle_used_by_scope').equals('test'); }
+boolean isModule(entry) { isLibrary(entry) && !isTestScope(entry); }
+boolean isSource(entry) { return entry.properties.kind.equals('src'); }
+
+
 // add formatter and cleanup settings to Eclipse settings
 // see http://stackoverflow.com/a/27461890/873282
 
@@ -577,4 +599,4 @@ tasks.eclipse.doFirst {
  sp_cleanup.use_type_arguments=false
  '''. stripIndent())
  }
-}
+}