解组时找不到类

【问题标题】：Class not found when unmarshalling解组时找不到类
【发布时间】：2015-04-27 11:02:54
【问题描述】：

我试图在片段之间传递对象，并且我使用 Parcelable 接口。

这是我的课程，但 ArrayList 属性有些问题，正如我得到的那样：

java.lang.ClassNotFoundException: hu.company.myapp.modul.RaceDayUnit

我的班级有一个 RaceDayUnits 的 ArrayList。一切正常，直到我开始使用 ArrayList。

如果可以的话，请帮忙。

我的班级：

public class RegattaUnit implements Parcelable {

public String id;
public String name;
public String type;
public String status;
public String token;

public ArrayList<RaceDayUnit> raceDays = new ArrayList<RaceDayUnit>();


public static class Status {
    public static String NEW = "invited";
    public static String JOINED = "joined";
    public static String DECLINED = "declined";
}

public RegattaUnit() {
}

// not used at all
@Override
public int describeContents() {
    return 0;
}

@Override
public void writeToParcel(Parcel out, int flags) {
    out.writeString(id);
    out.writeString(name);
    out.writeString(type);
    out.writeString(status);
    out.writeString(token);
    out.writeList(raceDays);
}

private RegattaUnit(Parcel in) {
    id = in.readString();
    name = in.readString();
    type = in.readString();
    status = in.readString();
    token = in.readString();

    raceDays = new ArrayList<RaceDayUnit>();
    in.readList(raceDays, null);
}


public static final Creator<RegattaUnit> CREATOR = new Creator<RegattaUnit>() {

    public RegattaUnit createFromParcel(Parcel in) {
        return new RegattaUnit(in);
    }

    public RegattaUnit[] newArray(int size) {
        return new RegattaUnit[size];
    }
};

 public RegattaUnit(JSONObject regattaJSONObject, String status) throws JSONException {

  //parsing from a jsonObject, the ArrayList is getting filled here.


