Moved Smart Client to new server Data Broadcast Fails

Questions
1

I moved my smart client installation (2019.3.0 -releaseNumber 3412) to a new server and data broadcasting is failing and I’m getting some errors in the logs.

2023-11-06 12:06:29,643 ERROR [pool-4-thread-66] ClientManager - Error flushing message buffer to client 326BD240-A151-4F80-87E7-312697B9F56B
java.rmi.RemoteException: Method is not Remote: interface com.servoy.j2db.dataprocessing.IClient::public abstract boolean com.servoy.j2db.dataprocessing.IClient.isAlive() throws java.rmi.RemoteException
at java.rmi.server.RemoteObjectInvocationHandler.invokeRemoteMethod(Unknown Source) ~[?:1.8.0_341]
at java.rmi.server.RemoteObjectInvocationHandler.invoke(Unknown Source) ~[?:1.8.0_341]
at com.sun.proxy.$Proxy43.isAlive(Unknown Source) ~[?:?]
at com.servoy.j2db.server.dataprocessing.ClientProxy.Zc(ClientProxy.java:90) ~[j2dbdev.jar:2019.3.0.3412]
at com.servoy.j2db.server.dataprocessing.Zq.run(Zq.java:11) [j2dbdev.jar:2019.3.0.3412]
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [?:1.8.0_341]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [?:1.8.0_341]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_341]
2023-11-06 12:06:29,643 WARN [pool-4-thread-66] ClientManager - Unregistering client after queueing timeout: 326BD240-A151-4F80-87E7-312697B9F56B

The users are also getting the message:
Reconnect failed
Old transaction,old locks or in-memory data sources found, need to restart the solution

I did restart the solution and the issues are still happening. Any ideas?

2

This was a java issue. We had been using Java 8 91 and the upgraded server had Java 8 341. We downgraded to Java 8 181 and that fixed the issue.

3

Good advice!

So, what’s the latest version of java JRE that works both on a Windows 2019 server and a Mac and PC (smart) client that we can safely run. Surely it must be later than .181 ?

4

I’d either stick with the version that’s shipped with the Servoy developer that you are using or you use the most recent lts version from https://adoptium.net/.

If you need JavaFX for the smart client you could look into Getting Started with JavaFX or use a lts version from Java 8, 11, 17, 21, 23 Download for Linux, Windows and macOS.

We successfully used adoptopenkd / adptium on server and Azul on client when we were using smart clients.