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# Anypoint MQ Connector Release Notes for Mule 4

> For the full documentation index, see: https://docs.mulesoft.com/llms.txt

Support Category:
[Select](https://www.salesforce.com/en-us/wp-content/uploads/sites/4/documents/legal/Agreements/versioning-back-support-policy.pdf)

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.

> [!NOTE] 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](https://docs.mulesoft.com/anypoint-mq-connector/latest/)

## 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

<table><colgroup><col> <col></colgroup><thead><tr><th>Software</th><th>Version</th></tr></thead><tbody><tr><td><p>Mule</p></td><td><p>4.1.0 and later</p></td></tr><tr><td><p>OpenJDK</p></td><td><p>8, 11, and 17</p></td></tr></tbody></table>

## 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

<table><colgroup><col> <col></colgroup><thead><tr><th>Software</th><th>Version</th></tr></thead><tbody><tr><td><p>Mule</p></td><td><p>4.1.0 and later</p></td></tr><tr><td><p>OpenJDK</p></td><td><p>8, 11, and 17</p></td></tr></tbody></table>

## 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

<table><colgroup><col> <col></colgroup><thead><tr><th>Software</th><th>Version</th></tr></thead><tbody><tr><td><p>Mule</p></td><td><p>4.1.0 and later</p></td></tr><tr><td><p>OpenJDK</p></td><td><p>8, 11, and 17</p></td></tr></tbody></table>

## 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](https://docs.mulesoft.com/anypoint-mq-connector/latest/anypoint-mq-listener#backpressure-and-max-concurrency).

### Compatibility

<table><colgroup><col> <col></colgroup><thead><tr><th>Software</th><th>Version</th></tr></thead><tbody><tr><td><p>Mule</p></td><td><p>4.1.0 and later</p></td></tr><tr><td><p>OpenJDK</p></td><td><p>8, 11, and 17</p></td></tr></tbody></table>

## 4.0.16

**May 20, 2026**

### Fixed Issues

<table><colgroup><col> <col></colgroup><thead><tr><th>Issue Resolution</th><th>ID</th></tr></thead><tbody><tr><td><div><div><p>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.</p></div></div></td><td><div><div><p>W-22553120</p></div></div></td></tr></tbody></table>

### Compatibility

<table><colgroup><col> <col></colgroup><thead><tr><th>Software</th><th>Version</th></tr></thead><tbody><tr><td><p>Mule</p></td><td><p>4.1.0 and later</p></td></tr><tr><td><p>OpenJDK</p></td><td><p>8, 11, and 17</p></td></tr></tbody></table>

## 4.0.15 (Deprecated)

**May 19, 2026**

This version is deprecated. Upgrade to 4.0.16.

### Known Issues

<table><colgroup><col> <col> <col></colgroup><thead><tr><th>Known Issue</th><th>Workaround</th><th>ID</th></tr></thead><tbody><tr><td><div><div><p>Applications fail to deploy with <code>java.lang.IllegalStateException</code> and <code>NoSuchFileException: …​/META-INF/maven</code>. The consumable artifact published to Exchange contains a malformed <code>pom.xml</code>. The source in Nexus isn’t affected.</p></div></div></td><td><div><div><p>Upgrade to 4.0.16.</p></div></div></td><td><div><div><p>W-22553120</p></div></div></td></tr></tbody></table>

## 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

<table><colgroup><col> <col></colgroup><thead><tr><th>Software</th><th>Version</th></tr></thead><tbody><tr><td><p>Mule</p></td><td><p>4.1.0 and later</p></td></tr><tr><td><p>OpenJDK</p></td><td><p>8, 11, and 17</p></td></tr></tbody></table>

## 4.0.13

**May 29, 2025**

### Compatibility

<table><colgroup><col> <col></colgroup><thead><tr><th>Software</th><th>Version</th></tr></thead><tbody><tr><td><p>Mule</p></td><td><p>4.1.0 and later</p></td></tr><tr><td><p>OpenJDK</p></td><td><p>8, 11, and 17</p></td></tr></tbody></table>

