Using versions of the JavaTM Virtual Machine (JVM) software
earlier than 1.4.2 compromises the data as follows:
- JVM 1.4.1: The JavaTM representation is correctly recorded and shown, but all
JVM housekeeping is shown as the JVM functions themselves. Some of the time spent executing
JVM code in data space is shown with names for the code regions as supplied by the JVM software.
A significant amount of time is spent in the
<Unknown>
function, since some
of the code regions created by the JVM software are not named. In addition, various bugs
in JVM 1.4.1 might cause the program being profiled to crash.
- JVM 1.4.0: No Java representation is possible, and a significant amount of time
is shown in
<Unknown>
. HotSpot-compiled functions are shown by name in the machine
representation.
- JVM software earlier than 1.4.0: Profiling Java applications with JVM software earlier than 1.4.0 is not supported.
Note: the terms "Java Virtual Machine" or "JVM" mean a virtual machine for the Java platform.
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