    }




}


}

和日志输出：

04-27 12:54:23.014: E/Parcel(9257): Class not found when unmarshalling: hu.mycomp.myapp.modul.RaceDayUnit
    04-27 12:54:23.014: E/Parcel(9257): java.lang.ClassNotFoundException: hu.mycomp.myapp.modul.RaceDayUnit
    04-27 12:54:23.014: E/Parcel(9257):     at java.lang.Class.classForName(Native Method)
    04-27 12:54:23.014: E/Parcel(9257):     at java.lang.Class.forName(Class.java:309)
    04-27 12:54:23.014: E/Parcel(9257):     at java.lang.Class.forName(Class.java:273)
    04-27 12:54:23.014: E/Parcel(9257):     at android.os.Parcel.readParcelableCreator(Parcel.java:2281)
    04-27 12:54:23.014: E/Parcel(9257):     at android.os.Parcel.readParcelable(Parcel.java:2245)
    04-27 12:54:23.014: E/Parcel(9257):     at android.os.Parcel.readValue(Parcel.java:2152)
    04-27 12:54:23.014: E/Parcel(9257):     at android.os.Parcel.readListInternal(Parcel.java:2526)
    04-27 12:54:23.014: E/Parcel(9257):     at android.os.Parcel.readList(Parcel.java:1661)
    04-27 12:54:23.014: E/Parcel(9257):     at hu.mycomp.myapp.modul.RegattaUnit.<init>(RegattaUnit.java:58)
    04-27 12:54:23.014: E/Parcel(9257):     at hu.mycomp.myapp.RegattaUnit.<init>(RegattaUnit.java:14)
    04-27 12:54:23.014: E/Parcel(9257):     at hu.mycomp.myapp.RegattaUnit$1.createFromParcel(RegattaUnit.java:113)
    04-27 12:54:23.014: E/Parcel(9257):     at hu.mycomp.myapp.RegattaUnit$1.createFromParcel(RegattaUnit.java:110)
    04-27 12:54:23.014: E/Parcel(9257):     at android.os.Parcel.readParcelable(Parcel.java:2252)
    04-27 12:54:23.014: E/Parcel(9257):     at android.os.Parcel.readValue(Parcel.java:2152)
    04-27 12:54:23.014: E/Parcel(9257):     at android.os.Parcel.readArrayMapInternal(Parcel.java:2485)
    04-27 12:54:23.014: E/Parcel(9257):     at android.os.BaseBundle.unparcel(BaseBundle.java:221)
    04-27 12:54:23.014: E/Parcel(9257):     at android.os.BaseBundle.getString(BaseBundle.java:918)
    04-27 12:54:23.014: E/Parcel(9257):     at hu.mycomp.myapp.service.GpsService.onStartCommand(GpsService.java:117)
    04-27 12:54:23.014: E/Parcel(9257):     at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:2894)
    04-27 12:54:23.014: E/Parcel(9257):     at android.app.ActivityThread.access$2100(ActivityThread.java:151)
    04-27 12:54:23.014: E/Parcel(9257):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1401)
    04-27 12:54:23.014: E/Parcel(9257):     at android.os.Handler.dispatchMessage(Handler.java:102)
    04-27 12:54:23.014: E/Parcel(9257):     at android.os.Looper.loop(Looper.java:135)
    04-27 12:54:23.014: E/Parcel(9257):     at android.app.ActivityThread.main(ActivityThread.java:5254)
    04-27 12:54:23.014: E/Parcel(9257):     at java.lang.reflect.Method.invoke(Native Method)
    04-27 12:54:23.014: E/Parcel(9257):     at java.lang.reflect.Method.invoke(Method.java:372)
    04-27 12:54:23.014: E/Parcel(9257):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
    04-27 12:54:23.014: E/Parcel(9257):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
    04-27 12:54:23.014: E/Parcel(9257): Caused by: java.lang.ClassNotFoundException: Didn't find class "hu.mycomp.myapp.modul.RaceDayUnit" on path: DexPathList[[directory "."],nativeLibraryDirectories=[/vendor/lib, /system/lib]]
    04-27 12:54:23.014: E/Parcel(9257):     at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
    04-27 12:54:23.014: E/Parcel(9257):     at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
    04-27 12:54:23.014: E/Parcel(9257):     at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
    04-27 12:54:23.014: E/Parcel(9257):     ... 28 more
    04-27 12:54:23.014: E/Parcel(9257):     Suppressed: java.lang.ClassNotFoundException: hu.mycomp.myapp.modul.RaceDayUnit
    04-27 12:54:23.014: E/Parcel(9257):         at java.lang.Class.classForName(Native Method)
    04-27 12:54:23.014: E/Parcel(9257):         at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
    04-27 12:54:23.014: E/Parcel(9257):         at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
    04-27 12:54:23.014: E/Parcel(9257):         at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
    04-27 12:54:23.014: E/Parcel(9257):         ... 29 more
    04-27 12:54:23.014: E/Parcel(9257):     Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack available
