Android混淆编译时，用到gson-2.2.2.jar进行反射解析json数据时，报ClassCastException错误

public synchronized <T> T parseJson(String json, Class<T> classOfT) throws Exception{
        
        T target = null;
        Gson gson = new Gson();
        target = gson.fromJson(json, classOfT);
        return target;
    }

    String addModel = JsonParse.getJsonParse().parseJson(jsonString, AddModel.class);
　　//其中AddModel是自己写的一个model类
　　//jsonString是一个本地文件，以Json格式存在
 

-keep public class com.android.chebaob.model.AddModel{
    *;
}

##---------------Begin: proguard configuration for Gson  ----------
# Gson uses generic type information stored in a class file when working with fields. Proguard
# removes such information by default, so configure it to keep all of it.
-keepattributes Signature

# For using GSON @Expose annotation
-keepattributes *Annotation*

# Gson specific classes
-keep class sun.misc.Unsafe { *; }
#-keep class com.google.gson.stream.** { *; }

# Application classes that will be serialized/deserialized over Gson
-keep class com.google.gson.examples.android.model.** { *; }

##---------------End: proguard configuration for Gson  ----------