diff -r d058edd87424 -r 706b66d8c481 launcher/http/src/main/java/org/apidesign/bck2brwsr/launcher/Bck2BrwsrLauncher.java
--- a/launcher/http/src/main/java/org/apidesign/bck2brwsr/launcher/Bck2BrwsrLauncher.java	Tue Apr 29 14:28:52 2014 +0200
+++ b/launcher/http/src/main/java/org/apidesign/bck2brwsr/launcher/Bck2BrwsrLauncher.java	Tue Apr 29 14:59:40 2014 +0200
@@ -42,13 +42,8 @@
         return CompileCP.compileJAR(jar);
     }
 
-    @Override String compileFromClassPath(URL f, Res loader) {
-        try {
-            return CompileCP.compileFromClassPath(f, loader);
-        } catch (Exception ex) {
-            ex.printStackTrace();
-            return null;
-        }
+    @Override String compileFromClassPath(URL f, Res loader) throws IOException {
+        return CompileCP.compileFromClassPath(f, loader);
     }
     
     @Override