MuleSoft latest launch Mule 4 offers some interesting integration solutions for businesses at a low cost and simplified way, compared to its prior version Mule 3 release. Migrating from Mule 3 to Mule 4 should be carried out with utmost care. So to assist businesses in secured migration process here we discuss in detail on how to conduct migration process from Mule 3 to Mule 4
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3. Measures to Understand Prior to Migration
Process
Data is crucial Don’t rush it
Encryption and
Decryption.
Understand the
framework
Prepare
Automated Test
Framework.
Did you made
security policies
4. Deciding On When to Go for Mule 3 To
Mule 4 Migration
• Organizationalreadiness
• Are MuleSoftexpertsfully trained and skilled in using Mule 4?
• Learn howthe componentsworkin Mule 4 to see what has changed
fromMule 3
• Is yourorganization willing to keep all MuleSoftsupported
applicationsup to date with Mule 4 upgrades?
• Is Mule 3 and its variantslicense expiring?
• Is customer/clientwantingto upgradeall their applicationsto Mule
4?
• Environmentsetup for migration
5. Mule4 Vs Mule3 Release,Why
Upgrade?
• Integrated and Effective Error handling
• Better Application Configuration: Maven
• Simplified Event Processing and
Messaging
• DataWeave 2.0 For Better Data Handling
6. Conducting
Mule 3 to
Mule 4
Migration
Process
Migrate Patterns
Migrate Water marks
Migrate Core components
Migrate Connectors
Custom Connector from 3.x to 4.x
7. Migrate Patterns
Migrate message properties
Invocation Properties
Invocation properties are now called variables in Mule 4. Behavior is exactly the same as in
Mule 3.
Inbound Properties, Outbound Properties, Inbound and Outbound Attachments
These scopes do not exist in Mule 4.
Migration re-connection strategies - reconnection hasn’t changed much between Mule 3 and Mule 4
In Mule 3, reconnection strategies were specified on each connector’s config element. These strategies had
two purposes:
> To reconnect when a running application looses connection to an endpoint
> To validate all connections when the application is being deployed.
In Mule 4 you can simply specify if deployment should fail or not if connectivity testing fails
12. MuleSoft
Connector
Migration
from 3.x to 4.x
MuleSoft connector architectureis completely
changed in Mule 4.x. In Mule 3.x.
Dev-Kit is used to develop the connector.
In Mule 4, it is based on Mule4 SDK.
Here each processor displayed as a separate
connector in Anypoint Studio Pallet.
13. To Migrate
the connector
to Mule 4,
you can use
conversion
tool
Enable the Connector
as Mule 4 extensionin
pom file
Modify Package element:
<packaging>
mule-extension
</packaging>
Modify parent element
< parent>
<groupId>org.mule.extensions</groupId>
<artifactId>mule-modules-
parent</artifactId>
<version>1.0.0</version>
</parent>
Modify the Folder structure
The typical folder structure
for Mule 4 is
<Module>/api
<Module>/internal
UpdateAnnotations
and ParamsClasses
Delete/Add/UpdateClasses based
on Mule 4 SDK (Please refer Java
Docs)
14. Your Best
Friend in
MIGRATION!
• https://docs.mulesoft.com/mule-
runtime/4.2/migration-process
• https://docs.mulesoft.com/mule-
runtime/4.2/migration-dataweave
• https://docs.mulesoft.com/mule-
runtime/4.2/migration-mel
Migration Documentation
• https://docs.mulesoft.com/mule-
runtime/4.2/migration-prep
Migration Preparation
• https://docs.mulesoft.com/mule-
runtime/4.2/migration-cheat-sheet
Mule 3 to Mule 4 migration cheat sheet
15. Your Best
Friend in
MIGRATION!
• https://docs.mulesoft.com/mule-runtime/4.2/migration-process
• https://docs.mulesoft.com/mule-runtime/4.2/migration-
dataweave
• https://docs.mulesoft.com/mule-runtime/4.2/migration-mel
Migration Documentation
• https://docs.mulesoft.com/mule-runtime/4.2/migration-prep
Migration Preparation
• https://docs.mulesoft.com/mule-runtime/4.2/migration-cheat-
sheet
Mule 3 to Mule 4 migration cheat sheet