kotlin data class 和泛型JSON.parseObject<Entity>(json)的bug[BUG]

[ozy1996]

kotlin 中解析 data class的问题，是不支持kotlin还是bug呢

1.使用val data = JSON.parseObject<Entity>(json) 会报错
2.val data = JSON.parseObject(json,Entity::class.java)解析不出来，结果是显示默认值，如果entity没有默认值就报错
3.不指定泛型JSON.parseObject(json) 或者 实体类用 class 则不会报错，

data class Entity(
    val name: String = "", val age: Int = 0
)

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val json = """
            {
                "age":5,
                "name":"1234243"
            }
        """.trimIndent()
        val data = json.parseObject<Entity>()
 //           val data = JSON.parseObject<Entity>(json)
//            val data = JSON.parseObject(json,Entity::class.java)
        Log.w("=========>>", "======>>>data:${data}")
    }
}

implementation("com.alibaba.fastjson2:fastjson2-kotlin:2.0.32")
implementation("com.alibaba.fastjson2:fastjson2-extension:2.0.32")

日志信息

com.alibaba.fastjson2.JSONException: TODO, offset 14, character {, line 2, column 15, fastjson-version 2.0.32
W/System.err: 
W/System.err:             {
W/System.err:                 "age":5,
W/System.err:                 "name":"1234243"
W/System.err:             }
W/System.err:         
W/System.err:     at com.alibaba.fastjson2.reader.ObjectArrayReaderMultiType.readObject(ObjectArrayReaderMultiType.java:73)
W/System.err:     at com.alibaba.fastjson2.JSON.parseObject(JSON.java:826)
W/System.err:     at com.alibaba.fastjson2.JSON.parseObject(JSON.java:849)
W/System.err:     at com.example.myapplication.MainActivity.onCreate(MainActivity.kt:23)
W/System.err:     at android.app.Activity.performCreate(Activity.java:8181)
W/System.err:     at android.app.Activity.performCreate(Activity.java:8147)
W/System.err:     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1329)
W/System.err:     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3755)
W/System.err:     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3949)
W/System.err:     at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:106)
W/System.err:     at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
W/System.err:     at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
W/System.err:     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2327)
W/System.err:     at android.os.Handler.dispatchMessage(Handler.java:106)
W/System.err:     at android.os.Looper.loopOnce(Looper.java:210)
W/System.err:     at android.os.Looper.loop(Looper.java:299)
W/System.err:     at android.app.ActivityThread.main(ActivityThread.java:8307)

[kraity]

您好, 麻烦提供一下Android版本,
若有混淆配置可以提供关键的部分

日志是否类似有 W/cn.krait.test: Accessing hidden field Ljava/lang/invoke******* (blacklist, reflection, denied) 这样的提示, 也可以提供您的部分运行日志

[ozy1996]

您好, 麻烦提供一下Android版本, 若有混淆配置可以提供关键的部分

日志是否类似有 W/cn.krait.test: Accessing hidden field Ljava/lang/invoke******* (blacklist, reflection, denied) 这样的提示, 也可以提供您的部分运行日志

您好，这是我的demo http://cloud.file.tdconnect.cn/upload/2023-05-19/2d1a2616-cd38-4ec8-8a62-2976cbac0aeb.zip

[wenshao]

https://github.com/alibaba/fastjson2/releases/tag/2.0.33
请用新版本验证

[ozy1996]

https://github.com/alibaba/fastjson2/releases/tag/2.0.33 请用新版本验证
在kotlin中还是一样

implementation("com.alibaba.fastjson2:fastjson2-kotlin:2.0.33")

验证结果：
1. 使用val data = JSON.parseObject(json,Entity::class.java)，如果Entity为data class，字段有默认值，解析不会报错，但是解析不出来字段没赋值。字段没有默认值，会报错，如果Entity为普通的class则正常解析
2. 使用val data = JSON.parseObject<Entity>(json)，不管是data class 还是普通class 都会报错

