JMeter 6.0.0 Release Notes

About these release notes

This page lists every documented change shipped in Apache JMeter 6.0.0, generated from the official changelog. For download and upgrade guidance, see Download JMeter.

Highlights

• Java 17 or later is now required to run JMeter; Java 21 is recommended. Kotlin 1.9+ is required for Kotlin-based scripts.
• HiDPI mode is applied automatically in the GUI, so the interface renders sharply on high-resolution displays.
• HTTP sampler changes: the original HTTP method is preserved when following 307/308 redirects, and ; charset= is no longer appended automatically to multipart/form-data requests.
• JSON Extractor now supports trailing empty default values, so expressions like ${VAR:-} are handled correctly.
• Dependency refresh: Apache Tika 3.x, Groovy 5.x, Saxon-HE 12.x, Bouncy Castle 1.82, json-path 2.10.0, and the Rhino JavaScript engine 1.8.0.
• New branding: the feather icon was replaced by an oak leaf in the JMeter logo.

Change summary

Section	Changes
Changes	23
Bug fixes	6

Changes

General

• PR#6220 Require Java 17 or later for running JMeter
• PR#6550 Require Kotlin 1.9 or later for running JMeter
• PR#6274 Change references to old MySQL driver to new class com.mysql.cj.jdbc.Driver
• Issue#6352 Calculate delays in Open Model Thread Group and Precise Throughput Timer relative to start of Thread Group instead of the start of the test.
• Issue#6357PR#6358 Ensure writable directories when copying template files while report generation.
• PR#6509PR#6675 Synchronize recent file menu across multiple JVMs. Contributed by Corneliu C (https://github.com/KingRabbid)
• PR#6596Fallback to English locale when loading test plans that use string values for enum properties, so old sample plans load correctly even with non-English locales.

HTTP Samplers and Test Script Recorder

• PR#5891Skip Internet Explorer 6-9 conditional comment processing when fetching resource links
• Issue#5466Allow enabling or disabling individual HTTP request arguments in the HTTP Sampler UI. Contributed by Pasquale Pochop (github.com/pochopsp)
• Issue#6250Avoid adding ”; charset=” automatically to multipart/form-data requests to align behavior with modern HTTP clients.
• Issue#6080Preserve the original HTTP method when following 307 and 308 redirects according to the HTTP specification. Contributed by LeeJiWon (github.com/dlwldnjs1009)
• Issue#6267PR#6268Add a space between key and value after : in View Results Tree > Sampler result tab for better readability.

Timers, Assertions, Config, Pre- & Post-Processors

• Issue#6448Support trailing empty default values in JSON Extractor so expressions like \${VAR:-} are handled correctly. Contributed by Raul Almeida (github.com/ratacolita)
• PR#6596Add a schema for ConstantThroughputTimer and use it to ensure required properties are initialized properly.

Non-functional changes

• Update Apache Tika to 3.x from 1.x to use the latest parser engine.
• Update Saxon-HE to 12.x from 11.x for XSLT and XQuery processing.
• Update Groovy to 5.x for the Groovy-based scripting environment.
• Update Bouncy Castle to 1.82 for cryptographic operations.
• Update json-path to 2.10.0 for JSON query expressions.
• Update Neo4j Java driver to 6.x for Bolt-based database tests.
• Update Rhino JavaScript engine to 1.8.0 for JSR-223 JavaScript execution.

UI

• PR#6333Apply HiDPI mode automatically when setting up the GUI so JMeter looks sharp on high-resolution displays. Contributed by Gabriele Coletta (github.com/gdmg92)
• PR#6656Replace the previous feather icon with the new oak leaf in the JMeter logo.

Bug fixes

General

• PR#6654Issue#6611Support JDK 25 and above for result collectors with empty file names
• Trim whitespace when parsing numeric JMeter properties so accidental spaces do not silently change configuration values.
• PR#6372Fix KeyManager logging when using CLI mode so keystore passwords are not incorrectly reported as missing. Contributed by Patrick Uiterwijk (patrick at puiterwijk.org)
• Issue#5937Remove deprecated Log4j package scanning and configure plugin metadata processing to improve startup time and avoid deprecation warnings. Contributed by Piotr P. Karwasz (github.com/piotrgithub)
• PR#6620Fix report generation paths so dashboard output files are created in the correct location after internal refactoring.
• Bug 6456Handle malformed percent-encoded URLs gracefully when recording HTTP traffic, logging a warning instead of failing the recording.

Thanks

We thank all contributors mentioned in bug and improvement sections above:

• Raul Almeida (github.com/ratacolita)
• Pasquale Pochop (github.com/pochopsp)
• Gabriele Coletta (github.com/gdmg92)
• Patrick Uiterwijk (patrick at puiterwijk.org)
• Piotr P. Karwasz (github.com/piotrgithub)

We also thank bug reporters who helped us improve JMeter.

Apologies if we have omitted anyone else.

Useful links

• Download JMeter
• Getting started guide
• All release notes
• Current changes page
• History of previous changes