Aalto XML processor is an ultra-high performance Stax XML processor (parser, generator) implementation. It also implements SAX2 API, as well asStax2 extension to core Stax API.

Aalto is licensed under Apache License 2.0 (https://www.apache.org/licenses/LICENSE-2.0.txt).

Aalto followsApache versioning convention, and similar toSemantic Versioning from external user perspective.

Released on September 26, 2025.

Only changes were to publishing (via Sonatype Central) and Maven build; no functional changes

Released on June 7, 2024. Fixes included:

• #86: Multi-byte characters are split inwriteCData() if first byte sits right at the end of the buffer
• #90: Update stax2-api dep to 4.2.2 (from 4.2)
• #91: Multi-byte characters are split inwriteComment() if first byte sits right at the end of the buffer
• #93: Multi-byte characters are split inwritePI() if first byte sits right at the end of the buffer

Released on April 25, 2022. Fixes included:

• #78: Async parsing turns " inside element content into apostrophe

Released on January 14, 2022. Fixes included:

• #75: Fixing a bug when multi-byte characters were split

Released on May 11, 2021. Fixes included:

• #65: Support disabling General Entity Reference replacement in attribute values (using newAaltoInputProperties.P_RETAIN_ATTRIBUTE_GENERAL_ENTITIES property for SAX and Stax)
• Fix minor offset check bug inAsyncByteArrayScanner/AsyncByteBufferScanner

• Async parsing

• 1.3
• 1.2
• 1.1
• 1.0

Most commonly artifacts are accessed using Maven, via Maven 2 repositories:

• groupId:com.fasterxml
• artifactId:aalto-xml

New releases are done usingSonatype Maven repository,from which they are automatically copied (with an hour of delay) to theCentral Maven repository.Here are quick links to the central Maven repository for manual downloading:

• 1.3.4:jar (released 26-Sep-2025)
• 1.2.2:jar (released 14-Sep-2019) -- With JDK9+module-info;BufferRecycler fix
• 1.1.1:jar (released 18-Sep-2018)
• 1.0.0:jar (released 23-Nov-2015)