在 java 库中调用方法时对重载定义的引用不明确

Question

import com.alibaba.fastjson.JSON

object test {
  def main(args: Array[String]) = {
    val map = new util.HashMap[CharSequence, CharSequence]()
    map.put("123", "22333")
    map.put("test", null)
    val ret = JSON.toJSONString(map)
    println(ret)
   }
}

toJSONString 功能：

public static String toJSONString(Object object) {
    return toJSONString(object, emptyFilters, new SerializerFeature[0]);
}

public static String toJSONString(Object object, SerializerFeature... features) {
    return toJSONString(object, DEFAULT_GENERATE_FEATURE, features);
}

错误：

Error:ambiguous reference to overloaded definition,both method toJSONString in object JSON of
type (x: Any, x: com.alibaba.fastjson.serializer.SerializerFeature*)String
and method toJSONString in object JSON of
type (x: Any)String 
match argument types (java.util.HashMap[CharSequence,CharSequence])
val ret = JSON.toJSONString(map)

Answer 1

出于某种原因，Scala 重载逻辑与 Java 逻辑不匹配。你必须这样称呼它：

JSON.toJSONString(map, SerializerFeature.PrettyFormat)

祝你有愉快的一天！

Answer 2

鼓掌！

args SerializerFeature.EMPTY: _* 作为默认格式！

val jsonString = JSON.toJSONString(obj, SerializerFeature.EMPTY: _*)

参考文献：https://github.com/alibaba/fastjson/issues/1282#issuecomment-624461007

在 java 库中调用方法时对重载定义的引用不明确

ambiguous reference to overloaded definition when call method in java library

java

scala

reference

ambiguous