RMI code fails with "NoClassDefFoundError: java/sql/Timestamp" migrating to OpenJDK21

Issue

• RMI code fails migrating from OpenJDK8 to OpenJDK21:

   java.rmi.ServerError: Error occurred in server thread; nested exception is:
        java.lang.NoClassDefFoundError: java/sql/Timestamp
        sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:389)
        sun.rmi.transport.Transport$1.run(Transport.java:200)
        sun.rmi.transport.Transport$1.run(Transport.java:197)
        java.security.AccessController.doPrivileged(AccessController.java:714)
        sun.rmi.transport.Transport.serviceCall(Transport.java:196)
        sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:598)
        sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:844)
        sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:721)
        java.security.AccessController.doPrivileged(AccessController.java:400)
        sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:720)
        java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
        java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
        java.lang.Thread.run(Thread.java:1583)
        sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:304)
        sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:280)
        sun.rmi.server.UnicastRef.invoke(UnicastRef.java:382)
        sun.rmi.registry.RegistryImpl_Stub.rebind(RegistryImpl_Stub.java:158)
        com.example.MyClass.createRMIConnection(MyClass.java:364)
        com.example.MyClass.init(MyClass.java:318)
...