class 对象未在 Gson 中转换

Question

我有一个名为 class 的消息，我希望它使用 Gson 库转换为 json，但它抛出计算器异常，这是我的 class

package models.Notifications
import models.Notifications.MessageStatus._
import models.Notifications.DeleteStatus._
import com.mongodb.BasicDBObject
import com.mongodb.ReflectionDBObject

import org.joda.time.DateTime


@SerialVersionUID(1)
class Message(val uuid : Int,val subject : String, val bodyText : String, var artworkUuid : Int, val dateTime : DateTime) extends  Serializable{

  def this()  = {  
    this(0,"","",1,DateTime.parse("0"))
  }

var messageStatus : MessageStatus = READ
var delete : DeleteStatus = DELETED

def this(uuid: Int,
    subject : String,
    bodyText : String,
    artworkUuid : Int,
    dateTime : DateTime,
    messageStatus : MessageStatus,
    delete : DeleteStatus
    ){
this( uuid , subject , bodyText , artworkUuid,dateTime)
this.messageStatus = messageStatus
this.delete= delete
}

/* 
 *getters 
 * */

  def getUuid : Int ={
  uuid
  } 

  def getSubject : String ={
  subject
  } 

  def getBodyText : String ={
  bodyText
  } 

  def getArtworkUuid : Int ={
  artworkUuid
  }

   def getDateTime : DateTime ={
  dateTime 
  } 


}

我正在 json 中像这样转换它

object Test extends app{
import com.google.gson._
 val createdDate = new DateTime(year1, month1, day1, hour1, min1)

val message=new Message(123,"subject","bodyText",100,createdDate,READ,DELETED)
  val gson = new Gson();
        try{
           val g=gson.toJson(message)

        }catch{
          case e:Exception=>e.printStackTrace()
        }

}

我遇到了以下异常

java.lang.WhosebugError
    at com.google.gson.reflect.TypeToken.equals(TypeToken.java:284)
    at java.util.HashMap.getNode(HashMap.java:571)
    at java.util.HashMap.get(HashMap.java:556)
    at java.util.Collections$SynchronizedMap.get(Collections.java:2584)
    at com.google.gson.Gson.getAdapter(Gson.java:335)
    at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write(TypeAdapterRuntimeTypeWrapper.java:55)
    at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.write(ReflectiveTypeAdapterFactory.java:99)
    at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.write(ReflectiveTypeAdapterFactory.java:219)
    at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write(TypeAdapterRuntimeTypeWrapper.java:68)
    at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.write(ReflectiveTypeAdapterFactory.java:99)
    at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.write(ReflectiveTypeAdapterFactory.java:219)
    at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write(TypeAdapterRuntimeTypeWrapper.java:68)
    at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.write(ReflectiveTypeAdapterFactory.java:99)
    at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.write(ReflectiveTypeAdapterFactory.java:219)
    at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write(TypeAdapterRuntimeTypeWrapper.java:68)
    at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.write(ReflectiveTypeAdapterFactory.java:99)
    at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.write(ReflectiveTypeAdapterFactory.java:219)
    at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write(TypeAdapterRuntimeTypeWrapper.java:68)
    at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.write(ReflectiveTypeAdapterFactory.java:99)

我在堆栈上发现了一些类似的问题，但我没有解决我的问题，如果我的 class 包含循环引用我应该如何删除它并使它工作请帮助我

这是两个 classes

object ReadStatus extends Enumeration{


  type ReadStatus = Value
  val READ , UNREAD = Value

}
package models.UserNotifications.MailMessages

object DeleteStatus extends Enumeration {

  type DeleteStatus = Value
  val DELETED, ACTIVE = Value

}

Answer 1

delete 和 messageStatus 字段包含在序列化中，其中之一包含一些循环依赖性。我要么添加 @transient 注释：

@transient var delete : DeleteStatus = DELETED

或要求 Gson exclude these fields。

class 对象未在 Gson 中转换

class object is not converting in Gson

json

scala

gson

scala-2.11