--- schema_version: "1" id: 013c698b0547f91e770ead6cf4ac2824c845291f4dcded886809ad3cc549fa01 title: DataWeave 2.9.0 Release Notes collection: mulesoft version: current locale: ja-jp portal_url: https://docs.salesforce.com/mulesoft/current/ja-jp/release-notes/dataweave/dataweave-2.9.0-release-notes.md canonical_url: https://docs.mulesoft.com/jp/release-notes/dataweave/dataweave-2.9.0-release-notes source_site: docs.mulesoft.com content_type: documentation content_hash: bfa03f3aa39ad6d9c9e83e29ce87da49f67c843ae75f5fe8a7425bfef4f6677a description: MuleSoft Documentation Site latest: true --- # DataWeave 2.9.0 Release Notes Unresolved include directive in modules/ROOT/pages/dataweave/dataweave-2.9.0-release-notes.adoc - include::dataweave::partial$dataweave-intro.adoc\[\] For more detail, see [DataWeave Language](https://docs.mulesoft.com/dataweave/latest/). ## [](#september-2026)September 2026 DataWeave 2.9.18 is bundled with the Mule 4.9.21 release. The Mule patch release addresses these DataWeave issues:

Issue Resolution ID

Issue Resolution	ID
Vulnerable dependencies are upgraded to address reported security vulnerabilities.	W-23924223
You can now configure the size of the DataWeave script parser cache by using the `mule.weave.script.parser.cache.size` system property.	W-23138851
A thread-safety livelock no longer occurs in the Java module builder and converter caches.	W-23652160

Vulnerable dependencies are upgraded to address reported security vulnerabilities.

W-23924223

You can now configure the size of the DataWeave script parser cache by using the mule.weave.script.parser.cache.size system property.

W-23138851

A thread-safety livelock no longer occurs in the Java module builder and converter caches.

W-23652160

Issue Resolution ID

Issue Resolution	ID
The repeated attribute selector (`.*@`) now correctly preserves values when processing data structures containing empty map slots.	W-23457314
The Jackson library is upgraded to 2.21.5.	W-23037592
The `per_app_java_bean_cache` compatibility flag now correctly reports its creation version as 2.9.	W-22417507

The repeated attribute selector (.*@) now correctly preserves values when processing data structures containing empty map slots.

W-23457314

The Jackson library is upgraded to 2.21.5.

W-23037592

The per_app_java_bean_cache compatibility flag now correctly reports its creation version as 2.9.

W-22417507

Issue Resolution ID

Issue Resolution	ID
Scope resolution errors no longer occur when importing Java classes with self-referential array properties.	W-22914494
`AvroReader` no longer causes memory leaks when processing Avro data in long-running flows.	W-22364385

Scope resolution errors no longer occur when importing Java classes with self-referential array properties.

W-22914494

AvroReader no longer causes memory leaks when processing Avro data in long-running flows.

W-22364385

Issue Resolution ID

Issue Resolution	ID
`StackOverflowError` errors no longer occur when computing or converting type metadata for self-referencing recursive types.	W-21712344
The Java bean metadata cache no longer performs unnecessary evictions when processing Java POJOs. A new per-app Java bean cache can be enabled with the `per_app_java_bean_cache` compatibility flag.	W-22417507

StackOverflowError errors no longer occur when computing or converting type metadata for self-referencing recursive types.

W-21712344

The Java bean metadata cache no longer performs unnecessary evictions when processing Java POJOs. A new per-app Java bean cache can be enabled with the per_app_java_bean_cache compatibility flag.

W-22417507

Issue Resolution ID

Issue Resolution	ID
`atBeginningOfDay` now returns the midnight offset on DST days, instead of the input offset.	W-21614817

atBeginningOfDay now returns the midnight offset on DST days, instead of the input offset.

W-21614817

Issue Resolution	ID
The Avro library is upgraded to 1.12.1. The Jackson Core library is upgraded to 2.21.1.	W-21415439
The Jakarta Mail library is upgraded to 2.1.5.	W-21320250
The range operator now returns null for invalid ranges.	W-21781423

Issue Resolution

The Avro library is upgraded to 1.12.1. The Jackson Core library is upgraded to 2.21.1.

W-21415439

The Jakarta Mail library is upgraded to 2.1.5.

W-21320250

The range operator now returns null for invalid ranges.

W-21781423

Issue Resolution ID

Issue Resolution	ID
The Array range selector operator no longer experiences performance degradation.	W-20220578
Concurrent access to `KeyValuePairs` inside lazy materialized objects no longer causes unexpected behavior.	W-21045501

The Array range selector operator no longer experiences performance degradation.