### Fixed Issues

<table><colgroup><col> <col></colgroup><thead><tr><th>Issue Resolution</th><th>ID</th></tr></thead><tbody><tr><td><div><div><p>Anypoint MQ Connector upgrades dependencies to address reported security vulnerabilities (CVE-2024-38808 and CVE-2023-20863).</p></div></div></td><td><div><div><p>W-17873558</p></div></div></td></tr><tr><td><div><div><p>OAuth token calls now include a <code>requestId</code> to improve tracking and debugging of authentication requests.</p></div></div></td><td><div><div><p>W-18343528</p></div></div></td></tr><tr><td><div><div><p><code>Buffer is full, skipping message fetch</code> errors no longer occur when using the Anypoint MQ Connector with <code>prefetch=1</code> and <code>maxConcurrency=1</code>. Previously, these settings caused message consumption to stop until the application restarted, because competing processes held the buffer resource without releasing it.</p></div></div></td><td><div><div><p>W-15572531</p></div></div></td></tr><tr><td><div><div><p>Anypoint MQ subscriber throughput now improves when using <code>prefetch=1</code> and <code>maxConcurrency=1</code>. Previously, message consumption slowed under these settings, reducing overall processing performance.</p></div></div></td><td><div><div><p>W-15513498</p></div></div></td></tr></tbody></table>

## 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

<table><colgroup><col> <col></colgroup><thead><tr><th>Software</th><th>Version</th></tr></thead><tbody><tr><td><p>Mule</p></td><td><p>4.1.0 and later</p></td></tr><tr><td><p>OpenJDK</p></td><td><p>8, 11, and 17</p></td></tr></tbody></table>

### Fixed Issues

<table><colgroup><col> <col></colgroup><thead><tr><th>Issue Resolution</th><th>ID</th></tr></thead><tbody><tr><td><div><div><p>To facilitate troubleshooting, Anypoint MQ Connector now logs the lock ID by default when receiving messages.</p></div></div></td><td><div><div><p>W-16770759</p></div></div></td></tr><tr><td><div><div><p>The <code>commons-io</code> library is upgraded to version 2.14.0 to address reported security vulnerabilities (CVE-2024-47554).</p></div></div></td><td><div><div><p>W-16984485</p></div></div></td></tr></tbody></table>

## 4.0.11

**September 20, 2024**

### Compatibility

<table><colgroup><col> <col></colgroup><thead><tr><th>Software</th><th>Version</th></tr></thead><tbody><tr><td><p>Mule</p></td><td><p>4.1.0 and later</p></td></tr><tr><td><p>OpenJDK</p></td><td><p>8, 11, and 17</p></td></tr></tbody></table>

### Fixed Issues

<table><colgroup><col> <col></colgroup><thead><tr><th>Issue Resolution</th><th>ID</th></tr></thead><tbody><tr><td><div><div><p>A concurrency issue that sometimes caused the Subscriber to throw a NullPointerException error while calling the <code>Destination.getName()</code> method no longer occurs.</p></div></div></td><td><div><div><p>W-16600995</p></div></div></td></tr></tbody></table>

## 4.0.10

**August 16, 2024**

### Compatibility

<table><colgroup><col> <col></colgroup><thead><tr><th>Software</th><th>Version</th></tr></thead><tbody><tr><td><p>Mule</p></td><td><p>4.1.0 and later</p></td></tr><tr><td><p>OpenJDK</p></td><td><p>8, 11, and 17</p></td></tr></tbody></table>

### 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

<table><colgroup><col> <col></colgroup><thead><tr><th>Software</th><th>Version</th></tr></thead><tbody><tr><td><p>Mule</p></td><td><p>4.1.0 and later</p></td></tr><tr><td><p>OpenJDK</p></td><td><p>8, 11, and 17</p></td></tr></tbody></table>

## 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

<table><colgroup><col> <col></colgroup><thead><tr><th>Software</th><th>Version</th></tr></thead><tbody><tr><td><p>Mule</p></td><td><p>4.1.0 and later</p></td></tr><tr><td><p>OpenJDK</p></td><td><p>8, 11, and 17</p></td></tr></tbody></table>

### Fixed Issues

<table><colgroup><col> <col></colgroup><thead><tr><th>Issue Resolution</th><th>ID</th></tr></thead><tbody><tr><td><div><div><p>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).</p></div></div></td><td><div><div><p>W-15695673</p></div></div></td></tr></tbody></table>

## 4.0.7

**May 10, 2024**

### What’s New

- Anypoint MQ Connector 4.0.7 supports cross-region failover for standard queues.

