Welcome to Undo for Java!

Version:

9.1.2

This documentation explains how to use Undo for Java - Undo’s flagship product platform for rapid software defect diagnosis & resolution.

Undo for Java comprises:

• LiveRecorder for Java (recording agent)

• Undo for Java replay tool

• Time Travel Debug for Java IntelliJ plugin

Version History

Release 9.1

• AI-assisted debugging via MCP server: Use AI assistants such as Claude to automatically investigate recordings, diagnose root causes, and report findings.

• Python API for scripting analysis against recordings.

• Copy Object ID action in the IntelliJ debugger variables panel.

• Step Across now supports Java RMI calls in addition to HTTP/REST and reactive clients.

• Added support for Java 25.

• Added support for Amazon Corretto 17 with Lilliput (compact object headers).

• Added support for Amazon Linux 2 and Amazon Linux 2023.

• JDK version no longer needs to match for replay: any supported JDK can replay recordings made with any other supported JDK.

Release 8.2

• Uses latest 8.2 version of the Undo Engine.

Release 8.1

• Uses latest 8.1 version of the Undo Engine.

• Added support for Java 21

• Added support for ARM64

Release 7.2

• Uses latest 7.2 version of the Undo Engine.

• New REST API to start recording and stop and save recording.

• New Java callback option when saving recording.

• New Undo Replay Recording Run Configuration to replay recordings on Linux hosts.

• Added support for New UI to IntelliJ.

• Added support for thread fuzzing.

• New menu item to start/save recording of IntelliJ itself.

• Added ability to hover over bbcount cell to copy bookmark bbcount (see Bookmarks).

Release 6.12

• Revamped IntelliJ plugin.

• Added support for IntelliJ IDEA 2023.1.

• Support for other JVM languages such as Kotlin and Scala.

• New Log Viewer window.

• Improved Bookmarks support.

• Ability to start/stop recording by sending a signal.

• New method profiling command.

• Step across (and new jump to span id) supports OpenTelemetry span ids.

• New command to extract class files from a recording.

Release 6.11

• Improved performance.

Release 6.10

• Added support for stepping backwards and forwards between the component services in an application architected as a set of Microservices.

Release 6.9

• Added support for IntelliJ IDEA 2022.2.

• Added support for Java 18.

Release 6.8

• Added support for recording and replaying applications under WSL2 on Windows.

• Added support for IntelliJ IDEA 2022.1. Dropped support for IntelliJ IDEA 2020 and earlier.

Release 6.7

• >20% faster than 6.6 on typical Spring Boot applications.

• Added support for Java 17.

Release 6.6

• Adds “Log Jump” - jump from a log line of interest to the exact point in time in your application’s execution where it was emitted.

• Added support for IntelliJ IDEA 2021.3. Dropped support for IntelliJ IDEA 2019 and earlier.

Release 6.5

• Unified record and replay bundles for all supported Java versions.

• Added support for IntelliJ IDEA 2021.2.

Release 6.4

• Faster interactive performance in IntelliJ when replaying recordings.

• Added support for Java 16.

Release 6.3

• Improved variable display when replaying JIT-optimzed code.

• Faster interaction in IntelliJ when stepping through recordings with a deep call stack.

• Added support for IntelliJ IDEA 2021.1.

Release 6.2

• Added support for time travel debugging of “live” applications, in addition to time travel debugging of recorded applications.

• Added support for Java 15.

Release 6.1

• Added support for IntelliJ IDEA 2020.2. Dropped support for IntelliJ IDEA 19.1 and earlier.

Release 6.0

• First Undo release with support for the Java language.