val data = JSON.parseObject<Entity>(json)报错日志

W/e.myapplicatio: Accessing hidden method Landroid/view/View;->computeFitSystemWindows(Landroid/graphics/Rect;Landroid/graphics/Rect;)Z (unsupported, reflection, allowed)
W/e.myapplicatio: Accessing hidden method Landroid/view/ViewGroup;->makeOptionalFitsSystemWindows()V (unsupported, reflection, allowed)
W/e.myapplicatio: Accessing hidden method Ljava/lang/invoke/LambdaMetafactory;->metafactory(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; (blocked, linking, denied)
W/e.myapplicatio: Accessing hidden method Ljava/lang/invoke/LambdaMetafactory;->metafactory(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; (blocked, linking, denied)
W/e.myapplicatio: Accessing hidden method Ljava/lang/invoke/LambdaMetafactory;->metafactory(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; (blocked, linking, denied)
W/e.myapplicatio: Accessing hidden method Ljava/lang/invoke/LambdaMetafactory;->metafactory(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; (blocked, linking, denied)
W/e.myapplicatio: Accessing hidden method Ljava/lang/invoke/LambdaMetafactory;->metafactory(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; (blocked, linking, denied)
W/e.myapplicatio: Accessing hidden method Ljava/lang/invoke/LambdaMetafactory;->metafactory(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; (blocked, linking, denied)
W/e.myapplicatio: Accessing hidden method Ljava/lang/invoke/LambdaMetafactory;->metafactory(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; (blocked, linking, denied)
W/e.myapplicatio: Accessing hidden method Ljava/lang/invoke/LambdaMetafactory;->metafactory(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; (blocked, linking, denied)
W/e.myapplicatio: Accessing hidden method Ljava/lang/invoke/LambdaMetafactory;->metafactory(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; (blocked, linking, denied)
W/e.myapplicatio: Accessing hidden method Ljava/lang/invoke/LambdaMetafactory;->metafactory(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; (blocked, linking, denied)
W/e.myapplicatio: Accessing hidden method Ljava/lang/invoke/LambdaMetafactory;->metafactory(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; (blocked, linking, denied)
W/e.myapplicatio: Accessing hidden method Ljava/lang/invoke/LambdaMetafactory;->metafactory(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; (blocked, linking, denied)
W/e.myapplicatio: Accessing hidden method Ljava/lang/invoke/LambdaMetafactory;->metafactory(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; (blocked, linking, denied)
W/e.myapplicatio: Accessing hidden method Ljava/lang/invoke/LambdaMetafactory;->metafactory(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; (blocked, linking, denied)
W/e.myapplicatio: Accessing hidden method Ljava/lang/invoke/LambdaMetafactory;->metafactory(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; (blocked, linking, denied)
E/e.myapplicatio: The String#value field is not present on Android versions >= 6.0
W/e.myapplicatio: Accessing hidden field Ljava/math/BigDecimal;->intCompact:J (blocked, reflection, denied)
W/e.myapplicatio: Accessing hidden field Ljava/lang/invoke/MethodHandles$Lookup;->IMPL_LOOKUP:Ljava/lang/invoke/MethodHandles$Lookup; (blocked, reflection, denied)
W/e.myapplicatio: Accessing hidden method Ljava/lang/invoke/LambdaMetafactory;->metafactory(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; (blocked, linking, denied)
W/e.myapplicatio: Accessing hidden method Ljava/lang/invoke/LambdaMetafactory;->metafactory(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; (blocked, linking, denied)
W/e.myapplicatio: Accessing hidden method Ljava/lang/invoke/LambdaMetafactory;->metafactory(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; (blocked, linking, denied)
W/e.myapplicatio: Accessing hidden method Ljava/lang/invoke/LambdaMetafactory;->metafactory(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; (blocked, linking, denied)
W/e.myapplicatio: Accessing hidden method Ljava/lang/invoke/LambdaMetafactory;->metafactory(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; (blocked, linking, denied)
W/e.myapplicatio: Accessing hidden method Ljava/lang/invoke/LambdaMetafactory;->metafactory(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; (blocked, linking, denied)
W/e.myapplicatio: Accessing hidden method Ljava/lang/invoke/LambdaMetafactory;->metafactory(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; (blocked, linking, denied)
W/e.myapplicatio: Accessing hidden method Ljava/lang/invoke/LambdaMetafactory;->metafactory(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; (blocked, linking, denied)
W/e.myapplicatio: Accessing hidden method Ljava/lang/invoke/LambdaMetafactory;->metafactory(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; (blocked, linking, denied)
W/e.myapplicatio: Accessing hidden method Ljava/lang/invoke/LambdaMetafactory;->metafactory(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; (blocked, linking, denied)
W/e.myapplicatio: Accessing hidden method Ljava/lang/invoke/LambdaMetafactory;->metafactory(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; (blocked, linking, denied)
W/e.myapplicatio: Accessing hidden method Ljava/lang/invoke/LambdaMetafactory;->metafactory(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; (blocked, linking, denied)
W/System.err: com.alibaba.fastjson2.JSONException: TODO, offset 1, character {, line 1, column 2, fastjson-version 2.0.33 {"field1":"123fd23453454354"}
W/System.err:     at com.alibaba.fastjson2.reader.ObjectArrayReaderMultiType.readObject(ObjectArrayReaderMultiType.java:73)
W/System.err:     at com.alibaba.fastjson2.JSON.parseObject(JSON.java:826)
W/System.err:     at com.alibaba.fastjson2.JSON.parseObject(JSON.java:849)
W/System.err:     at com.example.myapplication.MainActivity.onCreate(MainActivity.kt:16)
W/System.err:     at android.app.Activity.performCreate(Activity.java:8181)
W/System.err:     at android.app.Activity.performCreate(Activity.java:8147)
W/System.err:     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1329)
W/System.err:     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3755)
W/System.err:     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3949)
W/System.err:     at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:106)
W/System.err:     at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
W/System.err:     at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
W/System.err:     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2327)
W/System.err:     at android.os.Handler.dispatchMessage(Handler.java:106)
W/System.err:     at android.os.Looper.loopOnce(Looper.java:210)
W/System.err:     at android.os.Looper.loop(Looper.java:299)
W/System.err:     at android.app.ActivityThread.main(ActivityThread.java:8307)
W/System.err:     at java.lang.reflect.Method.invoke(Native Method)
W/System.err:     at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:577)
W/System.err:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1073)
I/SurfaceFactory: [static] sSurfaceFactory = com.mediatek.view.impl.SurfaceFactoryImpl@578a56d
I/MsyncFactory: [static] sMsyncFactory = com.mediatek.view.impl.MsyncFactoryImpl@613d5a2
D/ViewRootImpl[MainActivity]: hardware acceleration = true, sRendererEnabled = true, forceHwAccelerated = false
D/libMEOW: meow new tls: 0xb400007b5ae83080
D/libMEOW: applied 1 plugins for [com.example.myapplication]:
D/libMEOW:   plugin 1: [libMEOW_gift.so]:

