fix issue json-path#762 and add some test cases. (#821)

* fix issue json-path#762

* fix issue json-path#762

json-path/src/main/java/com/jayway/jsonpath/spi/json/JsonSmartJsonProvider.java

@@ -83,6 +83,8 @@ public class JsonSmartJsonProvider extends AbstractJsonProvider {
             return JSONObject.toJSONString((Map<String, ?>) obj, JSONStyle.LT_COMPRESS);
         } else if (obj instanceof List) {
             return JSONArray.toJSONString((List<?>) obj, JSONStyle.LT_COMPRESS);
+        } else if (obj instanceof Number ||  obj instanceof Boolean){
+            return JSONValue.toJSONString(obj);
         } else {
             throw new UnsupportedOperationException(obj.getClass().getName() + " can not be converted to JSON");
         }

json-path/src/test/java/com/jayway/jsonpath/Issue_762.java

@@ -0,0 +1,20 @@
+package com.jayway.jsonpath;
+
+import org.junit.Test;
+
+import static com.jayway.jsonpath.BaseTest.JSON_DOCUMENT;
+
+
+/**
+ * test for issue 762
+ */
+
+public class Issue_762 {
+    @Test
+    public void testParseJsonValue(){
+        assert(JsonPath.parse(5).jsonString().equals("5"));
+        assert(JsonPath.parse(5.0).jsonString().equals("5.0"));
+        assert(JsonPath.parse(true).jsonString().equals("true"));
+        assert(JsonPath.parse(false).jsonString().equals("false"));
+    }
+}