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使用kotlin的data class 时会报错：没有默认构造器 #1607

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使用kotlin的data class 时会报错：没有默认构造器#1607
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1.1.68.android
@KingLanding94

Description

@KingLanding94
KingLanding94
opened on Nov 24, 2017

用的是kotlin使用范例上面的内容，但是程序依然会崩溃。期待解决。

data class DataClass(@JSONField(name="aa")val a : Int, @JSONField(name="bb")val b : Int)

        val dt = DataClass(1,2)
        val json = JSON.toJSONString(dt)
        logger.e(json)
        val clz = DataClass::class
        logger.e(clz.javaObjectType.toString())
        val dt1 = JSON.parseObject(json,clz.javaObjectType)
        logger.e(dt1.toString())

出错内容：
Process: cn.ac.ia.iot.www.telemedicine, PID: 8718
com.alibaba.fastjson.JSONException: default constructor not found. class cn.ac.ia.iot.www.telemedicine.mvp.model.bean.DataClass
at com.alibaba.fastjson.parser.JavaBeanInfo.build(JavaBeanInfo.java:496)
at com.alibaba.fastjson.parser.JavaBeanDeserializer.(JavaBeanDeserializer.java:35)
at com.alibaba.fastjson.parser.ParserConfig.getDeserializer(ParserConfig.java:229)
at com.alibaba.fastjson.parser.ParserConfig.getDeserializer(ParserConfig.java:148)
at com.alibaba.fastjson.parser.DefaultJSONParser.parseObject(DefaultJSONParser.java:683)
at com.alibaba.fastjson.parser.DefaultJSONParser.parseObject(DefaultJSONParser.java:659)
at com.alibaba.fastjson.JSON.parseObject(JSON.java:238)
at com.alibaba.fastjson.JSON.parseObject(JSON.java:210)
at com.alibaba.fastjson.JSON.parseObject(JSON.java:169)
at com.alibaba.fastjson.JSON.parseObject(JSON.java:278)
at cn.ac.ia.iot.www.telemedicine.mvp.presenter.ActivityLoginPresenter.attemptLogin(ActivityLoginPresenter.kt:44)
at cn.ac.ia.iot.www.telemedicine.ui.activity.LoginActivity.attemptLogin(LoginActivity.kt:74)
at cn.ac.ia.iot.www.telemedicine.ui.activity.LoginActivity.onClick(LoginActivity.kt:88)
at android.view.View.performClick(View.java:4790)
at android.view.View$PerformClick.run(View.java:19924)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5418)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1037)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:832)

Activity

KingLanding94

KingLanding94 commented on Nov 24, 2017

@KingLanding94
KingLanding94
on Nov 24, 2017
Author

报错时使用的是 fastjson:1.1.67.android

改成 fastjson:1.2.41 程序就可以正常运行了。

KingLanding94
closed this as completedon Nov 24, 2017
KingLanding94
reopened this on Nov 24, 2017
StanNing

StanNing commented on Nov 28, 2017

@StanNing
StanNing
on Nov 28, 2017

这个问题经过验证依然存在， @wenshao 问一下什么版本可以解决啊？data class 使用的场景实在太多了

wenshao

wenshao commented on Dec 11, 2017

@wenshao
wenshao
on Dec 11, 2017
Member

@StanNing 能提供重现问题的testcase么？

StanNing

StanNing commented on Dec 13, 2017

@StanNing
StanNing
on Dec 13, 2017

@wenshao
data class JsonDemo1(var a: JsonDemo2 = JsonDemo2())
data class JsonDemo2(var b: String = "")

    @Test
    fun test2() {
        val s1 = "{\"a\":{\"b\":123}}"
        val demo = s1.toJsonObject(JsonDemo1::class.java)
        logd(demo?.toJson())
    }


fun <T> String.toJsonObject(parseClass: Class<T>): T? {
    var t: T? = null
    try {
        t = JSON.parseObject(this, parseClass)
    } catch (e: Exception) {
        loge(e)
    }
    return t
}

    fun Any.toJson(): String {
        var jsonStr = ""
        try {
            jsonStr = JSON.toJSONString(this) //现在替换为FastJson
        } catch (e: Exception) {
            loge(e)
        }
        return jsonStr
    }

在Android项目中
implementation "com.alibaba:fastjson:1.2.41" 上面报错 default constructor not found.
换回1.2.31就正常了。

compile 'com.alibaba:fastjson:1.1.67.android' 使用Android平台的同样会出现上面这个错误。
wenshao
added this to the 1.1.68.android milestone on Dec 13, 2017
Lua12138

Lua12138 commented on Dec 22, 2017

@Lua12138
Lua12138
on Dec 22, 2017

@wenshao the same issue

Moyuchen

Moyuchen commented on Dec 11, 2018

@Moyuchen
Moyuchen
on Dec 11, 2018

解决了，加一行compile "org.jetbrains.kotlin:kotlin-reflect:$kotlin_version"，使用的时1.2.54

GuitarDian

GuitarDian commented on Jul 8, 2019

@GuitarDian
GuitarDian
on Jul 8, 2019

楼上兄弟厉害。我试过noarg，allopen，都配置不了。
implementation "org.jetbrains.kotlin:kotlin-reflect:$kotlin_version" 完美解决，版本1.3.40

ifynn

ifynn commented on Oct 23, 2020

@ifynn
ifynn
on Oct 23, 2020

@wenshao @GuitarDian 为什么我加了implementation "org.jetbrains.kotlin:kotlin-reflect:$kotlin_version" ，还是会报 default constructor not found

REBOOTERS

REBOOTERS commented on Jul 10, 2023

@REBOOTERS
REBOOTERS
on Jul 10, 2023

依赖添加
implementation "org.jetbrains.kotlin:kotlin-reflect:$kotlin_version" 之后，依然报 default constructor not found 错误的，可以在混淆配置添加

-keepattributes *Annotation*
-keep class kotlin.** { *; }
-keep class org.jetbrains.** { *; }

亲测有效

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          使用kotlin的data class 时会报错：没有默认构造器 · Issue #1607 · alibaba/fastjson