FIX YAML Loader throw ex on missing key

src/main/java/de/nclazz/resources/loader/YamlResourceManagerLoader.java

@@ -14,20 +14,22 @@ import static java.util.stream.Collectors.toSet;
 
 public class YamlResourceManagerLoader {
 
+    private static final Yaml YAML = new Yaml(new Constructor(YamlResourceManager.class));
+
     public ResourceManager load(InputStream stream) {
-        Yaml yaml = new Yaml(new Constructor(YamlResourceManager.class));
-
-        YamlResourceManager yamlResourceManager = yaml.load(stream);
-
+        YamlResourceManager yamlResourceManager = YAML.load(stream);
         return mapYamlResourceManager(yamlResourceManager);
     }
 
     private ResourceManager mapYamlResourceManager(YamlResourceManager yaml) {
-
         ResourceManager manager = new ResourceManager();
 
         for (YamlResource yamlResource : yaml.getResources()) {
-            manager.addMapping(yamlResource.getKey(), mapYamlResourceMapping(yamlResource));
+            String key = yamlResource.getKey();
+            if (key == null) {
+                throw new IllegalArgumentException("Missing Resource Key!");
+            }
+            manager.addMapping(key, mapYamlResourceMapping(yamlResource));
         }
 
         return manager;
@@ -35,11 +37,13 @@ public class YamlResourceManagerLoader {
 
     private ResourceMapping mapYamlResourceMapping(YamlResource resource) {
         Set<String> options = resource.getOptions() != null ? resource.getOptions() : Collections.emptySet();
+
         return ResourceMapping.builder()
                 .defaultResource(Resource.load(resource.getDefaultLocation()))
                 .label(resource.getLabel())
                 .description(resource.getDescription())
                 .options(options.stream()
+                        .map(String::toUpperCase)
                         .map(ResourceMapping.Option::valueOf)
                         .collect(toSet()))
                 .build();

src/test/resources/resources-example.yml

@@ -3,6 +3,7 @@ resources:
     label: Airplane Image
     description: An image of an airplane
     options:
+      - required
     defaultLocation: classpath:/data/airplane.png
     types:
       - image/png