    04-27 12:54:23.015: D/AndroidRuntime(9257): Shutting down VM
    04-27 12:54:23.021: E/AndroidRuntime(9257): FATAL EXCEPTION: main
    04-27 12:54:23.021: E/AndroidRuntime(9257): Process: hu.mycomp.myapp, PID: 9257
    04-27 12:54:23.021: E/AndroidRuntime(9257): java.lang.RuntimeException: Unable to start service hu.mycomp.myapp.service.GpsService@16aad1da with Intent { flg=0x4 cmp=hu.mycomp.myapp/.service.GpsService (has extras) }: android.os.BadParcelableException: ClassNotFoundException when unmarshalling: hu.mycomp.myapp.modul.RaceDayUnit
    04-27 12:54:23.021: E/AndroidRuntime(9257):     at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:2911)
    04-27 12:54:23.021: E/AndroidRuntime(9257):     at android.app.ActivityThread.access$2100(ActivityThread.java:151)
    04-27 12:54:23.021: E/AndroidRuntime(9257):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1401)
    04-27 12:54:23.021: E/AndroidRuntime(9257):     at android.os.Handler.dispatchMessage(Handler.java:102)
    04-27 12:54:23.021: E/AndroidRuntime(9257):     at android.os.Looper.loop(Looper.java:135)
    04-27 12:54:23.021: E/AndroidRuntime(9257):     at android.app.ActivityThread.main(ActivityThread.java:5254)
    04-27 12:54:23.021: E/AndroidRuntime(9257):     at java.lang.reflect.Method.invoke(Native Method)
    04-27 12:54:23.021: E/AndroidRuntime(9257):     at java.lang.reflect.Method.invoke(Method.java:372)
    04-27 12:54:23.021: E/AndroidRuntime(9257):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
    04-27 12:54:23.021: E/AndroidRuntime(9257):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
    04-27 12:54:23.021: E/AndroidRuntime(9257): Caused by: android.os.BadParcelableException: ClassNotFoundException when unmarshalling: hu.mycomp.myapp.modul.RaceDayUnit
    04-27 12:54:23.021: E/AndroidRuntime(9257):     at android.os.Parcel.readParcelableCreator(Parcel.java:2295)
    04-27 12:54:23.021: E/AndroidRuntime(9257):     at android.os.Parcel.readParcelable(Parcel.java:2245)
    04-27 12:54:23.021: E/AndroidRuntime(9257):     at android.os.Parcel.readValue(Parcel.java:2152)
    04-27 12:54:23.021: E/AndroidRuntime(9257):     at android.os.Parcel.readListInternal(Parcel.java:2526)
    04-27 12:54:23.021: E/AndroidRuntime(9257):     at android.os.Parcel.readList(Parcel.java:1661)
    04-27 12:54:23.021: E/AndroidRuntime(9257):     at hu.mycomp.myapp.modul.RegattaUnit.<init>(RegattaUnit.java:58)
    04-27 12:54:23.021: E/AndroidRuntime(9257):     at hu.mycomp.myapp.modul.RegattaUnit.<init>(RegattaUnit.java:14)
    04-27 12:54:23.021: E/AndroidRuntime(9257):     at hu.mycomp.myapp.modul.RegattaUnit$1.createFromParcel(RegattaUnit.java:113)
    04-27 12:54:23.021: E/AndroidRuntime(9257):     at hu.mycomp.myapp.modul.RegattaUnit$1.createFromParcel(RegattaUnit.java:110)
    04-27 12:54:23.021: E/AndroidRuntime(9257):     at android.os.Parcel.readParcelable(Parcel.java:2252)
    04-27 12:54:23.021: E/AndroidRuntime(9257):     at android.os.Parcel.readValue(Parcel.java:2152)
    04-27 12:54:23.021: E/AndroidRuntime(9257):     at android.os.Parcel.readArrayMapInternal(Parcel.java:2485)
    04-27 12:54:23.021: E/AndroidRuntime(9257):     at android.os.BaseBundle.unparcel(BaseBundle.java:221)
    04-27 12:54:23.021: E/AndroidRuntime(9257):     at android.os.BaseBundle.getString(BaseBundle.java:918)
    04-27 12:54:23.021: E/AndroidRuntime(9257):     at hu.mycomp.myapp.service.GpsService.onStartCommand(GpsService.java:117)
    04-27 12:54:23.021: E/AndroidRuntime(9257):     at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:2894)
    04-27 12:54:23.021: E/AndroidRuntime(9257):     ... 9 more

【问题讨论】：

    标签： java android android-intent arraylist parcelable


    【解决方案1】：

    与其将null 作为第二个参数传入readList()，不如传入具有RaceUnit 的ClassLoader。如果RegattaUnit 和RaceUnit 都在同一个应用程序和DEX 文件中，getClass().getClassLoader() 或RaceUnit.class.getClassLoader() 应该可以工作。

    （现在我想知道帆船赛的 SI 单位实际上是什么...... :-)

    【讨论】：

    • 好的@commonsware，但是如果我的类中没有任何属性列表怎么办，只有原始数据类型并且仍然出现与 Adam 相同的错误
    • @AlexSanchez：我建议您提出一个新的 Stack Overflow 问题，在其中提供 minimal reproducible example，以及您的代码和堆栈跟踪。
    • Here 是您建议的问题。
    【解决方案2】：

    它说 classNotFoundException，所以 RaceDayUnit 类可能不在你的类路径中。检查 hu.mycomp.myapp.modul 包是否在您的源包中？

    【讨论】：

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