---
title: "Post Message Steps"
slug: "post-message-steps"
updated: 2023-01-05T21:32:07Z
published: 2023-01-05T21:32:07Z
canonical: "documentation.decisions.com/post-message-steps"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://documentation.decisions.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Post Message

| ## Step Details |
| --- |
| **Introduced in Version** | 3.0.0 |
| **Last Modified in Version** | 8.0.0 |
| **Location** | Integration > Message Queues |

The Post Message Step sends a message to the selected queue defined on the SETTINGS for the step. The Queue Name can be selected from the drop-down menu, or provided as part of a [Message Queue Handler Flow](https://documentation.decisions.com/docs/setting-up-messaging-overview). The message will be sent as a list of encoded bytes.

---

#### Inputs

| Property | Description | Data Type |
| --- | --- | --- |
| Always Override ID (Even if Null or Empty) | If enabled, the sent message ID will always be overwritten, even if no value is sent. | Boolean |
| Message Body | The body of the message. The message body will be a list of encoded bytes sent to the queue | List of Byte |
| Override Message Id | The defined value used when overriding the message ID | String |

#### Outputs

| Property | Description | Data Type |
| --- | --- | --- |
| Message Id | The message ID returned for tracking purposes in the queue | --- |

#### Settings

| Property | Description | Data Type |
| --- | --- | --- |
| Queue Name | The name of the selected Queue | String |
| Get Queue From Flow | Retrieves the queue name from the Flow. | String |

---

## Example Inputs and Outputs

| Always Override Id (Even if Null or Empty) | Message Body | Override Message Id | Output |
| --- | --- | --- | --- |
| False | YWJjDQpkZWYNCmdoaSAgIA0Kamts | False | Message Id: 08dadf96-196b-42aa-c360-f149cc047f0d |
| False | YWJjDQpkZWYNCmdoaSAgIA0Kamts | ABC123 | Message Id: ABC123 |
| True | YWJjDQpkZWYNCmdoaSAgIA0Kamts | NULL | Message Id: NULL |

![](https://cdn.document360.io/6ef8bcc1-6489-4486-9ad1-83acff7e5df0/Images/Documentation/image-1671217341282.png)

---

## Common Errors

### Missing Queue selection

If a [message queue](https://documentation.decisions.com/docs/about-messaging) is not selected under the SETTINGS category for the step, the step will throw an error. Ensure that a queue has been selected before running the step.

```cpp
Exception Stack Trace: DecisionsFramework.Design.Flow.ErrorRunningFlowStep: Error running step Post Message 1[PostMessage] in flow [Testing]: Object reference not set to an instance of an object. ---> System.NullReferenceException: Object reference not set to an instance of an object.
   at DecisionsFramework.Data.Messaging.MessageServerEndpoint.GetQueueByName(String queueName)
   at DecisionsFramework.Data.Messaging.MessagingService.GetQueueByName(String queueName)
   at DecisionsFramework.Data.Messaging.BaseMessagingStep.GetQueue(StepStartData stepData)
   at DecisionsFramework.Data.Messaging.PostMessage.Run(StepStartData data)
   at DecisionsFramework.Design.Flow.FlowStep.RunStepInternal(String flowTrackingID, String stepTrackingID, KeyValuePairDataStructure[] stepRunDataValues, AbstractFlowTrackingData trackingData)
   at DecisionsFramework.Design.Flow.FlowStep.Start(String flowTrackingID, String stepTrackingID, FlowStateData data, AbstractFlowTrackingData trackingData, RunningStepData currentStepData) 
   --- End of inner exception stack trace ---
```

---

Related Information

Forum Posts:

- [Kafka Queue - Retrieving Most Messages](https://support.decisions.com/forum/topic2856-kafka-queue--retrieving-multiple-messages.aspx)
- [SQS Messaging](https://support.decisions.com/forum/topic24489-sqs-messaging.aspx)