Sun Java System Application Server Platform Edition 8.1 2005Q2 Update 2 Administration Guide

About Monitoring

Monitoring in the Application Server

Use monitoring to observe the runtime state of various components and services deployed in a server instance of theApplication Server. With the information on the state of runtime components and processes, it is possible to identify performance bottlenecks for tuning purposes, aid capacity planning, predict failures, do root cause analysis in case of failures, and ensure that everything is functioning as expected.

Turning monitoring on reduces performance by increasing overhead.

Overview of Monitoring

To monitor the Application Server, perform these steps:

Enable the monitoring of specific services and components using either the Admin Console or the asadmin tool.

For more information on this step, refer to To configure monitoring levels using the Admin Console.

For more information on this step, refer to Admin Console Tasks for Enabling and Disabling Monitoring.
View monitoring data for the specified services or components using either the Admin Console or the asadmin tool.

For more information on this step, refer to To view monitoring data in the Admin Console or Viewing Monitoring Data With the asadmin Tool.

For more information on this step, refer to Admin Console Tasks for Viewing Monitoring Data.

About the Tree Structure of Monitorable Objects

The Application Server uses a tree structure to track monitorable objects. Because the tree of monitoring objects is dynamic, it changes as components are added, updated, or removed in the instance. The root object in the tree is the server instance name, for example, server. (In the Platform Edition, just one server instance is permitted.)

The following command displays the top level of the tree:

asadmin> list --user adminuser --monitor server
server.applications
server.http-service
server.connector-service
server.jms-service
server.jvm
server.orb
server.resources
server.thread-pools

The following sections describe these sub-trees:

The Applications Tree

The following schematic shows the top and child nodes for the various components of enterprise applications. The nodes at which monitoring statistics are available are marked with an asterisk (*). For more information, refer to EJB Container Statistics.

Example 16–1 Applications Node Tree Structure

applications
   |--- application1
   |    |--- ejb-module-1
   |    |        |--- ejb1 *
   |    |                  |--- cache (for entity/sfsb) *
   |    |                  |--- pool (for slsb/mdb/entity) *
   |    |                  |--- methods
   |    |                       |---method1 *
   |    |                       |---method2 *
   |    |                  |--- stateful-session-store (for sfsb)*
   |    |                  |--- timers (for s1sb/entity/mdb) *
   |    |--- web-module-1
   |    |        |--- virtual-server-1 *
   |    |                       |---servlet1  *
   |    |                       |---servlet2  *
   |--- standalone-web-module-1
   |    |        |----- virtual-server-2 *
   |    |                       |---servlet3 *
   |    |                       |---servlet4 *
   |    |        |----- virtual-server-3 *
   |    |                       |---servlet3 *(same servlet on different vs)
   |    |                       |---servlet5 *
   |--- standalone-ejb-module-1
   |    |        |--- ejb2 *
   |    |                  |--- cache (for entity/sfsb) *
   |    |                  |--- pool (for slsb/mdb/entity) *
   |    |                  |--- methods
   |    |                       |--- method1 *
   |    |                       |--- method2 *
   |--- application2

The HTTP Service Tree

The nodes of the HTTP service are shown in the following schematic. The nodes at which monitoring information is available are marked with an asterisk (*). See HTTP Service Statistics.

Example 16–2 HTTP Service Schematic (Platform Edition version)

http-service
         |--- virtual-server-1
              |--- http-listener-1 *
              |--- http-listener-2 *
         |--- virtual-server-2
              |--- http-listener-1 *
              |--- http-listener-2 *

Example 16–3 HTTP Service Schematic (Enterprise Edition version)

http-service *
             |---connection-queue *
             |---dns *
             |---file-cache *
             |---keep-alive *
             |---pwc-thread-pool *
             |---virtual-server-1*
             |        |--- request *
             |---virtual-server-2*
             |        |--- request *

The Resources Tree

The resources node holds monitorable attributes for pools such as the JDBC connection pool and connector connection pool. The following schematic shows the top and child nodes for the various resource components. The nodes at which monitoring statistics are available are marked with an asterisk (*). See JDBC Connection Pools Statistics.

