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Anypoint MQ Connector Release Notes for Mule 4

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Anypoint Connector for Anypoint MQ (Anypoint MQ Connector) enables you to add messaging access to Anypoint MQ queues and exchanges from Anypoint Studio applications.

Anypoint MQ Connector versions 4.x, 3.x, and 2.x work only with Mule 4.x and Studio 7.x.

Anypoint MQ Connector version 3.x receives updates for bug fixes and security patches only. For the latest features and enhancements, upgrade your connector to the latest 4.x version.

Guide: Anypoint MQ Connector User Guide

4.0.23

August 26, 2026

What’s New

  • The Anypoint MQ subscriber now recovers automatically from a broker connectivity loss. Previously, if connectivity dropped during message acknowledgement, the subscriber could stop consuming and remain stopped until the Mule application was restarted. The subscriber now implements the runtime’s reconnection contract and re-establishes its connection per the configured reconnection strategy, resuming consumption without manual intervention.

Compatibility

Software Version

Mule

4.1.0 and later

OpenJDK

8, 11, and 17

4.0.22

August 17, 2026

What’s New

  • The internal Anypoint MQ REST client is upgraded to a build that declares its Apache-2.0 license in the artifact POM. Earlier builds published without a license declaration, which caused some dependency scanners (for example, JFrog Xray) to quarantine the artifact as unknown license. There is no functional or behavioral change to the connector.

Compatibility

Software Version

Mule

4.1.0 and later

OpenJDK

8, 11, and 17

4.0.21

July 21, 2026

What’s New

  • The internal Anypoint MQ REST client is upgraded to a spring-core-free build to address reported security vulnerabilities (CVE-2025-41249 and CVE-2024-38816). Retry and backoff behavior is unchanged.

Compatibility

Software Version

Mule

4.1.0 and later

OpenJDK

8, 11, and 17

4.0.20

July 8, 2026

What’s New

  • The polling strategy for the Subscriber source now supports backpressure, which paces message retrieval to match your flow’s processing capacity. When enabled, the Subscriber source fetches new messages only when capacity is available and releases capacity when a message finishes processing. Backpressure is opt-in and disabled by default. To enable it, set the anypoint.mq.subscriber.backpressure.enabled system property to true. For more information, see Backpressure and Max Concurrency.

Compatibility

Software Version

Mule

4.1.0 and later

OpenJDK

8, 11, and 17

4.0.16

May 20, 2026

Fixed Issues

Issue Resolution ID

A packaging defect introduced in 4.0.15 that caused applications to fail to deploy with a class loader error is now resolved. This version includes the same vulnerability fixes as 4.0.15.

W-22553120

Compatibility

Software Version

Mule

4.1.0 and later

OpenJDK

8, 11, and 17

4.0.15 (Deprecated)

May 19, 2026

This version is deprecated. Upgrade to 4.0.16.

Known Issues

Known Issue Workaround ID

Applications fail to deploy with java.lang.IllegalStateException and NoSuchFileException: …​/META-INF/maven. The consumable artifact published to Exchange contains a malformed pom.xml. The source in Nexus isn’t affected.

Upgrade to 4.0.16.

W-22553120

4.0.14

October 20, 2025

What’s New

  • Anypoint MQ Connector and MQ REST client licensing information is updated to CPAL v2.0.

Compatibility

Software Version

Mule

4.1.0 and later

OpenJDK

8, 11, and 17

4.0.13

May 29, 2025

Compatibility

Software Version

Mule

4.1.0 and later

OpenJDK

8, 11, and 17

Fixed Issues

Issue Resolution ID

Anypoint MQ Connector upgrades dependencies to address reported security vulnerabilities (CVE-2024-38808 and CVE-2023-20863).

W-17873558

OAuth token calls now include a requestId to improve tracking and debugging of authentication requests.

W-18343528

Buffer is full, skipping message fetch errors no longer occur when using the Anypoint MQ Connector with prefetch=1 and maxConcurrency=1. Previously, these settings caused message consumption to stop until the application restarted, because competing processes held the buffer resource without releasing it.

W-15572531

Anypoint MQ subscriber throughput now improves when using prefetch=1 and maxConcurrency=1. Previously, message consumption slowed under these settings, reducing overall processing performance.

W-15513498

4.0.12

November 13, 2024

What’s New

  • The commons-io library is upgraded to version 2.14.0 to address reported security vulnerabilities (CVE-2024-47554).

