我正在尝试使用 main 方法将 Java 类中的数据保存在 Firebase 上。但它不起作用。
我阅读了很多帖子,但我无法找到解决方案。
我的代码是:
public static void main(String[] args) throws IOException {
// Init...
//
//
final FirebaseDatabase database = FirebaseDatabase.getInstance();
DatabaseReference ref = database.getReference();
User user = new User("mariano");
CountDownLatch done = new CountDownLatch(1);
ref.child("users").child("3").setValue(user, new
DatabaseReference.CompletionListener() {
@Override
public void onComplete(DatabaseError de, DatabaseReference dr) {
done.countDown();
}
});
try {
done.await();
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println(new App().getGreeting());
}
更新:
如果我尝试使用此代码:
DatabaseReference ref = FirebaseDatabase.getInstance().getReference("blog");
Map<String, User> users = new HashMap<>();
User user = new User("juan");
users.put("user", user);
CountDownLatch done = new CountDownLatch(1);
ref.child("users").setValueAsync(users, new DatabaseReference.CompletionListener() {
@Override
public void onComplete(DatabaseError de, DatabaseReference dr) {
System.out.println("COMPLETEEEE");
done.countDown();
}
});
try {
done.await();
} catch (InterruptedException e) {
e.printStackTrace();
}
代码抛出此错误:
Exception in thread "main" com.google.firebase.database.DatabaseException:
Failed to parse node with class class prueba.App$1
有人建议?帮助?
问候
埃米利亚诺