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JDK Mission Control 9 Release Notes

JDK Mission Control 9 Release Notes

This document describes what's new in JDK Mission Control 9 release.

New and Noteworthy

JMC 9 Release

The JMC 9 release introduces several new features, enhancements, and bug fixes. The following are some of the new features introduced in JMC 9:

Improved JFR parser performance

Reduced allocations in the JMC parser have significantly improved JFR parser performance, including reduction in Doubles and allocation rate in ParserStats. Binary search has also improved the speed of linear time reordering and linear lane search.

Search by event type ID is now enabled in the event browser

Search by event type IDs is now enabled and is displayed in a column (hidden by default) next to the event ID.

Support for enabling JFR on native images

JMC can now start flightrecorder on GraalVM native image.

Java based flamegraph visualization

To improve the performance and efficiency of the flamegraph visualization, a Java Swing based framework is now used. In addition, the performance of flame graph model creation has been improved.

User configuration for local JVM refresh interval

A new field has been added to specify the scan frequency of the JVM browser to monitor JVMs.

Support for dark mode

JMC 9 now supports dark mode. Go to Preferences, General, Appearance, and select the Dark theme to enable.

Addition of new rules

New rules have been added to use the jdk.FinalizerStatistics JFR event and display G1 MMU information.

Rule that detects GC Inverted Parallelism

A new rule has been added to JMC to detect Inverted Parallelism in GC. The new rule makes use of the new GC CPU time JFR event, which has been introduced in JDK 20. See Add rule to detect GC Inverted Parallelism for more information.

Twitter plug-in removed

Due to changes in the APIs provided by Twitter, the JMC plug-in for Twitter has been removed.

See JMC 9 userguide for a comprehensive list of all new features introduced by JMC 9.

JMC Launch Pre-requisites

JMC 9.0 requires Oracle JDK 17 or later for operation. However, JMC 9 supports Java Management Console (JMX) monitoring and Java Flight Recorder (JFR) profiling of JVMs running on JDK 7u40 or later across all supported platforms.

JMC 9 Supported Platforms

JMC 9 is supported on Windows (x64), macOS (ARM and x64), and Linux (ARM and x64)

JMC 9 Installation Instructions

While installing JMC, if you get an alert that states A Java Runtime Environment (JRE) or Java Development Kit (JDK) must be available in order to run JMC or Failed to create the Java Virtual Machine, then follow JDK Mission Control Installation Instructions.

JMC as Eclipse Plug-in

JMC 9, when run as an Eclipse Plug-in, requires Eclipse 2023-12 or later. To install JMC as a plug-in in Eclipse, follow the instructions provided at JDK Mission Control for Eclipse.

Known Issues

The following table lists the known issues in the JDK Mission Control 9 release.

JMC Number Description
1 JMC-6739 Unable to perform flight recordings on jLinked applications
2 JMC-7071 JMC wrongly attaches itself with other (unsupported) JVMs
3 JMC-7560 Stacktrace graph views are not shown on Windows
4 JMC-7953 Unable to install JMC Plugins on Eclipse 4.25

Fixed Issues

The following table lists the fixed issues in the JDK Mission Control 9 release.

JMC Number Description
1 JMC-7007 Unable to edit eclipse project run configurations after installing JMC plugins on Linux
2 JMC-7220 Unable to open JMX Console after installing plugins in macOS and Linux