Example 16–4 Resources Schematic

resources
        |---connection-pool1(either connector-connection-pool or jdbc)*
        |---connection-pool2(either connector-connection-pool or jdbc)*

The Connector Service Tree

The connector services node holds monitorable attributes for pools such as the connector connection pool. The following schematic shows the top and child nodes for the various connector service components. The nodes at which monitoring statistics are available are marked with an asterisk (*). See JMS/Connector Service Statistics.

Example 16–5 Connector Service Schematic

connector-service
        |--- resource-adapter-1
        |        |-- connection-pools
        |        |        |-- pool-1 (All pool stats for this pool)
        |        |-- work-management (All work mgmt stats for this RA)

The JMS Service Tree

The JMS services node holds monitorable attributes for pools such as the connector connection pool. The following schematic shows the top and child nodes for the various JMS service components. The nodes at which monitoring statistics are available are marked with an asterisk (*).

Example 16–6 JMS Service Schematic

jms-service
        |-- connection-factories [AKA conn. pools in the RA world]
        |        |-- connection-factory-1 (All CF stats for this CF)
        |-- work-management (All work mgmt stats for the MQ-RA)

The ORB Tree

The ORB node holds monitorable attributes for connection managers. The following schematic shows the top and child nodes for the ORB components. The nodes at which monitoring statistics are available are marked with an asterisk (*). See Statistics for Connection Managers in an ORB.

Example 16–7 ORB Schematic

orb
        |--- connection-managers
        |        |--- connection-manager-1 *
        |        |--- connection-manager-1 *

The Thread Pool Tree

The thread pool node holds monitorable attributes for connection managers. The following schematic shows the top and child nodes for the ORB components. The nodes at which monitoring statistics are available are marked with an asterisk (*). See Thread Pools Statistics.

Example 16–8 Thread Pool Schematic

thread-pools
        |    |--- thread-pool-1 *
        |    |--- thread-pool-2 *

About Statistics for Monitored Components and Services

This section describes the monitoring statistics that are available:

EJB Container Statistics

EJB statistics are described in the following table.

Table 16–1 EJB Statistics


Attribute Name	Data Type	Description
`createcount`	CountStatistic	Number of times an EJB’s `create` method is called.
`removecount`	CountStatistic	Number of times an EJB’s `remove` method is called.
`pooledcount`	RangeStatistic	Number of entity beans in pooled state.
`readycount`	RangeStatistic	Number of entity beans in ready state.
`messagecount`	CountStatistic	Number of messages received for a message-driven bean.
`methodreadycount`	RangeStatistic	Number of stateful or stateless session beans that are in the `MethodReady` state.
`passivecount`	RangeStatistic	Number of stateful session beans that are in `Passive` state.

The statistics available for EJB method invocations are listed in the following table.

Table 16–2 EJB Method Statistics


Attribute Name	Data Type	Description
`methodstatistic`	TimeStatistic	Number of times an operation is called; the total time that is spent during the invocation, and so on.
`totalnumerrors`	CountStatistic	Number of times the method execution resulted in an exception. This is collected for stateless and stateful session beans and entity beans if monitoring is enabled for the EJB container.
`totalnumsuccess`	CountStatistic	Number of times the method successfully executed. This is collected for stateless and stateful session beans and entity beans if monitoring enabled is true for EJB container.
`executiontime`	CountStatistic	Time (ms) spent executing the method for the last successful/unsuccessful attempt to execute the operation. This is collected for stateless and stateful session beans and entity beans if monitoring is enabled on the EJB container.

The statistics for EJB Session Stores are listed in the following table.

