Java 将对象保存到firebase db时出现意外错误？（mClassMapper.access$200（com.google.firebase:firebase数据库@@16.0.5:47））

我得到的错误日志（其中的一部分）：

mClassMapper.access$200(com.google.firebase:firebase-database@@16.0.5:47)
    at com.google.firebase.database.core.utilities.encoding.CustomClassMapper$BeanMapper.serialize(com.google.firebase:firebase-database@@16.0.5:663)
    at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.serialize(com.google.firebase:firebase-database@@16.0.5:167)
    at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.access$200(com.google.firebase:firebase-database@@16.0.5:47)
    at com.google.firebase.database.core.utilities.encoding.CustomClassMapper$BeanMapper.serialize(com.google.firebase:firebase-database@@16.0.5:663)
    at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.serialize(com.google.firebase:firebase-database@@16.0.5:167)
    at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.access$200(com.google.firebase:firebase-database@@16.0.5:47)
    at com.google.firebase.database.core.utilities.encoding.CustomClassMapper$BeanMapper.serialize(com.google.firebase:firebase-database@@16.0.5:663)
    at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.serialize(com.google.firebase:firebase-database@@16.0.5:167)
    at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.access$200(com.google.firebase:firebase-database@@16.0.5:47)
    at com.google.firebase.database.core.utilities.encoding.CustomClassMapper$BeanMapper.serialize(com.google.firebase:firebase-database@@16.0.5:663)
    at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.serialize(com.google.firebase:firebase-database@@16.0.5:167)
    at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.access$200(com.google.firebase:firebase-database@@16.0.5:47)
    at com.google.firebase.database.core.utilities.encoding.CustomClassMapper$BeanMapper.serialize(com.google.firebase:firebase-database@@16.0.5:663)
    at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.serialize(com.google.firebase:firebase-database@@16.0.5:167)`2019-01-03 11:48:45.070 28064-28064/com.example.xandi.whib E/AndroidRuntime:     at com.google.firebase.database.core.utilities.encoding.CustomClassMapper$BeanMapper.serialize(com.google.firebase:firebase-database@@16.0.5:663)
    at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.serialize(com.google.firebase:firebase-database@@16.0.5:167)
    at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.access$200(com.google.firebase:firebase-database@@16.0.5:47)
    at com.google.firebase.database.core.utilities.encoding.CustomClassMapper$BeanMapper.serialize(com.google.firebase:firebase-database@@16.0.5:663)
    at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.serialize(com.google.firebase:firebase-database@@16.0.5:167)
    at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.access$200(com.google.firebase:firebase-database@@16.0.5:47)
    at com.google.firebase.database.core.utilities.encoding.CustomClassMapper$BeanMapper.serialize(com.google.firebase:firebase-database@@16.0.5:663)
    at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.serialize(com.google.firebase:firebase-database@@16.0.5:167)
    at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.access$200(com.google.firebase:firebase-database@@16.0.5:47)
    at com.google.firebase.database.core.utilities.encoding.CustomClassMapper$BeanMapper.serialize(com.google.firebase:firebase-database@@16.0.5:663)
    at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.serialize(com.google.firebase:firebase-database@@16.0.5:167)
    at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.access$200(com.google.firebase:firebase-database@@16.0.5:47)
    at com.google.firebase.database.core.utilities.encoding.CustomClassMapper$BeanMapper.serialize(com.google.firebase:firebase-database@@16.0.5:663)
    at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.serialize(com.google.firebase:firebase-database@@16.0.5:167)
    at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.access$200(com.google.firebase:firebase-database@@16.0.5:47)
    at com.google.firebase.database.core.utilities.encoding.CustomClassMapper$BeanMapper.serialize(com.google.firebase:firebase-database@@16.0.5:663)
    at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.serialize(com.google.firebase:firebase-database@@16.0.5:167)
    at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.access$200(com.google.firebase:firebase-database@@16.0.5:47)
    at com.google.firebase.database.core.utilities.encoding.CustomClassMapper$BeanMapper.serialize(com.google.firebase:firebase-database@@16.0.5:663)
    at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.serialize(com.google.firebase:firebase-database@@16.0.5:167)
    at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.access$200(com.google.firebase:firebase-database@@16.0.5:47)
    at com.google.firebase.database.core.utilities.encoding.CustomClassMapper$BeanMapper.serialize(com.google.firebase:firebase-database@@16.0.5:663)
    at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.serialize(com.google.firebase:firebase-database@@16.0.5:167)
    at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.access$200(com.google.firebase:firebase-database@@16.0.5:47)
    at com.google.firebase.database.core.utilities.encoding.CustomClassMapper$BeanMapper.serialize(com.google.firebase:firebase-database@@16.0.5:663)
    at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.serialize(com.google.firebase:firebase-database@@16.0.5:167)
    at com.google.firebase.database.core.utilities.encoding.CustomClassMapper.access$200(com.google.firebase:firebase-database@@16.0.5:47)
    at com.google.firebase.database.core.utilities.encoding.CustomClassMapper$BeanMapper.serialize(com.google.firebase:firebase-database@@16.0.5:663)

