demo直接运行Main方法，一直报错，如下，第一次集成这个支付，好无力，求大神解答，
警告: Overriding the existing type handler for interface java.util.Map
Exception in thread "main" com.google.gson.JsonParseException: Type information is unavailable, and the target object is not a primitive: {"orderInfo":"_input_charset="utf-8"&body="Your Body"&it_b_pay="2016-06-03 16:31:15"&notify_url="https%3A%2F%2Fapi.pingxx.com%2Fnotify%2Fcharges%2Fch_yHS0CC4qTerDmznHWLj5WHKC"&out_trade_no="1464856241617rbrm4vv"&partner="2008536698119845"&payment_type="1"&seller_id="2008536698119845"&service="mobile.securitypay.pay"&subject="Your Subject"&total_fee="1.00"&sign="UG1EdVBTTGF2TEdLNW1UaTUweWZmYnJQ"&sign_type="RSA""}
at com.google.gson.JsonObjectDeserializationVisitor.visitPrimitive(JsonObjectDeserializationVisitor.java:130)
at com.google.gson.ObjectNavigator.accept(ObjectNavigator.java:116)
at com.google.gson.JsonDeserializationContextDefault.fromJsonObject(JsonDeserializationContextDefault.java:76)
at com.google.gson.JsonDeserializationContextDefault.deserialize(JsonDeserializationContextDefault.java:54)
at com.google.gson.MapTypeAdapter.deserialize(MapTypeAdapter.java:68)
at com.google.gson.MapTypeAdapter.deserialize(MapTypeAdapter.java:33)
Disconnected from the target VM, address: '127.0.0.1:58520', transport: 'socket'
at com.google.gson.JsonDeserializerExceptionWrapper.deserialize(JsonDeserializerExceptionWrapper.java:51)
at com.google.gson.JsonDeserializationVisitor.invokeCustomDeserializer(JsonDeserializationVisitor.java:92)
at com.google.gson.JsonObjectDeserializationVisitor.visitFieldUsingCustomHandler(JsonObjectDeserializationVisitor.java:117)
at com.google.gson.ReflectingFieldNavigator.visitFieldsReflectively(ReflectingFieldNavigator.java:63)
at com.google.gson.ObjectNavigator.accept(ObjectNavigator.java:120)
at com.google.gson.JsonDeserializationContextDefault.fromJsonObject(JsonDeserializationContextDefault.java:76)
at com.google.gson.JsonDeserializationContextDefault.deserialize(JsonDeserializationContextDefault.java:54)
at com.google.gson.Gson.fromJson(Gson.java:551)
at com.google.gson.Gson.fromJson(Gson.java:521)
at com.pingplusplus.net.ChargeDeserializer.deserialize(ChargeDeserializer.java:49)
at com.pingplusplus.net.ChargeDeserializer.deserialize(ChargeDeserializer.java:20)
at com.google.gson.JsonDeserializerExceptionWrapper.deserialize(JsonDeserializerExceptionWrapper.java:51)
at com.google.gson.JsonDeserializationVisitor.invokeCustomDeserializer(JsonDeserializationVisitor.java:92)
at com.google.gson.JsonDeserializationVisitor.visitUsingCustomHandler(JsonDeserializationVisitor.java:80)
at com.google.gson.ObjectNavigator.accept(ObjectNavigator.java:101)
at com.google.gson.JsonDeserializationContextDefault.fromJsonObject(JsonDeserializationContextDefault.java:76)
at com.google.gson.JsonDeserializationContextDefault.deserialize(JsonDeserializationContextDefault.java:54)
at com.google.gson.Gson.fromJson(Gson.java:551)
at com.google.gson.Gson.fromJson(Gson.java:498)
at com.google.gson.Gson.fromJson(Gson.java:467)
at com.google.gson.Gson.fromJson(Gson.java:417)
at com.google.gson.Gson.fromJson(Gson.java:389)
at com.pingplusplus.net.APIResource.request(APIResource.java:543)
at com.pingplusplus.model.Charge.create(Charge.java:274)
at com.pingxx.example.ChargeExample.createCharge(ChargeExample.java:71)
at com.pingxx.example.ChargeExample.runDemos(ChargeExample.java:37)
at com.pingxx.example.Main.main(Main.java:48)