Compatibility

Software Version

Mule

4.1.0 and later

OpenJDK

8, 11, and 17

Fixed Issues

Issue Resolution ID

To facilitate troubleshooting, Anypoint MQ Connector now logs the lock ID by default when receiving messages.

W-16770759

The commons-io library is upgraded to version 2.14.0 to address reported security vulnerabilities (CVE-2024-47554).

W-16984485

4.0.11

September 20, 2024

Compatibility

Software Version

Mule

4.1.0 and later

OpenJDK

8, 11, and 17

Fixed Issues

Issue Resolution ID

A concurrency issue that sometimes caused the Subscriber to throw a NullPointerException error while calling the Destination.getName() method no longer occurs.

W-16600995

4.0.10

August 16, 2024

Compatibility

Software Version

Mule

4.1.0 and later

OpenJDK

8, 11, and 17

Fixed Issues

This release includes only non-user-impacting changes.

4.0.9

August 12, 2024

What’s New

  • Anypoint MQ Subscriber performance is improved.

Compatibility

Software Version

Mule

4.1.0 and later

OpenJDK

8, 11, and 17

4.0.8

June 10, 2024

What’s New

  • The com.google.guava:guava 30.0-jre library is upgraded to version 32.0.1-jre to address reported security vulnerabilities (CVE-2023-2976).

Compatibility

Software Version

Mule

4.1.0 and later

OpenJDK

8, 11, and 17

Fixed Issues

Issue Resolution ID

The com.google.guava:guava 30.0-jre library is upgraded to version 32.0.1-jre to address reported security vulnerabilities (CVE-2023-2976).

W-15695673

4.0.7

May 10, 2024

What’s New

Compatibility

Software Version

Mule

4.1.0 and later

OpenJDK

8, 11, and 17

4.0.6

February 5, 2024

Compatibility

Software Version

Mule

4.1.0 and later

OpenJDK

8, 11, and 17

Fixed Issues

Issue Resolution ID

This connector is now compatible with Java 11.

W-14954942

4.0.5

February 1, 2024

Compatibility

Software Version

Mule

4.1.0 and later

OpenJDK

8 and 17

Known Issues

Known Issue Workaround ID

Beginning with Anypoint MQ Connector version 4.0.4, Anypoint Studio versions (for example, v7.16) configured with Java 11 as the default report that the connector doesn’t support Java 11.

Update the connector to version 4.0.6 or later if you need Java 11 support.

W-14954942

For additional known issue information about this product, see Known Issues.

4.0.4

January 23, 2024

What’s New

  • This connector is now compatible with Java 17.

Compatibility

Software Version

Mule

4.1.0 and later

OpenJDK

8 and 17

Fixed Issues

Issue Resolution ID

The consumer/subscriber no longer recasts integer values to double values when it retrieves the message.

W-13721361

Known Issues

Known Issue Workaround ID

Beginning with Anypoint MQ Connector version 4.0.4, Anypoint Studio versions (for example, v7.16) configured with Java 11 as the default report that the connector doesn’t support Java 11.

Update the connector to version 4.0.6 or later if you need Java 11 support.

W-14954942

For additional known issue information about this product, see Known Issues.

4.0.3

April 19, 2023

Compatibility

Software Version

Mule

4.1.0 and later

OpenJDK

8 and 11

Fixed Issues

Issue Resolution ID

The Spring Framework dependency is updated to 5.0.10 to fix reported security vulnerabilities (CVE-2018-15756).

The com.google.code.gson:gson dependency is updated to 2.8.9 to fix reported security vulnerabilities (CVE-2022-25647).

W-12717888

4.0.2

February 27, 2023

Compatibility

Software Version

Mule

4.1.0 and later

OpenJDK

8 and 11

Fixed Issues

Issue Resolution ID

The connector now correctly supports the / character in messageId.

W-12004936

4.0.1

February 7, 2023

What’s New

Compatibility

Software Version

Mule

4.1.0 and later

OpenJDK

8 and 11

4.0.0

This version is deprecated. The new features for this version are in version 4.0.1.

3.2.6

February 6, 2024

Compatibility

Software Version

Mule

4.1.0 and later

OpenJDK

8, 11, and 17

Fixed Issues

Issue Resolution ID

This connector is now compatible with Java 11.