  For information, see:

  - [Configuring Cross-Region Failover for Standard Queues](https://docs.mulesoft.com/mq/mq-failover)

  - [Configuring Cross-Region Failover in Your App](https://docs.mulesoft.com/anypoint-mq-connector/latest/anypoint-mq-failover)

### Compatibility

<table><colgroup><col> <col></colgroup><thead><tr><th>Software</th><th>Version</th></tr></thead><tbody><tr><td><p>Mule</p></td><td><p>4.1.0 and later</p></td></tr><tr><td><p>OpenJDK</p></td><td><p>8, 11, and 17</p></td></tr></tbody></table>

## 4.0.6

**February 5, 2024**

### Compatibility

<table><colgroup><col> <col></colgroup><thead><tr><th>Software</th><th>Version</th></tr></thead><tbody><tr><td><p>Mule</p></td><td><p>4.1.0 and later</p></td></tr><tr><td><p>OpenJDK</p></td><td><p>8, 11, and 17</p></td></tr></tbody></table>

### Fixed Issues

<table><colgroup><col> <col></colgroup><thead><tr><th>Issue Resolution</th><th>ID</th></tr></thead><tbody><tr><td><div><div><p>This connector is now compatible with Java 11.</p></div></div></td><td><div><div><p>W-14954942</p></div></div></td></tr></tbody></table>

## 4.0.5

**February 1, 2024**

### Compatibility

<table><colgroup><col> <col></colgroup><thead><tr><th>Software</th><th>Version</th></tr></thead><tbody><tr><td><p>Mule</p></td><td><p>4.1.0 and later</p></td></tr><tr><td><p>OpenJDK</p></td><td><p>8 and 17</p></td></tr></tbody></table>

### Known Issues

<table><colgroup><col> <col> <col></colgroup><thead><tr><th>Known Issue</th><th>Workaround</th><th>ID</th></tr></thead><tbody><tr><td><div><div><p>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.</p></div></div></td><td><div><div><p>Update the connector to version 4.0.6 or later if you need Java 11 support.</p></div></div></td><td><div><div><p>W-14954942</p></div></div></td></tr></tbody></table>

For additional known issue information about this product, see
[Known Issues](https://help.salesforce.com/s/issues).

## 4.0.4

**January 23, 2024**

### What’s New

- This connector is now compatible with Java 17.

### Compatibility

<table><colgroup><col> <col></colgroup><thead><tr><th>Software</th><th>Version</th></tr></thead><tbody><tr><td><p>Mule</p></td><td><p>4.1.0 and later</p></td></tr><tr><td><p>OpenJDK</p></td><td><p>8 and 17</p></td></tr></tbody></table>

### Fixed Issues

<table><colgroup><col> <col></colgroup><thead><tr><th>Issue Resolution</th><th>ID</th></tr></thead><tbody><tr><td><div><div><p>The consumer/subscriber no longer recasts integer values to double values when it retrieves the message.</p></div></div></td><td><p>W-13721361</p></td></tr></tbody></table>

### Known Issues

<table><colgroup><col> <col> <col></colgroup><thead><tr><th>Known Issue</th><th>Workaround</th><th>ID</th></tr></thead><tbody><tr><td><div><div><p>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.</p></div></div></td><td><div><div><p>Update the connector to version 4.0.6 or later if you need Java 11 support.</p></div></div></td><td><div><div><p>W-14954942</p></div></div></td></tr></tbody></table>

For additional known issue information about this product, see
[Known Issues](https://help.salesforce.com/s/issues).

