8 Troubleshooting Tools

This chapter describes various troubleshooting tools available in Java SE and compares their functionality to those available in Oracle JRockit.

Troubleshooting Tools Available in Java SE

Note:

Some of the tools described in this document require a commercial license for use in production. To learn more about commercial features and how to enable them, see http://www.oracle.com/technetwork/java/javaseproducts/.

Troubleshooting Tools Available in Java SE

The following table lists various tools available for troubleshooting in Java SE. Some of these tools have been brought over from Oracle JRockit to HotSpot VM for providing comparable functionality.

Table 8-1 Tools

Java SE Troubleshooting Tools	Notes/Resources
Java Flight Recorder and Mission Control	Java Mission Control What are Java Flight Recordings How to produce a Flight Recording Inspect a Flight Recording Debug a Memory Leak Using Java Flight Recorder Java Mission Control User's Guide
Serviceability Agent	Article on Serviceability Agent
Java VisualVM	Troubleshoot with Java VisualVM Java VisualVM Guide
JConsole	Troubleshoot with JConsole JConsole
jcmd command utility	Troubleshoot with jcmd Utility jcmd
JDK utilities	There are many useful utilities bundled with JDK: jdb jhat jinfo jmap jps jstack jstat jrunscript jsadebugd jstatd
visualgc	visualgc Tool
Native Memory Tracking Too	-XX:NativeMemoryTracking=mode Specifies the mode for tracking JVM native memory usage. This option is useful for tracking the native memory usage by the JVM. http://hirt.se/blog/?p=401
JOverflow - Experimental plug-in	There is still no Memory Leak Detector Tool available in Java SE. However, there is an experimental plugin for Java Mission Control that can be used to detect memory leaks: http://hirt.se/blog/?p=343