W-14954942

3.2.5

January 23, 2023

What’s New

  • This connector is now compatible with Java 17.

Compatibility

Software Version

Mule

4.1.0 and later

OpenJDK

8 and 17

Fixed Issues

Issue Resolution ID

The consumer/subscriber no longer recasts integer values to double values when it retrieves the message.

W-13721361

Known Issues

Known Issue Workaround ID

Beginning with Anypoint Connector version 3.2.5, Anypoint Studio versions (for example, v7.16) configured with Java 11 as the default report that the connector doesn’t support Java 11.

Update the connector to version 3.2.6 or later if you need Java 11 support.

W-14954942

For additional known issue information about this product, see Known Issues.

3.2.4

April 19, 2023

Compatibility

Software Version

Mule

4.1.0 and later

OpenJDK

8 and 11

Fixed Issues

Issue Resolution ID

The Spring Framework dependency is updated to 5.0.10 to fix reported security vulnerabilities (CVE-2018-15756).

The com.google.code.gson:gson dependency is updated to 2.8.9 to fix reported security vulnerabilities (CVE-2022-25647).

W-12717888

3.2.3

February 27, 2023

Compatibility

Software Version

Mule

4.1.0 and later

Fixed Issues

Issue Resolution ID

The connector now correctly supports the / character in messageId.

W-12004936

3.2.2 (Deprecated)

This version is deprecated. The fixed issues for this version are in version 3.2.3.

3.2.1 (Deprecated)

This version is deprecated. The fixed issues for this version are in version 3.2.3.

3.2.0

October 12, 2022

What’s New

Compatibility

Software Version

Mule

4.1.0 and later

3.1.7

May 3, 2022

What’s New

  • This release includes security and performance improvements.

Compatibility

Software Version

Mule

4.1.0 and later

3.1.6

January 10, 2022

Compatibility

Software Version

Mule

4.1.0 and later

Fixed Issues

Issue Resolution ID

Message Group ID now correctly supports alphanumeric characters (a-z, A-Z, 0-9) and punctuation (! " # $ % & ' ( ) * + , - . / : ; < = > ? @ [ ] \ ^ _ ` { } | ~).

SE-23324

3.1.5

August 11, 2021

Compatibility

Software Version

Mule

4.1.0 and later

Fixed Issues

Issue Resolution ID

Upgraded the following library dependencies to address security vulnerabilities:

  • com.google.guava:guava upgraded to 30.0-jre.

  • commons-io:commons-io upgraded to 2.7.

  • org.springframework:spring-core upgraded to 5.0.6.RELEASE.

3.1.4

June 14, 2021

Compatibility

Software Version

Mule

4.1.0 and later

Fixed Issues

  • Improved performance by reusing the same connections when all the parameters in dynamic configuration remain the same. (SE-16909)

3.1.3

April 29, 2021

Compatibility

Software Version

Mule

4.1.0 and later

Fixed Issues

  • Fixed an issue with the Anypoint MQ Connector retry and backoff mechanisms. (MQ-2282)

3.1.2

January 21, 2021

Compatibility

Software Version

Mule

4.1.0 and later

Fixed Issues

  • Fixed an issue in which the Anypoint MQ Connector 3.1.1 Subscriber source with a circuit breaker and custom error prevented the app from consuming or processing messages. (SE-18045)

3.1.1

September 11, 2020

Compatibility

Software Version

Mule

4.1.0 and later

Fixed Issues

  • Fixed an issue in which the Anypoint MQ Connector 3.1.0 Subscriber source didn’t consume messages after a network outage. (SE-16793, SE-17007, SE-17206)

3.1.0

October 2, 2019

Compatibility

Software Version

Mule

4.1.0 and later

New Features

  • Added message group ID support for FIFO queues. (MQ-1669)

  • Added support for Delay Queues and Delay Messages. (MQ-1594)

Fixed Issues

  • Resolved an issue that caused a StackOverflowError error when using the connector in a for-each loop to process large amounts of data.

3.0.0

July 29, 2019

Compatibility

Software Version

Mule

4.1.0 and later

New Features

Version 3.0 includes an improved user experience and these new features:

  • All operations are nonblocking.

  • Subscriber source supports Mule Scheduler configurations natively.

  • Polling subscriber type supports throttling.

  • Java 11 is supported.

  • Circuit breaker configuration is simplified.

