A2A Connector 1.1 XML and Maven Support

Although you can manually code a Mule app in XML, it is more efficient to use Anypoint Code Builder or Studio:

If you manually code a Mule runtime engine (Mule) app in XML, either from the Anypoint Code Builder or Studio XML editor, or from a text editor, you can access the connector from your app by adding reference statements to both your XML Mule flow and the Apache Maven pom.xml file.
If you add the connector in Anypoint Code Builder or Studio, the XML is automatically populated the code with the connector’s namespace and schema location and it also adds a dependency to the pom.xml file.

Add a Namespace for the Connector

Paste the following code inside the mule tag of the header of your configuration XML:

http://www.mulesoft.org/schema/mule/a2a
http://www.mulesoft.org/schema/mule/a2a/current/mule-a2a.xsd

This example shows how the namespace statements are placed in the <mule> XML block:

<mule xmlns:a2a="http://www.mulesoft.org/schema/mule/a2a"
	xmlns:ee="http://www.mulesoft.org/schema/mule/ee/core"
	xmlns:http="http://www.mulesoft.org/schema/mule/http"
	xmlns:file="http://www.mulesoft.org/schema/mule/file"
	xmlns="http://www.mulesoft.org/schema/mule/core"
	xmlns:doc="http://www.mulesoft.org/schema/mule/documentation"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://www.mulesoft.org/schema/mule/core
	http://www.mulesoft.org/schema/mule/core/current/mule.xsd
	http://www.mulesoft.org/schema/mule/file
	http://www.mulesoft.org/schema/mule/file/current/mule-file.xsd
	http://www.mulesoft.org/schema/mule/http
	http://www.mulesoft.org/schema/mule/http/current/mule-http.xsd
	http://www.mulesoft.org/schema/mule/ee/core
	http://www.mulesoft.org/schema/mule/ee/core/current/mule-ee.xsd
	http://www.mulesoft.org/schema/mule/a2a
	http://www.mulesoft.org/schema/mule/a2a/current/mule-a2a.xsd">

Add a POM File Dependency

The Apache Maven pom.xml file generated by Anypoint Studio contains dependencies for a Mule app. If you code a Mule app manually, include this XML snippet in your pom.xml file to enable access to this connector:

<dependency>
  <groupId>com.mulesoft.connectors</groupId>
  <artifactId>mule4-a2a-connector</artifactId>
  <version>x.x.x</version>
  <classifier>mule-plugin</classifier>
</dependency>

Replace x.x.x with the version that corresponds to the connector you are using.

To obtain the most up-to-date pom.xml file information:

Go to Anypoint Exchange.
In Exchange, click Login and supply your Anypoint Platform username and password.
In Exchange, search for a2a.
Select the connector.
Click Dependency Snippets near the upper right of the screen.

Update Maven Plugin Version

A2A Connector requires Mule Maven Plugin 4.6.0 or later to support Server-Sent Events (SSE) for streaming operations. Update your project’s pom.xml file to include this version:

<properties>
    <app.runtime>4.9.8</app.runtime>
    <mule.maven.plugin.version>4.6.0</mule.maven.plugin.version>
</properties>

Without this update, you might encounter classloading errors related to org.mule.runtime.http.api.sse.server.SseClient when deploying applications that use streaming features.

Next Step

After completing your namespace and pom.xml file, you can try the Examples.