## 4.0.3

**April 19, 2023**

### Compatibility

<table><colgroup><col> <col></colgroup><thead><tr><th>Software</th><th>Version</th></tr></thead><tbody><tr><td><p>Mule</p></td><td><p>4.1.0 and later</p></td></tr><tr><td><p>OpenJDK</p></td><td><p>8 and 11</p></td></tr></tbody></table>

### Fixed Issues

<table><colgroup><col> <col></colgroup><thead><tr><th>Issue Resolution</th><th>ID</th></tr></thead><tbody><tr><td><div><div><p>The Spring Framework dependency is updated to 5.0.10 to fix reported security vulnerabilities (CVE-2018-15756).</p></div><div><p>The <code>com.google.code.gson:gson</code> dependency is updated to 2.8.9 to fix reported security vulnerabilities (CVE-2022-25647).</p></div></div></td><td><p>W-12717888</p></td></tr></tbody></table>

## 4.0.2

**February 27, 2023**

### Compatibility

<table><colgroup><col> <col></colgroup><thead><tr><th>Software</th><th>Version</th></tr></thead><tbody><tr><td><p>Mule</p></td><td><p>4.1.0 and later</p></td></tr><tr><td><p>OpenJDK</p></td><td><p>8 and 11</p></td></tr></tbody></table>

### Fixed Issues

<table><colgroup><col> <col></colgroup><thead><tr><th>Issue Resolution</th><th>ID</th></tr></thead><tbody><tr><td><div><div><p>The connector now correctly supports the <code>/</code> character in <code>messageId</code>.</p></div></div></td><td><p>W-12004936</p></td></tr></tbody></table>

## 4.0.1

**February 7, 2023**

### What’s New

- Anypoint MQ Connector version 4.x supports the Connected Apps feature.

  For information, see:

  - [Configuring Connected Apps](https://docs.mulesoft.com/mq/mq-connected-apps)

  - [Upgrading and Migrating Anypoint MQ Connector](https://docs.mulesoft.com/anypoint-mq-connector/latest/anypoint-mq-connector-upgrade-migrate)

### Compatibility

<table><colgroup><col> <col></colgroup><thead><tr><th>Software</th><th>Version</th></tr></thead><tbody><tr><td><p>Mule</p></td><td><p>4.1.0 and later</p></td></tr><tr><td><p>OpenJDK</p></td><td><p>8 and 11</p></td></tr></tbody></table>

## 4.0.0

This version is deprecated. The new features for this version are in version [4.0.1](#4-0-1).

## 3.2.6

**February 6, 2024**

### Compatibility

<table><colgroup><col> <col></colgroup><thead><tr><th>Software</th><th>Version</th></tr></thead><tbody><tr><td><p>Mule</p></td><td><p>4.1.0 and later</p></td></tr><tr><td><p>OpenJDK</p></td><td><p>8, 11, and 17</p></td></tr></tbody></table>

### Fixed Issues

<table><colgroup><col> <col></colgroup><thead><tr><th>Issue Resolution</th><th>ID</th></tr></thead><tbody><tr><td><div><div><p>This connector is now compatible with Java 11.</p></div></div></td><td><div><div><p>W-14954942</p></div></div></td></tr></tbody></table>

## 3.2.5

**January 23, 2023**

### What’s New

- This connector is now compatible with Java 17.

### Compatibility

<table><colgroup><col> <col></colgroup><thead><tr><th>Software</th><th>Version</th></tr></thead><tbody><tr><td><p>Mule</p></td><td><p>4.1.0 and later</p></td></tr><tr><td><p>OpenJDK</p></td><td><p>8 and 17</p></td></tr></tbody></table>

### Fixed Issues

<table><colgroup><col> <col></colgroup><thead><tr><th>Issue Resolution</th><th>ID</th></tr></thead><tbody><tr><td><div><div><p>The consumer/subscriber no longer recasts integer values to double values when it retrieves the message.</p></div></div></td><td><p>W-13721361</p></td></tr></tbody></table>

### Known Issues

<table><colgroup><col> <col> <col></colgroup><thead><tr><th>Known Issue</th><th>Workaround</th><th>ID</th></tr></thead><tbody><tr><td><div><div><p>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.</p></div></div></td><td><div><div><p>Update the connector to version 3.2.6 or later if you need Java 11 support.</p></div></div></td><td><div><div><p>W-14954942</p></div></div></td></tr></tbody></table>

For additional known issue information about this product, see
[Known Issues](https://help.salesforce.com/s/issues).