Table 16–3 EJB Session Store Statistics


Attribute Name	Data Type	Description
`currentSize`	RangeStatistic	Number of passivated or checkpointed sessions currently in the store.
`activationCount`	CountStatistic	Number of sessions activated from the store.
`activationSuccessCount`	CountStatistic	Number of sessions successfully activated from the store
`activationErrorCount`	CountStatistic	Time (ms) spent executing the method for the last successful/unsuccessful attempt to execute the operation. This is collected for stateless and stateful session beans and entity beans, if monitoring is enabled on the EJB container.
`passivationCount`	CountStatistic	Number of sessions passivated (inactivated) using this store.
`passivationSuccessCount`	CountStatistic	Number of sessions successfully passivated using this store.
`passivationErrorCount`	CountStatistic	Number of sessions that could not be passivated using this store.
`expiredSessionCount`	CountStatistic	Number of expired sessions that were removed by this store.
`passivatedBeanSize`	CountStatistic	Total number of bytes passivated by this store, including total, minimum, and maximum.
`passivationTime`	CountStatistic	Time spent on passivating beans to the store, including the total, minimum, and maximum.
`checkpointCount (EE only)`	CountStatistic	Number of sessions checkpointed using this store.
`checkpointSuccessCount (EE only)`	CountStatistic	Number of sessions checkpointed successfully.
`checkpointErrorCount (EE only)`	CountStatistic	Number of sessions that couldn't be checkpointed.
`checkpointedBeanSize (EE only)`	ValueStatistic	Total number of beans checkpointed by the store.
`checkpointTime (EE only)`	TimeStatistic	Time spent on checkpointing beans to the store.

The statistics available for EJB pools are listed in the following table.

Table 16–4 EJB Pool Statistics


Attribute Name	Data Type	Description
`numbeansinpool`	BoundedRangeStatistic	Number of EJB’s in the associated pool, providing an idea about how the pool is changing.
`numthreadswaiting`	BoundedRangeStatistic	Number of threads waiting for free beans, giving an indication of possible congestion of requests.
`totalbeanscreated`	CountStatistic	Number of beans created in associated pool since the gathering of data started.
`totalbeansdestroyed`	CountStatistic	Number of beans destroyed from associated pool since the gathering of data started.
`jmsmaxmessagesload`	CountStatistic	The maximum number of messages to load into a JMS session at one time for a message-driven bean to serve. Default is 1. Applies only to pools for message driven beans.

The statistics available for EJB caches are listed in the following table.

Table 16–5 EJB Cache Statistics


Attribute Name	Data Type	Description
`cachemisses`	BoundedRangeStatistic	The number of times a user request does not find a bean in the cache.
`cachehits`	BoundedRangeStatistic	The number of times a user request found an entry in the cache.
`numbeansincache`	BoundedRangeStatistic	The number of beans in the cache. This is the current size of the cache.
`numpassivations`	CountStatistic	Number of passivated beans. Applies only to stateful session beans.
`numpassivationerrors`	CountStatistic	Number of errors during passivation. Applies only to stateful session beans.
`numexpiredsessionsremoved`	CountStatistic	Number of expired sessions removed by the cleanup thread. Applies only to stateful session beans.
`numpassivationsuccess`	CountStatistic	Number of times passivation completed successfully. Applies only to stateful session beans.

The statistics available for Timers are listed in the following table.

Table 16–6 Timer Statistics


Statistic	Data Type	Description
`numtimerscreated`	CountStatistic	Number of timers created in the system.
`numtimersdelivered`	CountStatistic	Number of timers delivered by the system.
`numtimersremoved`	CountStatistic	Number of timers removed from the system.

Web Container Statistics

The web container fits into the tree of objects as shown in The Applications Tree. Web container statistics are displayed for each individual web application. Statistics available for the web container for Servlets are shown in Web Container Statistics and statistics available for web modules are shown in Web Container Statistics.

Table 16–7 Web Container (Servlet) Statistics


Statistic	Units	Data Type	Comments
`errorcount`	Number	CountStatistic	Cumulative number of cases where the response code is greater than or equal to 400.
`maxtime`	Milliseconds	CountStatistic	The maximum amount of time the web container waits for requests.
`processingtime`	Milliseconds	CountStatistic	Cumulative value of the amount of time required to process each request. The processing time is the average of request processing times divided by the request count.
`requestcount`	Number	CountStatistic	The total number of requests processed so far.

Statistics available for web modules are shown in Web Container Statistics.

