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JDK Flight Recorder
open-in-new
<p>JDK Flight Recorder is an event recorder built into the OpenJDK <a href="/facts/Java_virtual_machine/l9Nzrsun">Java virtual machine</a>. It can be thought of as the software equivalent of a Data Flight Recorder (Black Box) in a commercial aircraft. It captures information about the <a href="/facts/Java_virtual_machine/l9Nzrsun">JVM</a> itself, and the application running in the JVM. There is a wide variety of data captured, for example method profiling, allocation profiling and garbage collection related events. The JDK Flight Recorder was designed to minimize the <a href="/facts/Observer_effect_(information_technology)/fFP56J6G">Observer Effect</a> in the profiled system, and is meant to be always on in production systems. The technology was open sourced in 2018. </p><p>Analysis and visualization of flight recordings are normally done using <a href="/facts/JDK_Mission_Control/ocgdfxVo">JDK Mission Control</a>. </p>