## 3.2.4

**April 19, 2023**

### Compatibility

<table><colgroup><col> <col></colgroup><thead><tr><th>Software</th><th>Version</th></tr></thead><tbody><tr><td><p>Mule</p></td><td><p>4.1.0 and later</p></td></tr><tr><td><p>OpenJDK</p></td><td><p>8 and 11</p></td></tr></tbody></table>

### Fixed Issues

<table><colgroup><col> <col></colgroup><thead><tr><th>Issue Resolution</th><th>ID</th></tr></thead><tbody><tr><td><div><div><p>The Spring Framework dependency is updated to 5.0.10 to fix reported security vulnerabilities (CVE-2018-15756).</p></div><div><p>The <code>com.google.code.gson:gson</code> dependency is updated to 2.8.9 to fix reported security vulnerabilities (CVE-2022-25647).</p></div></div></td><td><p>W-12717888</p></td></tr></tbody></table>

## 3.2.3

**February 27, 2023**

### Compatibility

<table><colgroup><col> <col></colgroup><thead><tr><th>Software</th><th>Version</th></tr></thead><tbody><tr><td><p>Mule</p></td><td><p>4.1.0 and later</p></td></tr></tbody></table>

### Fixed Issues

<table><colgroup><col> <col></colgroup><thead><tr><th>Issue Resolution</th><th>ID</th></tr></thead><tbody><tr><td><div><div><p>The connector now correctly supports the <code>/</code> character in <code>messageId</code>.</p></div></div></td><td><p>W-12004936</p></td></tr></tbody></table>

## 3.2.2 (Deprecated)

This version is deprecated. The fixed issues for this version are in version [3.2.3](#3-2-3).

## 3.2.1 (Deprecated)

This version is deprecated. The fixed issues for this version are in version [3.2.3](#3-2-3).

## 3.2.0

**October 12, 2022**

### What’s New

- Anypoint MQ Connector now supports numeric values for user properties.

  If you plan to create _intelligent message routing rules_ on numeric properties, upgrade to this
  version of Anypoint MQ Connector.

  For information, see
  [Route Messages by Configuring Rules on Message Exchanges](https://docs.mulesoft.com/mq/mq-routing-rules).

### Compatibility

<table><colgroup><col> <col></colgroup><thead><tr><th>Software</th><th>Version</th></tr></thead><tbody><tr><td><p>Mule</p></td><td><p>4.1.0 and later</p></td></tr></tbody></table>

## 3.1.7

**May 3, 2022**

### What’s New

- This release includes security and performance improvements.

### Compatibility

<table><colgroup><col> <col></colgroup><thead><tr><th>Software</th><th>Version</th></tr></thead><tbody><tr><td><p>Mule</p></td><td><p>4.1.0 and later</p></td></tr></tbody></table>

## 3.1.6

**January 10, 2022**

### Compatibility

<table><colgroup><col> <col></colgroup><thead><tr><th>Software</th><th>Version</th></tr></thead><tbody><tr><td><p>Mule</p></td><td><p>4.1.0 and later</p></td></tr></tbody></table>

### Fixed Issues

<table><colgroup><col> <col></colgroup><thead><tr><th>Issue Resolution</th><th>ID</th></tr></thead><tbody><tr><td><div><div><p>Message Group ID now correctly supports alphanumeric characters (a-z, A-Z, 0-9) and punctuation (! " # $ % &amp; ' ( ) * + , - . / : ; &lt; = &gt; ? @ [ ] \ ^ _ ` { } | ~).</p></div></div></td><td><p>SE-23324</p></td></tr></tbody></table>

