Analyzer java-class-unload

# Name

java-class-unload - Java Class Unloading

This analyzer shows whether HotSpot actually reclaimed classes and class-loader metadata. It produces bar charts for unload events, reclaimed class loaders, callbacks whose class names were readable, and the most frequently observed unloaded class names. These are cleanup signals: they indicate that old class-loader state was reclaimed, rather than merely that new classes were loaded.

# Resource Category

Memory.

# Application Type & Technical Stack

• Java

# Command Line Syntax

The analyzer can be invoked directly on the command-line via the orxray utility from the openresty-xray-cli software package.

Alternatively, the analyzer can also be invoked manually or automatically on the web console UI of OpenResty XRay (like on the Advanced web page).

# PID is the target process PID.
orxray analyzer run java-class-unload -p PID

# trace a shell command directly
orxray analyzer run java-class-unload -c SHELL_CMD

# PGID is the process group ID or any process's PID within the target process
# group.
orxray analyzer run java-class-unload -p -PGID

# trace any processes started from the specified executable path.
orxray analyzer run java-class-unload --exe /path/to/exe/file

# Tracing Multiple Processes

Supported.

# Output Formats

• Bar Charts
• Plain Texts

# Author

The OpenResty Inc. Team.

# Copyright

Copyright (C) by OpenResty Inc. All rights reserved.