JFR is a low-overhead data collection framework for troubleshooting Java applications and the HotSpot JVM in production. Recorded data can be opened in JDK Mission Control (JMC). To start recordings from within JMC, a new version of JMC is required. Currently, it is not released as part of the JDK but is available as a downloadable patch from Supported Java SE Downloads on MOS or from JDK Mission Control 8 Downloads. JFR comes with a supported API to produce and consume data programmatically.
Media playback does not work on Ubuntu 20.04. This affects all media formats (such as, mp4, mp3, wav, etc.). In some cases, an error will be thrown. In other cases, the media player will switch to the ready state, but playback will not start. There is no workaround for this issue. This issue should be resolved by JDK-8239095.
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