Basic RPC Gateway-Client gives "Module Not Found"

Hi there…

I am trying to get basic RPC functionality from the client to the gateway.

I have setup my RPC code as set out in the Programmers guide :thumb_right: .

In both projects (client, gateway) there is a copy of the ModuleRPC interface.

[code]package com.versata.gblocks.common;

public interface ModuleRPC {
String getGreeting(String firstName);

In the Gateway project is the implementation:

[code]package com.versata.gblocks.gateway;

import com.versata.gblocks.common.ModuleRPC;

public class ModuleRPCImpl implements ModuleRPC {
public String getGreeting(String firstName){
return "Hello, " + firstName;


In the Gateway hook:

[code]package com.versata.gblocks.gateway;

import com.inductiveautomation.ignition.common.licensing.LicenseState;
import com.inductiveautomation.ignition.gateway.clientcomm.ClientReqSession;
import com.inductiveautomation.ignition.gateway.model.AbstractGatewayModuleHook;
import com.inductiveautomation.ignition.gateway.model.GatewayContext;

public class GatewayHook extends AbstractGatewayModuleHook {

public void setup(GatewayContext context) {
	// TODO Write code, override methods as needed


public void shutdown() {


public void startup(LicenseState licenseState) {

public Object getRPCHandler(ClientReqSession session, Long projectId) {      
	return new ModuleRPCImpl();   


In the client code at the end of the constructor:

ModuleRPC rpc = ModuleRPCFactory.create("com.versata.gblocks.gateway.ModuleRPCImpl'", ModuleRPC.class); System.out.println( rpc.getGreeting("Bill") );

However in the Designer I get the following compact error:

[quote]SerializationException: Error deserializing element “<c”
caused by UndeclaredThrowableException
caused by GatewayException: Module “com.versata.gblocks.gateway.ModuleRPCImpl’” not found.
caused by IllegalArgumentException: Module “com.versata.gblocks.gateway.ModuleRPCImpl’” not found.

I copied the example directly but then was getting an error with the code from the example:

ModuleRPC rpc = ModuleRPCFactory.create(ModuleMeta.MODULE_ID, ModuleRPC.class); System.out.println( rpc.getGreeting("Bill") );
Where it complained about the function getGreeting(String)not existing in an alarm module com.inductiveautomation.alarm-notification :scratch: .

So I changed the code to the implementation given first.

Is there anything obvious I have missed.

I just want to finish setting up the basics, so I can move on to the nitty gritty :/ .

Any help will be appreciated :prayer: .

It looks like you’ve got a single quote character that doesn’t belong in the moduleId String in your call to create the ModuleRPC instance.

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