Registration error: no-argument constructor not found

Troubleshooting spidermonkey
1

I am trying to create a server for my game but everytime I run it, it throws off this error (See title). It points here:
Serializer.registerClass(connected.class);

Here is connected.class:
@Serializable
public class connected extends AbstractMessage {
public connected() {} // empty constructor
}

Any ideas on how to fix it? I am running only the code from the wiki page for spidermonkey but this error always appears. Thanks for all your help!

2

Here is the full error:
SEVERE: Uncaught exception thrown in Thread[Headless Application Thread,5,main]
java.lang.RuntimeException: Registration error: no-argument constructor not found on:class Server.Server$connected
at com.jme3.network.serializing.serializers.FieldSerializer.checkClass(FieldSerializer.java:57)
at com.jme3.network.serializing.serializers.FieldSerializer.initialize(FieldSerializer.java:63)
at com.jme3.network.serializing.Serializer.registerClassForId(Serializer.java:179)
at com.jme3.network.serializing.Serializer.registerClass(Serializer.java:207)
at com.jme3.network.serializing.Serializer.registerClass(Serializer.java:148)
at Server.Server.simpleInitApp(Server.java:41)
at com.jme3.app.SimpleApplication.initialize(SimpleApplication.java:226)
at com.jme3.system.NullContext.initInThread(NullContext.java:84)
at com.jme3.system.NullContext.run(NullContext.java:127)
at java.lang.Thread.run(Thread.java:722)

3

“no-argument constructor not found on:class Server.Server$connected”

It’s because it’s not a static inner class. When you have a non-static inner class then there is a hidden parameter to the outer instance since you cannot instantiate a non-static inner class without having an instance of the outer class.

Make the class static or break it out into its own class. The latter is probably a safer idea since you will need this exact same class available on both client and server… registered in the EXACT same order.

1 Like
4

Sorry if this is an idiotic question but what do you mean by ‘‘breaking the class out’’?

5

Also, thanks so much for your answer! By setting the class as static, it works beautifully now! I still wonder what you meant with the latter solution though.

6

he meant,: put it in a own file as public class