The package-level documentation for the java.lang.instrument package describes two ways an implementation might allow use JVM instrumentation.

02-12 01:45:04.386 10153 10153 E CrashMetricHelper: at com.google.common.collect.j0.a(JdkBackedImmutableMap.java:5) 02-12 01:45:04.386 10153 10153 E CrashMetricHelper ...

JavaScript syntax in many ways is actually more like Java’s than some of these languages, but its prototype-based approach to object-orientation is very different.

The Java Platform provides support for this capability in the form of reference queues: instances of the java.lang.ref.ReferenceQueue class.