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 |