handling root "id" as default resolution scope in constructor instead…

… of in preceding load()

core/src/main/java/org/everit/json/schema/loader/SchemaLoader.java

@@ -59,6 +59,7 @@
 import org.everit.json.schema.loader.internal.ReferenceResolver;
 import org.everit.json.schema.loader.internal.TypeBasedMultiplexer;
 import org.json.JSONArray;
+import org.json.JSONException;
 import org.json.JSONObject;
 
 /**
@@ -215,8 +216,7 @@ public static Schema load(final JSONObject schemaJson) {
    * @return the created schema
    */
   public static Schema load(final JSONObject schemaJson, final SchemaClient httpClient) {
-    String schemaId = schemaJson.optString("id");
-    SchemaLoader loader = builder().resolutionScope(schemaId)
+    SchemaLoader loader = builder()
         .schemaJson(schemaJson)
         .httpClient(httpClient)
         .build();
@@ -271,7 +271,15 @@ public SchemaLoader(final SchemaLoaderBuilder builder) {
     this.schemaJson = Objects.requireNonNull(builder.schemaJson, "schemaJson cannot be null");
     this.rootSchemaJson = Objects.requireNonNull(builder.getRootSchemaJson(),
         "rootSchemaJson cannot be null");
-    this.id = builder.id;
+    URI id = builder.id;
+    if (id == null && builder.schemaJson.has("id")) {
+      try {
+        id = new URI(builder.schemaJson.getString("id"));
+      } catch (JSONException | URISyntaxException e) {
+        throw new RuntimeException(e);
+      }
+    }
+    this.id = id;
     this.httpClient = Objects.requireNonNull(builder.httpClient, "httpClient cannot be null");
     this.pointerSchemas = Objects.requireNonNull(builder.pointerSchemas,
         "pointerSchemas cannot be null");

core/src/test/java/org/everit/json/schema/loader/SchemaLoaderTest.java

@@ -425,6 +425,16 @@ public void unsupportedFormat() {
     SchemaLoader.builder().schemaJson(schema).build().load();
   }
 
+  @Test
+  public void schemaJsonIdIsRecognized() {
+    SchemaClient client = Mockito.mock(SchemaClient.class);
+    ByteArrayInputStream retval = new ByteArrayInputStream("{}".getBytes());
+    Mockito.when(client.get("http://example.org/schema/schema.json")).thenReturn(retval);
+    SchemaLoader.builder().schemaJson(get("schemaWithId"))
+        .httpClient(client)
+        .build().load();
+  }
+
   @Test
   public void withoutFragment() {
     String actual = SchemaLoader.withoutFragment("http://example.com#frag").toString();

core/src/test/resources/org/everit/jsonvalidator/testschemas.json

@@ -303,6 +303,11 @@
 				"minProperties" : 1
 			}
 		}
-
+	},
+	"schemaWithId" : {
+		"id" : "http://example.org/schema/",
+		"properties" : {
+			"prop" : { "$ref" : "schema.json" } 
+		}
 	}
 }