JVM Class Loading System Statistics (Oracle GlassFish Server 3.0.1 Administration Guide)

Oracle GlassFish Server 3.0.1 Administration Guide

JVM Class Loading System Statistics

Use the following dotted name pattern for JVM class loading system statistics:

server.jvm.class-loading-system.statistic

With Java SE, additional monitoring information can be obtained from the JVM. Set the monitoring level to LOW to enable the display of this additional information. Set the monitoring level to HIGH to also view information pertaining to each live thread in the system. More information about the additional monitoring features for Java SE is available in Monitoring and Management for the Java Platform.

The Java SE monitoring tools are discussed at http://download.oracle.com/docs/cd/E17409_01/javase/6/docs/technotes/tools/.

The statistics that are available for class loading in the JVM for Java SE are shown in the following table.

Table 8–17 JVM Monitoring Statistics for Java SE Class Loading


Statistic	Data Type	Description
`loadedclasscount`	CountStatistic	Number of classes that are currently loaded in the JVM
`totalloadedclasscount`	CountStatistic	Total number of classes that have been loaded since the JVM began execution
`unloadedclasscount`	CountStatistic	Number of classes that have been unloaded from the JVM since the JVM began execution

The statistics available for threads in the JVM in Java SE are shown in the following table.

Table 8–18 JVM Monitoring Statistics for Java SE - Threads


Statistic	Data Type	Description
`allthreadids`	StringStatistic	List of all live thread ids.
`currentthreadcputime`	CountStatistic	CPU time for the current thread (in nanoseconds) if CPU time measurement is enabled. If CPU time measurement is disabled, returns -1.
`daemonthreadcount`	CountStatistic	Current number of live daemon threads.
`monitordeadlockedthreads`	StringStatistic	List of thread ids that are monitor deadlocked.
`peakthreadcount`	CountStatistic	Peak live thread count since the JVM started or the peak was reset.
`threadcount`	CountStatistic	Current number of live daemon and non-daemon threads.
`totalstartedthreadcount`	CountStatistic	Total number of threads created and/or started since the JVM started.