read: unexpected EOF!

`

下面是我尝试做的代码：

private void createNewGroup(int i) {
    List<String> userUIDList = new ArrayList<String>();
    userUIDList.add(Util.getUser().getUserUID());
    List<User> users = new ArrayList<>();
    users.add(Util.getUser());
    GroupTempInfo groupTempInfo = new GroupTempInfo(users, false);
    Group group = new Group(UUID.randomUUID().toString(), comment.getSubject().getSubjectUID(), i, Util.getServer().getTempInfo().getNumber(),
            groupTempInfo, "text", new ArrayList<Question>(), userUIDList,
            new ArrayList<Participation>(), false, comment);
    comment.setCommentGroup(group);
    Util.mServerDatabaseRef.child(Util.getServer().getType()).child(Util.getServer().getServerUID()).child("timeline").child("commentList").child(comment.getCommentUID()).child("commentGroup").setValue(group);
    sendNotification();
}

private void createNewGroup（int i）{
List userUIDList=new ArrayList（）；
添加（Util.getUser（）.getUserUID（））；
列表用户=新建ArrayList（）；
添加（Util.getUser（））；
GroupTempInfo GroupTempInfo=新的GroupTempInfo（用户，false）；
Group Group=新组（UUID.randomUUID（）.toString（），comment.getSubject（）.getSubjectId（），i，Util.getServer（）.getTempInfo（）.getNumber（），
groupTempInfo，“文本”，新ArrayList（），userUIDList，
新建ArrayList（），false，注释）；
comment.setCommentGroup（组）；
Util.mServerDatabaseRef.child（Util.getServer（）.getType（））.child（Util.getServer（）.getServerUID（））.child（“时间线”）.child（“评论列表”）.child（comment.getCommentUID（））.child（“评论组”）.setValue（组）；
发送通知（）；
}

这是我在db firebase上的结构。我只是想在“commmentList”中添加一个对象

我在编译时没有发现任何错误，只是在logcat上

---

有人知道问题出在哪里吗？

此错误的原因是我试图在另一个对象内设置一个对象，其中第一个对象有第一个对象，而de first对象有第二个对象：

---

“Comment”的属性是“Group”，而“Group”的属性是“Comment”

当我试图将

Uri

对象放入数据库时，发生了此错误。我用

String

表示

Uri

来解决这个问题。

这解决了我的问题。我在Uri的末尾添加了.toString（），并添加了。一切正常。@Eaweb yass，确切地说：）但是，为什么firebase实时数据库无法持久化android.net.Uri？@Pavan

Uri

不是firebase支持的本机类型之一。你可以在这里查看哇！你是救生员：）