## 3.1.5

**August 11, 2021**

### Compatibility

<table><colgroup><col> <col></colgroup><thead><tr><th>Software</th><th>Version</th></tr></thead><tbody><tr><td><p>Mule</p></td><td><p>4.1.0 and later</p></td></tr></tbody></table>

### Fixed Issues

<table><colgroup><col> <col></colgroup><thead><tr><th>Issue Resolution</th><th>ID</th></tr></thead><tbody><tr><td><div><div><p>Upgraded the following library dependencies to address security vulnerabilities:</p></div><div><ul><li><p><code>com.google.guava:guava</code> upgraded to 30.0-jre.</p></li><li><p><code>commons-io:commons-io</code> upgraded to 2.7.</p></li><li><p><code>org.springframework:spring-core</code> upgraded to 5.0.6.RELEASE.</p></li></ul></div></div></td><td></td></tr></tbody></table>

## 3.1.4

**June 14, 2021**

### Compatibility

<table><colgroup><col> <col></colgroup><thead><tr><th>Software</th><th>Version</th></tr></thead><tbody><tr><td><p>Mule</p></td><td><p>4.1.0 and later</p></td></tr></tbody></table>

### 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

<table><colgroup><col> <col></colgroup><thead><tr><th>Software</th><th>Version</th></tr></thead><tbody><tr><td><p>Mule</p></td><td><p>4.1.0 and later</p></td></tr></tbody></table>

### Fixed Issues

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

## 3.1.2

**January 21, 2021**

### Compatibility

<table><colgroup><col> <col></colgroup><thead><tr><th>Software</th><th>Version</th></tr></thead><tbody><tr><td><p>Mule</p></td><td><p>4.1.0 and later</p></td></tr></tbody></table>

### 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

<table><colgroup><col> <col></colgroup><thead><tr><th>Software</th><th>Version</th></tr></thead><tbody><tr><td><p>Mule</p></td><td><p>4.1.0 and later</p></td></tr></tbody></table>

### 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

<table><colgroup><col> <col></colgroup><thead><tr><th>Software</th><th>Version</th></tr></thead><tbody><tr><td><p>Mule</p></td><td><p>4.1.0 and later</p></td></tr></tbody></table>

### 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

<table><colgroup><col> <col></colgroup><thead><tr><th>Software</th><th>Version</th></tr></thead><tbody><tr><td><p>Mule</p></td><td><p>4.1.0 and later</p></td></tr></tbody></table>

### 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

<table><colgroup><col> <col></colgroup><thead><tr><th>Software</th><th>Version</th></tr></thead><tbody><tr><td><p>Mule</p></td><td><p>4.0.0 and later</p></td></tr></tbody></table>

### 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

<table><colgroup><col> <col></colgroup><thead><tr><th>Software</th><th>Version</th></tr></thead><tbody><tr><td><p>Mule</p></td><td><p>4.0.0 and later</p></td></tr></tbody></table>

### 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

<table><colgroup><col> <col></colgroup><thead><tr><th>Software</th><th>Version</th></tr></thead><tbody><tr><td><p>Mule</p></td><td><p>4.0.0 and later</p></td></tr></tbody></table>

### 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.

> [!IMPORTANT] 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](https://help.salesforce.com/s/issues).

## 2.0.1

**July 4, 2018**

### Compatibility

<table><colgroup><col> <col></colgroup><thead><tr><th>Software</th><th>Version</th></tr></thead><tbody><tr><td><p>Mule</p></td><td><p>4.0.0 and later</p></td></tr></tbody></table>

### 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

<table><colgroup><col> <col></colgroup><thead><tr><th>Software</th><th>Version</th></tr></thead><tbody><tr><td><p>Mule</p></td><td><p>4.0.0 and later</p></td></tr></tbody></table>

### Known Issues

- Anypoint MQ Connector doesn’t support tracking.

  Example with tracking:

  ```xml
  <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:

  ```xml
  <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](https://help.salesforce.com/s/issues).

## See Also

- [Salesforce Help](https://help.salesforce.com)

- [MuleSoft Services](https://www.mulesoft.com/support-and-services)

- [Known Issues](https://help.salesforce.com/s/issues)