W-20220578

Concurrent access to KeyValuePairs inside lazy materialized objects no longer causes unexpected behavior.

W-21045501

Issue Resolution ID

Issue Resolution	ID
Starting in Mule runtime 4.6, you can now configure materialization settings (`mule.dw.enable_vars_materialization_pass`).	W-19580992

Starting in Mule runtime 4.6, you can now configure materialization settings (mule.dw.enable_vars_materialization_pass).

W-19580992

Issue Resolution ID

Issue Resolution	ID
Functions now materialize correctly when the function body contains a single `var` declaration.	W-20365331
The stream reader now processes input with multi-byte characters correctly.	W-20016549

Functions now materialize correctly when the function body contains a single var declaration.

W-20365331

The stream reader now processes input with multi-byte characters correctly.

W-20016549

Issue Resolution ID

Issue Resolution	ID
The Apache Commons Lang dependency is removed from the distribution.	W-19803454
Materialization errors no longer occur when running functions.	W-19884071
Single variable materialization now works correctly for `unsafe` and `exists` selectors.	W-19581017
Each variable is now extracted from `vars`, allowing its materialization to be managed individually. The `mule.dw.enable_vars_materialization_pass` compatibility flag is added to preserve the previous materialization behavior.	W-19580992 / W-17167283

The Apache Commons Lang dependency is removed from the distribution.

W-19803454

Materialization errors no longer occur when running functions.

W-19884071

Single variable materialization now works correctly for unsafe and exists selectors.

W-19581017

Each variable is now extracted from vars, allowing its materialization to be managed individually. The mule.dw.enable_vars_materialization_pass compatibility flag is added to preserve the previous materialization behavior.

W-19580992 / W-17167283

Issue Resolution ID

Issue Resolution	ID
The `take` function now works with streaming when argument is larger than the array length.	W-19168279
`java-module` now supports object fields access when using different capitalizations.	W-19477334

The take function now works with streaming when argument is larger than the array length.

W-19168279

java-module now supports object fields access when using different capitalizations.

W-19477334

Issue Resolution	ID
A memory leak during Weave type schema resolution is now fixed.	W-19389019
Potential deadlocks no longer occur when increasing concurrency while parsing DataWeave scripts.	W-19376546

Issue Resolution

A memory leak during Weave type schema resolution is now fixed.

W-19389019

Potential deadlocks no longer occur when increasing concurrency while parsing DataWeave scripts.

W-19376546

Issue Resolution ID

Issue Resolution	ID
A `stackOverflowException` error no longer occurs during materialization.	W-18981240
The `distinctBy` function in `dw::core::Core` now works as expected when used with a CSV input.	W-18990604
DataWeave runtime types are now correctly written when outputting Java.	W-18942349
Access to multipart content raw value no longer reads the part content.	W-18892158
The `sizeOf` function now works correctly in DataWeave 2.6.14 and later.	W-18850597
The `orderBy` function now evaluates ordering criteria only when required.	W-18851259

A stackOverflowException error no longer occurs during materialization.

W-18981240

The distinctBy function in dw::core::Core now works as expected when used with a CSV input.

W-18990604

DataWeave runtime types are now correctly written when outputting Java.

W-18942349

Access to multipart content raw value no longer reads the part content.

W-18892158

The sizeOf function now works correctly in DataWeave 2.6.14 and later.

W-18850597

The orderBy function now evaluates ordering criteria only when required.

W-18851259

Issue Resolution ID

Issue Resolution	ID
This patch update reverts the fix.	W-17167283
XML encoding detection now works correctly when the declaration header is missing.	W-18853667
The `fromCharCode` function in `dw::core::Strings.` now manages surrogate characters correctly.	W-17204482
Unicode characters now render correctly at the beginning of the string when using the DataWeave `writer` function with the `onlyData` flag enabled.	W-14855645
The Apache POI library is now upgraded.	W-18253747
Experimental warning messages are no longer logged on DataWeave SDK files.	W-16384926

This patch update reverts the fix.

W-17167283

XML encoding detection now works correctly when the declaration header is missing.

W-18853667

The fromCharCode function in dw::core::Strings. now manages surrogate characters correctly.

W-17204482

Unicode characters now render correctly at the beginning of the string when using the DataWeave writer function with the onlyData flag enabled.

W-14855645

The Apache POI library is now upgraded.

W-18253747

Experimental warning messages are no longer logged on DataWeave SDK files.

