How do I set a custom class in a java function signature?

[AcNas]

Good afternoon. I try to pass a custom class to the function signature, but the debugger writes that it can't find it and the function is not executed. What am I doing wrong?
example.java

package ru.acnas;

import java.util.ArrayList;

class ADevices extends ArrayList<Integer> {
   boolean _add(int val){return add(val);}
}
public class Example
{
   public void setDevices(ADevices  devices){}
}

main.cpp

#include <QAndroidJniObject>
#include <QAndroidJniEnvironment>
#include <QtAndroid>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QAndroidJniObject search("ru.acnas.Example")
    QAndroidJniObject test("ru.acnas.ADevices");
    search.callMethod<void>("setDevices", "(Lru.acnas.ADevices;)V", test.object());
    return a.exec();
}

debugger

W System.err: java.lang.NoSuchMethodError: no non-static method "Lru/acnas/Example;.setDevices(Lru.acnas.ADevices;)V"
W System.err: 	at org.qtproject.qt5.android.QtNative.startQtApplication(Native Method)
W System.err: 	at org.qtproject.qt5.android.QtNative$7.run(QtNative.java:620)
W System.err: 	at org.qtproject.qt5.android.QtThread$1.run(QtThread.java:61)
W System.err: 	at java.lang.Thread.run(Thread.java:923)