better error message if no main class was specified or detected

spray · Sep 5, 2015 · 1e452c5 · 1e452c5
1 parent 62466e1
commit 1e452c5
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/src/main/scala/spray/revolver/Actions.scala b/src/main/scala/spray/revolver/Actions.scala
@@ -34,7 +34,7 @@ object Actions {
     assert(!revolverState.getProcess(project).exists(_.isRunning))
 
     // fail early
-    val theMainClass = mainClass.get
+    val theMainClass = mainClass.getOrElse(sys.error("No main class detected!"))
     val color = updateStateAndGet(_.takeColor)
     val logger = new SysoutLogger(logTag, color, streams.log.ansiCodesSupported)
     colorLogger(streams.log).info("[YELLOW]Starting application %s in the background ..." format formatAppName(project.project, color))