DataWeave 2.11.0 Release Notes

This MuleSoft programming language simplifies data transformation tasks and serves as Mule runtime’s expression language for configuring components and connectors. Build powerful integration solutions with intuitive scripting capabilities.

For more detail, see DataWeave Language.

February 4, 2026

DataWeave 2.11.0 is bundled with the Mule 4.11.0 release. For details about the Mule release, see Mule Runtime Engine 4.11.0 Release Notes.

What’s New

The 2.11.0 version of DataWeave introduces these new features and enhancements:

Streaming and Memory Efficiency:

The dw::core::Binaries::fromBase64 and dw::core::Binaries::toBase64 functions now process input data in chunks instead of loading the entire String or Binary into memory. This improves scalability and helps prevent out-of-memory errors when working with large payloads.

Lazy Variable Materialization:

Variables are now materialized independently and only when needed. This reduces unnecessary memory usage and improves performance, especially in complex transformations with multiple variables.

Enhanced try Function Behavior:

The try function now performs eager materialization of its execution scope. This ensures that all expressions inside the try block are executed and that any errors are properly caught during execution.

General improvements:

DataWeave libraries are now precompiled during service startup, reducing warm-up time and improving first-execution performance.
Memory usage during DataWeave parsing and compilation is now optimized, resulting in a smaller overall memory footprint for applications using DataWeave.
DataWeave incorporates new system properties. See DataWeave System Properties.

Compatibility

This table specifies which version of DataWeave is bundled with each Mule runtime engine release:

Mule Version	DataWeave Version
4.11	2.11
4.10	2.10
4.9	2.9
4.8	2.8
4.7	2.7
4.6	2.6
4.5	2.5
4.4	2.4
4.3	2.3
4.2	2.2
4.1	2.1
3.9	1.2
3.8	1.1
3.7	1.0

Fixed Issues

The release addresses these DataWeave issues and incorporates all patch updates from the 2.10.0 DataWeave release through January 2026:

Issue Resolution ID

Issue Resolution	ID
AST scope navigation now works correctly for cross-file references when using the Tooling API.	W-20212809
A specific overload for `isEmpty` on binaries is now available to prevent implicit coercion to other types.	W-20049958
Materialized Java values are now cached to allow multiple executions using the same value.	W-20091279
Semantic tokens are now supported in the Tooling API.	W-19846990
`NullPointerException` no longer occurs when handling annotation types.	W-19853000
`LogLevel` documentation is now included directly in the code.	W-17800393
The commons-beanutils library is upgraded.	W-3300013
Base64 encoding and decoding now support payloads larger than memory.	W-18575719
Eager materialization is now supported on values, enabling caching of all exceptions inside the `try` function.	W-19717874
Avro `enum`, `map`, `union`, and `fixed` types are now supported as top-level elements.	W-19596039
`WeaveCompiler` now allows precompiling mappings and modules without validation or type checking.	W-19667273
Type check errors are now correctly reported when resolving type checking on subgraphs.	W-19564697
Lazy loading of source files is now enabled during binary compilation, avoiding unnecessary memory usage.	W-19594703
Type inference now works correctly when using the `--` operator to subtract a key from an object.	W-19595907
Warning and error messages now propagate correctly between compilation phases.	W-19386849
Base types are now used to validate accepted values, preventing premature materialization.	W-18943395
Optional types now propagate correctly through chains of value selectors.	W-19272070
The syntax version is now added to `TypeGraph` and `WeaveTypeResolution`.	W-19271992
The classloader resource resolver now resolves paths correctly on Windows systems.	W-19407283

AST scope navigation now works correctly for cross-file references when using the Tooling API.

W-20212809

A specific overload for isEmpty on binaries is now available to prevent implicit coercion to other types.

W-20049958

Materialized Java values are now cached to allow multiple executions using the same value.

W-20091279

Semantic tokens are now supported in the Tooling API.

W-19846990

NullPointerException no longer occurs when handling annotation types.

W-19853000

LogLevel documentation is now included directly in the code.

W-17800393

The commons-beanutils library is upgraded.

W-3300013

Base64 encoding and decoding now support payloads larger than memory.

W-18575719

Eager materialization is now supported on values, enabling caching of all exceptions inside the try function.

W-19717874

Avro enum, map, union, and fixed types are now supported as top-level elements.

W-19596039

WeaveCompiler now allows precompiling mappings and modules without validation or type checking.

W-19667273

Type check errors are now correctly reported when resolving type checking on subgraphs.

W-19564697

Lazy loading of source files is now enabled during binary compilation, avoiding unnecessary memory usage.

W-19594703

Type inference now works correctly when using the -- operator to subtract a key from an object.

W-19595907

Warning and error messages now propagate correctly between compilation phases.

W-19386849

Base types are now used to validate accepted values, preventing premature materialization.

W-18943395

Optional types now propagate correctly through chains of value selectors.

W-19272070

The syntax version is now added to TypeGraph and WeaveTypeResolution.

W-19271992

The classloader resource resolver now resolves paths correctly on Windows systems.

W-19407283

Upgrade

This version of DataWeave is bundled with Mule. DataWeave upgrades take place through Mule. See Mule Upgrades and Patch Updates.