[CAMEL-19199] Unable to start PLC4X route in camel-plc4x

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 3.20.2
• Fix Version/s: 3.20.4, 3.21.0, 4.0-M3, 4.0.0

Environment

Camel core version : 3.20.2 Camel-PLC4X version : 3.20.2

IDE - Eclipse, OS - Windows 10, Java 11

• Estimated Complexity: Unknown
• Assignee: Claus Ibsen
• Reporter: Ghazanfar Ali
• Created: 26/Mar/23 09:13
• Updated: 06/Jun/23 10:20
• Resolved: 27/Mar/23 08:49

Description

I am using ModbusPal to create the Virtual modbus.

I am using the endpoint URI as:

 

plc4x:modbus-tcp://localhost:502?unitId=1&dataType=holding-register&addresses=1

Following is the screenshot of Modbus holding registers:

But when starting camel context it throws NullPointerException.

 

java.lang.NullPointerException
    at org.apache.camel.component.plc4x.Plc4XConsumer.startUnTriggered(Plc4XConsumer.java:89)
    at org.apache.camel.component.plc4x.Plc4XConsumer.doStart(Plc4XConsumer.java:81)
    at org.apache.camel.support.service.BaseService.start(BaseService.java:119) 

I debugged it and found the problem is with this line in PLC4XConsumer line 89:

 

for (Map.Entry<String, Object> tag : tags.entrySet()) {

 

Here tags are null, so it might be that I am not configuring the endpoint correctly.

So, I tried by configuring the endpoint by creating an instance of Plc4XEndpoint and then configuring the tags there, it works like:

Map<String, Object> map = new HashMap<>();
            map.put("value-1", "holding-register:1");
            
            Plc4XEndpoint plc4xEndpoint = new Plc4XEndpoint("plc4x:modbus-tcp://localhost:502",
                    getContext().getComponent("plc4x"));
            plc4xEndpoint.setTags(map);
            from(plc4xEndpoint).log("value : ${body}"); 

But why it is not working if I configure the endpoint as just String?

Note:

I tried with below endpoint and it is also not working:

plc4x:modbus-tcp://localhost:502?tags={unitId=1&dataType=holding-register&addresses=1} 

 

Issue Links

• relates to: CAMEL-19205 camel-plc4x - Make it easier to configure tags in endpoint