external $ref without / caused exception

modules/swagger-parser-v3/src/test/java/io/swagger/v3/parser/test/OpenAPIV3ParserTest.java

@@ -2754,6 +2754,21 @@ public void testDiscriminatorSeparateFileExternalMapping() throws Exception {
         Assert.assertNotNull(cat);
     }
 
+
+    // Relative external refs failed on windows due to \ issue
+    @Test
+    public void testRelativePathIssue1543() {
+        OpenAPIV3Parser parser = new OpenAPIV3Parser();
+        ParseOptions options = new ParseOptions();
+        options.setResolveFully(true);
+        options.setResolve(true);
+        SwaggerParseResult readResult = parser.readLocation("src/test/resources/issue-1543/openapi.yaml", null, options);
+
+        if (readResult.getMessages().size() > 0) {
+        	Assert.assertFalse(readResult.getMessages().get(0).contains("end -1"));
+        }
+    }
+
     @Test
     public void testIssue1540() throws Exception{
         OpenAPI openAPI = new OpenAPIV3Parser().read("./issue-1540/a.json");
@@ -2768,5 +2783,4 @@ public void testIssue1540() throws Exception{
         Assert.assertNotNull(testPutExtensions.get("x-order"));
         Assert.assertEquals((String)testPutExtensions.get("x-order"),"2147483647");
     }
-
 }

modules/swagger-parser-v3/src/test/resources/issue-1543/openapi.yaml

@@ -0,0 +1,29 @@
+openapi: 3.0.1
+info:
+  title: Innotech API backend
+  description: >
+    API for the Innotech backend
+  version: 1.0.0
+
+paths:
+
+  ## Miscellaneous ###################################################################
+  "/misc/ping":
+    get:
+      tags:
+        - Ping
+      operationId: getPing
+      parameters:
+        - in: query
+          name: param
+          schema:
+            type: string
+            maxLength: 255
+          required: true
+      responses:
+        "200":
+          description: Ping response
+          content:
+            application/json:
+              schema:
+                $ref: "schemas/_index.yaml#/pingResponse"

modules/swagger-parser-v3/src/test/resources/issue-1543/schemas/PingResponse.yaml

@@ -0,0 +1,6 @@
+# schemas/PingResponse.yaml
+type: object
+properties:
+  answer:
+    type: string
+    maxLength: 255

modules/swagger-parser-v3/src/test/resources/issue-1543/schemas/_index.yaml

@@ -0,0 +1,3 @@
+# schemas/_index.yaml
+pingResponse:
+  $ref: 'PingResponse.yaml'