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Mule Runtime Issues and Errors

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Open Beta Release: The cloud IDE is in open beta. Any use of Anypoint Code Builder in its beta state is subject to the applicable beta services terms and conditions, available from the IDE.

Anypoint Code Builder includes bundled Mule runtime versions that enable instant project opening and design. When you run or debug applications, the IDE checks for the exact runtime version specified in your project. If the exact version isn’t available locally, error dialogs appear to help you resolve the issue.

Don’t change the default locations of Mule. If you receive an error that Mule isn’t found or installed, configure the Mule Home path.

When you configure Mule runtime, ensure you define the mule.homeDirectory property.

The mule.runtime.muleRuntimesDirectory and mule.runtime.muleHome properties are legacy configurations no longer used.

  • Mule runtime versions: The Mule runtime versions are located in the {yourACBHome}/runtimes directory.

    Default value: /Users/{user}/AnypointCodeBuilder/runtime.

  • Mule Home: The full path that points to the root files of the Mule instance.

    Default value: /Users/<user-name>/AnypointCodeBuilder/runtime/<mule-runtime-installation>

Mule Runtime Is Not Installed

The error Mule Runtime Is Not Installed, You Must Configure a Mule Runtime to Enable This Feature occurs if Mule Home is misconfigured or empty and a feature requires a running Mule instance. For example, auto completion and debugging features require Mule to run.

To troubleshoot this issue, use this procedure:

  1. Locate the Mule > Runtime: Mule Home property:

    The Settings gear icon highlighted in the Anypoint Code Builder menu panel

  2. Provide the full path to the folder that contains Mule runtime. This field must not be empty.

    Settings dialog showing Mule Home configuration field with default path

No Mule Runtime Found

The warning No Mule runtime found. To perform this action, you must have Mule runtime configured. occurs if:

  • Mule isn’t configured properly when you open Anypoint Code Builder

  • The Mule Home field is misconfigured or empty

To troubleshoot this issue, use this procedure:

  1. Go to your Anypoint Code Builder view, and select Open ACB Settings.

    The Settings gear icon highlighted in the Anypoint Code Builder menu panel

  2. Locate the Mule > Runtime: Mule Home property:

    Settings dialog showing Mule Home configuration field with default path

  3. Provide the full path to the folder that contains Mule runtime. This field must not be empty.

Please Download and Install a JDK to Compile Your Project

This request is not from MuleSoft or Anypoint Code Builder:

Notification showing a request to download and install a JDK to compile a project

Instead of using this feature, you can use the command Download Mule Runtime and Java Versions. See Version Settings for Mule, Java, and Connectors.

Mule Runtime Version Not Defined

The error Mule runtime version not defined occurs when your project doesn’t specify a Mule runtime version in the project’s mule-artifact.json file.

To resolve this issue:

  1. Click Open Project Properties in the error dialog, or run the command MuleSoft: Open Mule Project Properties.

  2. In Project Properties, select a Mule runtime version.

  3. Click Apply.

Java Version Not Defined

The error Java version not defined occurs when your project doesn’t specify a Java version in the project’s mule-artifact.json file.

To resolve this issue:

  1. Click Open Project Properties in the error dialog, or run the command MuleSoft: Open Mule Project Properties.

  2. In Project Properties, select a Java version.

  3. Click Apply.

Mule Runtime Version Not Found (Compatible Version Available)

The error Mule runtime [version] not found occurs when you try to run or debug an application, but the exact Mule runtime version specified in your project isn’t available locally. However, a compatible local version is available.

To resolve this issue, you have two options:

  • Continue with compatible version: Click Continue to use the latest local compatible version. The dialog shows which version to use.

  • Select a different version: Click Open Project Properties to select a different local Mule runtime version or install the exact version using the MuleSoft: Install Runtime command.

Mule Runtime Version Not Found (No Compatible Version)

The error Mule runtime [version] not found occurs when you try to run or debug an application, but the exact Mule runtime version specified in your project isn’t available locally, and no compatible version is available.

To resolve this issue:

  1. Click Open Project Properties in the error dialog.

  2. In Project Properties, either:

    • Select a locally available Mule runtime version from the dropdown, or

    • Use the MuleSoft: Install Runtime command to download the required version.

  3. Click Apply.

Java Version Not Found

The error Java [version] not found occurs when you try to run or debug an application, but the Java version specified in your project isn’t available locally.

To resolve this issue:

  1. Click Open Project Properties in the error dialog.

  2. In Project Properties, either:

    • Select Java 17 (or another available version) from the dropdown, or

    • Use the MuleSoft: Download Mule Runtime and Java Versions command to download the required Java version.

  3. Click Apply.

Mule Runtime and Java Version Not Found

The error Mule runtime [version] and Java [version] not found occurs when you try to run or debug an application, but both the Mule runtime and Java versions specified in your project aren’t available locally.

To resolve this issue:

  1. Click Open Project Properties in the error dialog.

  2. In Project Properties:

    • Select a locally available Mule runtime version and Java 17 (or another compatible version) from the dropdowns, or

    • Use the MuleSoft: Install Runtime command to download the required Mule runtime version, and use the MuleSoft: Download Mule Runtime and Java Versions command to download the required Java version.

  3. Click Apply.

Reinstall Mule Runtime

If your Mule runtime installation becomes corrupted, you can force a reinstallation:

  1. Close Anypoint Code Builder.

  2. Navigate to your Mule runtime directory: ${user.home}/AnypointCodeBuilder/runtimes.

  3. Remove or rename the folder for the runtime version you want to reinstall (for example, mule-4.6.0).

  4. Open Anypoint Code Builder.

  5. Select the Mule runtime version from Project Properties.

    The IDE downloads and reinstalls the selected version. For details on selecting versions, see Select Mule and Java Versions for a Project.

Your projects and other installed Mule runtime versions are not affected.