Mule Runtime 4.4 Features

Mule runtime engine 4.4 provides important enhancements and fixes. Deploy all your new and existing applications to Mule 4.4 to benefit from all the improvements in this version.

Correlation ID Management

Mule 4.4 enables you to modify the correlation ID associated with a Mule event. You can also change the algorithm Mule uses to generate each correlation ID.

Improved Logging Capabilities

Mule 4.4 incorporates Mapped Diagnostic Context (MDC), which enriches logging and improves tracking by providing more context or information in the logs for Mule events.

By using the Mule Tracing module, you can add, remove, and clear variables from the logging context for a given Mule event.

DataWeave Updates

The 2.4 version of DataWeave introduces the following features:

• Ability to read larger-than-memory strings automatically: When you are using the indexed reader strategy and processing a String with a size larger than 1.5 MB, DataWeave automatically splits the value in chunks to avoid out-of-memory issues. Related reader properties are com.mulesoft.dw.max_memory_allocation and com.mulesoft.dw.buffered_char_sequence.enabled. Refer to Indexed Readers in DataWeave.

• New reader and writer properties for working with data formats: For example, the XML writer now enables you to define namespaces at the root level.

• Many new modules, functions, types, annotations, and variables: Some are experimental and subject to change in future releases.

• A number of functions are overloaded to introduce new helper functions for handling null values.

Changes to the documentation include: more detailed function signatures, and organization of the functions by their module names, such as dw::Core, dw::core::Strings, and dw::util::Math.

New Properties for Data Formats

DataWeave introduces the following reader and writer properties:

• DataWeave (dw) reader property: privileges enable you to provide a comma-separated list of privileges to use in the format, such as Resources,Properties

• Excel (XLSX) reader property: tableLimit enables you to set the position of the last column in each row.

• YAML writer property: writeDeclaration enables you to write the header declaration.

• XML writer properties: defaultNamespace specifies the default namespaces of the output XML, and writeDeclaredNamespaces marks the namespaces to declare in the root element of the XML.

New DataWeave Function Modules and Features

New DataWeave modules and features:

• dw::Core introduces new functions and annotations:

  • indexOf

  • lastIndexOf

  • onNull

  • then

  • Core Annotations introduce a number of new annotations.

• dw::core::Dates is a new module with functions and types to create and manipulate Date types; for example, the function today.

• dw::core::Strings introduces new functions:

  • collapse

  • countCharactersBy

  • countMatches

  • everyCharacter

  • first

  • hammingDistance

  • last

  • levenshteinDistance

  • lines

  • mapString

  • remove

  • replaceAll

  • reverse

  • someCharacter

  • substring

  • substringBy

  • substringEvery

  • words

• dw::util::Coercions is a new DataWeave module with functions and types to simplify data type transformations, for example, the function toString.

• dw::util::Math is a new DataWeave module with functions and variables that provides mathematical functions; for example, the function sin.

• dw::util::Periods is a new DataWeave module with functions and types to simplify the creation of Periods; for example, the function days.

• dw::util::Tree introduces new functions:

  • filterArrayLeafs

  • filterObjectLeafs

  • filterTree

  • isArrayType

  • isAttributeType

  • isObjectType

• dw::util::Values provides a new type UpdaterValueProvider.

Core Components

Mule 4.4 introduces the Mule Tracing Module (available in Studio 7.11), which enables correlation ID management capabilities, as well as improved logging options.

Feature Flags

Mule 4.4 incorporates a feature flagging mechanism, which enables you to control the enablement of certain Mule features that affect backward compatibility.