Troubleshooting Tools and Utilities
bundled with Java SE

HPROF Profiler

HPROF Profiler is a Heap and CPU profiling tool. It is capable of presenting CPU usage, heap allocation statistics, and monitor contention profiles. In addition, it can also report complete heap dumps and states of all the monitors and threads in the Java virtual machine.

• HPROF: A Heap/CPU Profiling Tool in J2SE 5.0

JConsole Utility

JConsole can be used to observe information about an application running on the Java platform. It uses the extensive instrumentation of the Java virtual machine to provide information on performance and resource consumption of applications running on the Java platform using Java Management Extension (JMX) technology. JConsole helps to:

• Detect low memory
• Enable or disable GC and class loading verbose tracing
• Detect deadlocks
• Control the log level of any loggers in an application
• Access OS resourcesSun's platform extension
• Manage an application's Managed Beans (MBeans)

Links:

• jconsole - Java Monitoring and Management Console
• Using JConsole to Monitor Applications
• Troubleshooting Connection Problems in JConsole

jhat Utility

jhat - Java Heap Analysis Tool enables you to browse java heap dumps in your favourite webbrowser.

• jhat - Java Heap Analysis Tool
• jhat (Blog)

jinfo Utility

jinfo prints configuration information for for a given process or core file or a remote debug server.

• jinfo - Configuration Info

jmap Utility

jmap prints shared object memory maps or heap memory details of a given process or core file or a remote debug server.

• jmap - Memory Map

jstack Utility

jstack prints a stack trace of threads for a given process or core file or remote debug server.

• jstack - Stack Trace

jstat Utility

jstat is JVM Statistics Monitoring Tool. It attaches to an instrumented HotSpot Java virtual machine and collects and logs performance statistics as specified by the command line options.

• jvmstat 3.0 (Code Sample)
• jstat - Java Virtual Machine Statistics Monitoring Tool

jstatd daemon

JVM jstat Daemon - Launches an RMI server application that monitors for the creation and termination of instrumented HotSpot Java virtual machines and provides a interface to allow remote monitoring tools to attach to Java virtual machines running on the local system.

• jstatd - Virtual Machine jstat Daemon