better error message when assets.conf is missing #1324

Author: jknack

modules/jooby-assets/src/main/java/org/jooby/assets/Assets.java

@@ -219,6 +219,8 @@
 import org.slf4j.LoggerFactory;
 
 import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.IOException;
 import java.nio.file.Path;
 import java.nio.file.Paths;
 import java.util.List;
@@ -568,10 +570,10 @@ public void configure(final Env env, final Config config, final Binder binder) t
     return ConfigFactory.parseResources(getClass(), "assets.conf");
   }
 
-  private Config conf(final boolean dev, final ClassLoader loader, final Config conf) {
-    final Config[] confs;
+  private Config conf(final boolean dev, final ClassLoader loader, final Config conf) throws
+      IOException {
     if (!dev) {
-      confs = new Config[]{
+      Config[] confs = {
           ConfigFactory.parseResources(loader,
               "assets." + conf.getString("application.env").toLowerCase() + ".conf"),
           ConfigFactory.parseResources(loader, "assets.dist.conf"),
@@ -582,6 +584,9 @@ private Config conf(final boolean dev, final ClassLoader loader, final Config co
         }
       }
     }
+    if (loader.getResource("assets.conf") == null) {
+      throw new FileNotFoundException("assets.conf");
+    }
     return ConfigFactory.parseResources(loader, "assets.conf").withFallback(conf).resolve();
   }