How to create shared library in mule 4 | MuleSoft Guide

Introduction

When working with MuleSoft, it’s really helpful to use common libraries. These libraries are like toolboxes. They have all the components we often need for different projects. This includes flows and other parts. They make our work easier and help us keep things organized. This guide will show you how to make and look after these libraries. We’ll also see how to share them with others using Anypoint Exchange and similar tools.

Preparing Your Development Environment

The journey begins with the preparation of your development environment. The essential components include:

• JDK: This is an essential precondition for Mule because Mule depends on the Java Development Kit (JDK).
• Anypoint-Studio: The MuleSoft IDE simplifies the processes involved in developing, testing, and deploying Mule applications.

Detailed Guide

With Anypoint Studio, you can start making your own Mule app:

• Workspace Configuration: Define a workspace in Anypoint Studio to store your project files.
• Project Initialization: Create a new project by navigating to File > New > Mule Project, naming your project (e.g., “mail-notification-utility”), selecting a Mule runtime version, and clicking ‘Finish’.

Designing and Implementing the Flow

Mule applications are built using flows, which are sequences of steps that process messages. Anypoint Studio has a user-friendly interface that lets you easily drag and drop parts into your flow from Mule Palette.

In this example, I followed these steps to send an email:

• I used a sub-process.
• I created a custom email template.
• I formatted the email body using HTML with the help of parse template.
• Finally, I used the mail connector ‘send’ feature with SMTP to send the emails to the intended recipients.

Incorporating Components and Managing Dependencies

When you add a component from the Mule Palette to your flow, Anypoint Studio handles the dependencies automatically:

• Automatic Dependency Management: The IDE adds the necessary dependencies to the pom.xml file, which is located in the root directory of your Mule project.
• Manual Dependency Addition: If required, you can manually add dependencies by editing the pom.xml file, specifying the groupId, artifactId, and version.

Once the development phase is finalized, its necessary to deploy the updates to the Exchange. To accomplish this, the following modifications are required.

Changes in POM.xml

• Plugin:  To add a mule-plugin under the  tag in your Maven pom.xml file, you can structure it like this:

<build>  .   .  

  <plugins>

    <plugin>

      <groupId>org.mule.tools.maven</groupId>

      <artifactId>mule-maven-plugin</artifactId>

      <version>${mule.maven.plugin.version}</version>

      <extensions>true</extensions>

      <configuration>

        <classifier>mule-plugin</classifier>

      </configuration>

    </plugin>

  </plugins>

</build>

Note: The  value should be adjusted according to your specific requirements. For instance, if you are developing a plugin, the value would be mule-plugin. Conversely, if you are working on an application, it should be set to mule-application. In my particular scenario, I have used mule-plugin.

Configure Distribution Management

To add a distributionManagement tag under the root project tag in your Maven pom.xml file, you can follow this structure:

<project>  

. .  

  <distributionManagement>

    <repository>

      <id>exchange</id>

      <name>Exchange Private Repository</name>

      <url>https://maven.anypoint.mulesoft.com/api/v1/organizations/${project.groupId}/maven</url>

      <layout>default</layout>

    </repository>

  </distributionManagement> 

    .  .

  </project>

Ensure that the url, name, and id are changed to the correct values for your repository.This tag is typically used to specify where your projects artifacts should be deployed after the build is complete. url is mostly safe for mule apps.

Note: The project.groupId in your Maven configuration must match the Organization ID. This ID is also known as the Business Group ID, where you intend to deploy your connector.

1. Add Credentials

To configure your Anypoint Platform credentials, you will need to update the settings.xml file. This file can typically be found in the .m2 directory within your user profile. Heres how you can locate and edit it:

• Launch Windows Explorer and navigate to the File Explorer.
• Go to the directory that follows: The path C:\Users\\.m2.
• Replace with your actual Windows username.
• Once you are in the .m2 directory, look for the settings.xml file and open it with a text editor.
• Insert your Anypoint Platform credentials in the appropriate sections of the file.

Note: The path to the settings.xml file is dynamic and will vary based on the individual users Windows account name.

Heres how you can add the server details to your settings.xml file for both user credentials and connected app credentials:

<settings>

  <servers>

    <server>

      <id>exchange</id>

      <username>anypoint-platform-user-id</username>

      <password>anypoint-platform-user-password</password>

    </server>

  </servers>

  <servers>

    <server>

      <id>exchange</id>

      <username>~~~Client~~~</username>

      <password>clientid~?~clientsecret</password>

    </server>

  </servers>

</settings>

• Instructions:
• Open the settings.xml file located in your .m2 directory.
• Copy and paste the above XML snippets into your settings.xml file.
• Replace anypoint-platform-user-id and anypoint-platform-user-password with your actual Anypoint Platform user credentials.
• For connected app credentials, replace ~~~Client~~~ with your client ID and clientid~?~clientsecret with your actual client ID and client secret, separated by a tilde (~).

Example: 0894-cqrwr-srwrrtre- fc454-dd~?~xfew-43xwe3-343cft-yt65trc.

Note: Ensure that you place these server details within the root  tag of your settings.xml file.

its crucial to ensure that the  tag in your settings.xml file matches the  tag in the distributionManagement section of your pom.xml file. This is because Maven uses the  to associate the server configuration in settings.xml with the repository defined in pom.xml. Heres how you can ensure they match:

1. In settings.xml:

<servers>

  <server>

    <id>exchange</id>

  </server>

</servers>

• In pom.xml:

<distributionManagement>

  <repository>

    <id>exchange</id>

  </repository>

</distributionManagement>

Remember:

• The  value exchange is used as an example. You should use the  that corresponds to your specific configuration.
• The  must be the same in both files to correctly link the server settings with the repository configuration.

By following this guideline, Maven will be able to authenticate with the repository. It will interact using the credentials provided in the settings.xml when you perform deployments or releases.

• Deploying the Connector
• After successfully develop the application , open the command prompt.
• Navigate to your projects root directory using the cd command.
• Run the Maven command below to deploy the connector into exchange:

mvn deploy

• Upon successful deployment, your connector will be available and listed in the Anypoint Exchange.

Conclusion

Developing custom connectors is a powerful way to enhance the functionality of MuleSoft and achieve seamless integration with unique systems. Adhering to the outlined procedures enables you to construct, deploy, and distribute your specialized Mule common library connector with efficiency. Its crucial to meticulously document your connector and offer precise usage guidelines on Anypoint Exchange. Wishing you successful integrations!