  • Subscriber source always uses long polling when fetching new messages.

Fixed Issues

This release fixes these issues:

  • Connection validation is ignored. (MQ-1521)

  • Avoid thread starvation on HTTP failures. (MQ-1522)

  • Change all payloads to IS instead of byte[]. (MQ-1394)

  • Consume operation should throw a TIMEOUT error when no message is present. (MQ-1280)

  • Avoid overlapping polls on Subscriber operation with fixed frequency. (MQ-1360)

2.1.0

December 14, 2018

Compatibility

Software Version

Mule

4.0.0 and later

Fixed Issues

  • Duplicated ACK when using IMMEDIATE mode. (MQ-1381)

  • Avoid overlapping polls on fixed-frequency subscriber. (MQ-1360)

  • Use long polling with maximum timeout in the fixed-frequency subscriber. (MQ-1359)

  • Add version information in User-Agent header. (MQ-1339)

New Features

  • Add circuit breaker capabilities to the MQ Subscriber. (MQ-1343)

2.0.5

November 2, 2018

Compatibility

Software Version

Mule

4.0.0 and later

Fixed Issues

  • Update reference docs for Subscriber parameters. (MQ-1340)

  • MQ Subscriber: Needs to shut down gracefully when stopped. (MQ-1338)

  • Anypoint MQ Connector does not remove expired messages from a preserved buffer. (MQ-1333)

  • Anypoint MQ Connector blocks all app I/O threads when invoked concurrently. (MQ-1324)

  • Anypoint MQ Connector prefetch limit is ignored. (MQ-1323)

  • The Subscriber picks up messages very slowly from a queue. (MQ-1322)

  • Messages are being read twice by Anypoint MQ Connector. (MQ-1320)

  • PollingTime is not used by the Subscriber. (MQ-1277)

  • Subscriber prefetch cannot be disabled. (MQ-1276)

2.0.4

September 19, 2018

Compatibility

Software Version

Mule

4.0.0 and later

New Features

This release of Anypoint MQ Connector implements retry logic with exponential backoff.

Fixed Issues

  • Improves logger precision to avoid issues during transaction tracing.

  • Allows Subscriber prefetch to be disabled for predictability on API calls (see Known Issues).

Known Issues

Using prefetch can result in the loss of predictability of API calls. If prefetch is used, Anypoint MQ Connector aggressively tries to fetch messages, which results in increased API calls. If predictability and control on API requests is important, use the following steps to disable prefetch and strictly follow the polling time.

Only disable prefetch if predictability on API calls is more important than performance. Maximum possible performance is only available when prefetch is enabled.

To disable prefetch:

  1. Access a new or existing connector configuration of the MQ Subscriber component.

  2. Navigate to the Prefetch tab.

  3. Specify a Fetch size of 0. This disables prefetch.

  4. In the Studio General tab, specify a Polling time in milliseconds.

    This time interval is strictly adhered to when making API calls. Polling time defaults to 10 seconds if an explicit configuration is not present.

    If there are no messages in the queue, each poll that a subscriber makes waits for the duration of exactly half of the Polling time specified in the General tab. Polling time has a maximum value of 20000 milliseconds.

Note: Versions 2.0.2 - 2.0.3 were internal releases only without changes to the user interface or product usage.

For additional known issue information about this product, see Known Issues.

2.0.1

July 4, 2018

Compatibility

Software Version

Mule

4.0.0 and later

Fixed Issues

  • Internal fix only. No change to the user interface or product usage.

2.0.0

November 17, 2017

New Features

Anypoint MQ Connector adds support for Mule4 and Anypoint Studio 7.

Compatibility

Software Version

Mule

4.0.0 and later

Known Issues

  • Anypoint MQ Connector doesn’t support tracking.

    Example with tracking:

    <flow name="customers-all-get" tracking:enable-default-events="true">
  <anypoint-mq:subscriber config-ref="Anypoint_MQ_Configuration"
  destination="testQueue" acknowledgementMode="AUTO"/>
  <tracking:transaction id="customers-all-get"/>
</flow>

    Example without tracking:

    <flow name="customers-all-get">
  <anypoint-mq:subscriber config-ref="Anypoint_MQ_Configuration"
  destination="testQueue" acknowledgementMode="AUTO"/>
</flow>

For additional known issue information about this product, see Known Issues.

See Also