Java Experiments

A Java experiment has additional records in the map.xml file, both for dynamic functions created by the JVM software for its internal purposes, and for dynamically-compiled (HotSpot) versions of the target Java methods.

In addition, a Java experiment has a JAVA_CLASSES file, containing information about all of the user’s Java classes invoked.

Java tracing data is recorded using a JVMTI agent, which is part of libcollector.so. The agent receives events that are mapped into the recorded trace events. The agent also receives events for class loading and HotSpot compilation, that are used to write the JAVA_CLASSES file, and the Java-compiled method records in the map.xml file.