[wenshao]

您好, 麻烦提供一下Android版本, 若有混淆配置可以提供关键的部分
日志是否类似有 W/cn.krait.test: Accessing hidden field Ljava/lang/invoke******* (blacklist, reflection, denied) 这样的提示, 也可以提供您的部分运行日志

您好，这是我的demo http://cloud.file.tdconnect.cn/upload/2023-05-19/2d1a2616-cd38-4ec8-8a62-2976cbac0aeb.zip

这个demo无法下载

[senselesscn]

您好, 麻烦提供一下Android版本, 若有混淆配置可以提供关键的部分
日志是否类似有 W/cn.krait.test: Accessing hidden field Ljava/lang/invoke******* (blacklist, reflection, denied) 这样的提示, 也可以提供您的部分运行日志

您好，这是我的demo http://cloud.file.tdconnect.cn/upload/2023-05-19/2d1a2616-cd38-4ec8-8a62-2976cbac0aeb.zip

这个demo无法下载

复制url粘贴到浏览器地址栏就可以下载了

[kraity]

@ozy1996 并非BUG, 报错原因为: 调用错误、缺少反射库, 如下

调用错误:
JSON.parseObject<Entity>(json) 该片段在kotlin下会误调用JSON.parseObject(String text, Type... types) 而此方法仅解析数组

缺少反射库:
当实体类是data class时, 是依赖构造参数名, 需要添加kotlin的反射库 implementation("org.jetbrains.kotlin:kotlin-reflect:1.8.0") 才能获取 kotlin data 的构造器中的所有参数名

正确使用方式:

 val text = """
            {
                "age":5,
                "name":"1234243"
            }

1.JSON.parseObject(Entity::class.java)
2. 若使用fastjson2-kotlin 也可以调用 text.parseObject<Entity>()

同时若使用data class, 需要引入反射库 implementation("org.jetbrains.kotlin:kotlin-reflect:1.8.0"), 1.8.0替换为你的kotlin版本

@wenshao 温少, 在kotlin中调用JSON.parseObject<Entity>(json) 实际传递调用JSON.parseObject(String text, Type... types) , 是否重命名后者的函数名, 或者移除.