RMI using spring. Executing method in server with object as parameter - rmi

Question

I am trying to execute a method from client to server using RMI.
As long as the parameters are String, it is getting executed correctly. If I am using object as method parameter.
I am getting following exception :
java.rmi.UnmarshalException: Error unmarshaling return; nested exception is:
java.lang.ClassNotFoundException: org.eclipse.persistence.exceptions.DatabaseException (no security manager: RMI class loader disabled)
Server configuration:
#Bean
public RmiServiceExporter getUserService() {
RmiServiceExporter exporter = new RmiServiceExporter();
exporter.setService(userService);
exporter.setServiceName("UserService");
exporter.setServiceInterface(UserService.class);
exporter.setRegistryPort(1192);
exporter.setReplaceExistingBinding(true);
return exporter;
}
Client configuration:
public #Bean RmiProxyFactoryBean getUserService() {
RmiProxyFactoryBean rmi = new RmiProxyFactoryBean();
rmi.setServiceInterface(UserService.class);
rmi.setServiceUrl("rmi://localhost:1192/UserService");
return rmi;
}
Test code :
User user = userService.getUser(String userName);
Works perfectly fine.
userService.save(user);
Save user throws RMI exception.
I made sure that the package name for User object in server and client is same. Still I am getting the exception.
Am I missing any configuration? How can I make RMI server to load the other classes?