W-16384926

Issue Resolution ID

Issue Resolution	ID
XML encoding is now detected before selecting a parser.	W-17637749
The performance of the `orderBy` function is now improved.	W-18439576
Reading a CSV file inside a MultiPart body now works correctly when performed more than once.	W-17147598
A memory leak of the binding context no longer occurs when using the `foreach` scope.	W-18472194
`CompilationResult` no longer retains a reference to the execution frame, which previously caused a memory leak.	W-18288980

XML encoding is now detected before selecting a parser.

W-17637749

The performance of the orderBy function is now improved.

W-18439576

Reading a CSV file inside a MultiPart body now works correctly when performed more than once.

W-17147598

A memory leak of the binding context no longer occurs when using the foreach scope.

W-18472194

CompilationResult no longer retains a reference to the execution frame, which previously caused a memory leak.

W-18288980

Issue Resolution ID

Issue Resolution	ID
Materialization issues no longer occur when using CSV content inside variables.	W-17167283
DataWeave now preserves trailing zeroes of single-element sum.	W-17283050
A compatibility flag is now added to address the different results produced by calling `sizeOf` with `NumberType`.	W-18020856
An unnecessary import is now removed from `dw::util::Diff` to eliminate a warning when running MUnit.	W-17670504
DataWeave no longer returns a format error on `readUnquotedString`.	W-18118138
Overflowing no longer occurs while reading large file on multipart format.	W-17644871
Performance issues no longer occur when using Message in DataWeave scripts.	W-18034217

Materialization issues no longer occur when using CSV content inside variables.

W-17167283

DataWeave now preserves trailing zeroes of single-element sum.

W-17283050

A compatibility flag is now added to address the different results produced by calling sizeOf with NumberType.

W-18020856

An unnecessary import is now removed from dw::util::Diff to eliminate a warning when running MUnit.

W-17670504

DataWeave no longer returns a format error on readUnquotedString.

W-18118138

Overflowing no longer occurs while reading large file on multipart format.

W-17644871

Performance issues no longer occur when using Message in DataWeave scripts.

W-18034217

Issue Resolution ID

Issue Resolution	ID
Concurrency issues no longer occur when loading modules.	W-17918619
The flat file module no longer fails when loading files with a nested depth greater than 50.	W-17495145
`xerces-j` is now updated to 2.12.2.	W-16918194

Concurrency issues no longer occur when loading modules.

W-17918619

The flat file module no longer fails when loading files with a nested depth greater than 50.

W-17495145

xerces-j is now updated to 2.12.2.

W-16918194

Issue Resolution	ID
The Java reflection lookup strategy is now improved for bean instances.	W-17624594
Consuming values now work as expected when using overloaded materialized functions.	W-17588914

Issue Resolution

The Java reflection lookup strategy is now improved for bean instances.

W-17624594

Consuming values now work as expected when using overloaded materialized functions.

W-17588914

For details about the Mule release and patch updates, see [Mule Runtime Engine 4.9.0 Release Notes](https://docs.mulesoft.com/jp/release-notes/mule-runtime/mule-4.9.0-release-notes). ## [](#february-6-2025)February 6, 2025 DataWeave 2.9.0 is bundled with the Mule 4.9.0 release. For details about the Mule release, see [Mule Runtime Engine 4.9.0 Release Notes](https://docs.mulesoft.com/jp/release-notes/mule-runtime/mule-4.9.0-release-notes). ### What’s New The 2.9.0 version of DataWeave introduces these new features and enhancements: Extended format support: - DataWeave introduces support for the Event Stream format. See [Event Stream Format](https://docs.mulesoft.com/dataweave/latest/dataweave-formats-eventstream). General improvements: - DataWeave incorporates new system properties. See [DataWeave System Properties](https://docs.mulesoft.com/dataweave/latest/dataweave-system-properties). ### Compatibility This table specifies which version of DataWeave is bundled with each Mule runtime engine release:

Mule Version	DataWeave Version
4.13	2.13
4.12	2.12
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 the following DataWeave issues and incorporates all patch updates from the 2.8.0 DataWeave release through January 2025:

Issue Resolution	ID
Java module now honors Java bean accessor methods.	W-17142345

Issue Resolution

Java module now honors Java bean accessor methods.

W-17142345

### Upgrade This version of DataWeave is bundled with Mule. DataWeave upgrades take place through Mule. See [Mule Upgrades and Patch Updates](https://docs.mulesoft.com/jp/release-notes/mule-runtime/mule-esb#mule-upgrades). ## [](#see-also)See Also - [Salesforce Help](https://help.salesforce.com) - [MuleSoft Services](https://www.mulesoft.com/support-and-services) - [Troubleshooting a Failing DataWeave Script](https://docs.mulesoft.com/dataweave/latest/dataweave-troubleshoot) - [Known Issues](https://help.salesforce.com/s/issues)