Added a test that I previously deleted and fixed it so that it correctly reproduces the problem described in issue #12.

Author: Jake Waffle

src/test/java/com/networknt/schema/SelfRefTest.java

@@ -0,0 +1,32 @@
+/*
+ * Copyright (c) 2016 Network New Technologies Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.networknt.schema;
+
+import org.junit.Ignore;
+import org.junit.Test;
+
+/**
+ * Created by stevehu on 2016-12-20.
+ */
+public class SelfRefTest extends BaseJsonSchemaValidatorTest {
+    @Ignore("This test currently is failing because of a StackOverflow caused by a recursive $ref.")
+    @Test()
+    public void testSelfRef() throws Exception {
+        JsonSchema node = getJsonSchemaFromClasspath("selfRef.json");
+        System.out.println("node = " + node);
+    }
+}

src/test/resources/selfRef.json

@@ -0,0 +1,31 @@
+{
+  "type": "object",
+  "properties": {
+    "name": {
+      "type": "string"
+    },
+    "tree": {
+      "$ref": "#/definitions/tree"
+    }
+  },
+  "definitions": {
+    "tree": {
+      "type": "object",
+      "properties": {
+        "value": {
+          "type": "string"
+        },
+        "branches": {
+          "type": "array",
+          "items": {
+            "$ref": "#/definitions/tree"
+          },
+          "minItems": 1
+        }
+      },
+      "required": [
+        "value"
+      ]
+    }
+  }
+}