Table 16–8 Web Container (Web Module) Statistics


Statistic	Data Type	Comments
`jspcount`	CountStatistic	Number of JSP pages that have been loaded in the web module.
`jspreloadcount`	CountStatistic	Number of JSP pages that have been reloaded in the web module.
`sessionstotal`	CountStatistic	Total number of sessions that have been created for the web module.
`activesessionscurrent`	CountStatistic	Number of currently active sessions for the web module.
`activesessionshigh`	CountStatistic	Maximum number of concurrently active sessions for the web module.
`rejectedsessionstotal`	CountStatistic	Total number of rejected sessions for the web module. This is the number of sessions that were not created because the maximum allowed number of sessions were active.
`expiredsessionstotal`	CountStatistic	Total number of expired sessions for the web module.
`sessionsize (EE only)`	AverageRangeStatistic	Size of the session for the web module. Value is either high, low, or average, or is in bytes for serialized sessions.
`containerlatency (EE only)`	AverageRangeStatistic	Latency for the web container’s part of the overall latency request. Value is either high, low, or average.
`sessionpersisttime (EE only)`	AverageRangeStatistic	Time (in ms, low, high, or average) taken to persist HTTP session state to back-end store for the web module.
`cachedsessionscurrent (EE only)`	CountStatistic	Current number of sessions cached in memory for the web module.
`passivatedsessionscurrent (EE only)`	CountStatistic	Current number of sessions passivated for the web module.

HTTP Service Statistics

The statistics available for the HTTP service are shown in HTTP Service Statistics. These statistics are applicable to the Platform Edition only. For statistics for the HTTP Service on the Enterprise Edition, see Production Web Container (PWC) Statistics.

Table 16–9 HTTP Service Statistics (applicable to Platform Edition only)


Statistic	Units	Data Type	Comments
`bytesreceived`	Bytes	CountStatistic	The cumulative value of the bytes received by each of the request processors.
`bytessent`	Bytes	CountStatistic	The cumulative value of the bytes sent by each of the request processors.
`currentthreadcount`	Number	CountStatistic	The number of processing threads currently in the listener thread pool.
`currentthreadsbusy`	Number	CountStatistic	The number of request processing threads currently in use in the listener thread pool serving requests.
`errorcount`	Number	CountStatistic	The cumulative value of the error count, which represents the number of cases where the response code is greater than or equal to 400.
`maxsparethreads`	Number	CountStatistic	The maximum number of unused response processing threads that can exist.
`minsparethreads`	Number	CountStatistic	The minimum number of unused response processing threads that can exist.
`maxthreads`	Number	CountStatistic	The maximum number of request processing threads created by the listener.
`maxtime`	Milliseconds	CountStatistic	The maximum amount of time for processing threads.
`processing-time`	Milliseconds	CountStatistic	The cumulative value of the times taken to process each request. The processing time is the average of request processing times divided by the request count.
`request-count`	Number	CountStatistic	The total number of requests processed so far.

JDBC Connection Pools Statistics

Monitor JDBC resources to measure performance and capture resource usage at runtime. As the creation of JDBC connections are expensive and frequently cause performance bottlenecks in applications, it is crucial to monitor how a JDBC connection pool is releasing and creating new connections and how many threads are waiting to retrieve a connection from a particular pool.

The statistics available for the JDBC connection pool are shown in the following table.

Table 16–10 JDBC Connection Pool Statistics


Statistic	Units	Data Type	Description
`numconnfailedvalidation`	Number	CountStatistic	The total number of connections in the connection pool that failed validation from the start time until the last sample time.
`numconnused`	Number	RangeStatistic	Provides connection usage statistics. The total number of connections that are currently being used, as well as information about the maximum number of connections that were used (the high water mark).
`numconnfree`	Number	RangeStatistic	The total number of free connections in the pool as of the last sampling.
`numconntimedout`	Number	BoundedRangeStatistic	The total number of connections in the pool that timed out between the start time and the last sample time.
`averageconnwaittime`	Number	CountStatistic	Indicates the average wait time of connections for successful connection request attempts to the connector connection pool.
`waitqueuelength`	Number	CountStatistic	Number of connection requests in the queue waiting to be serviced.
`connectionrequestwaittime`		RangeStatistic	The longest and shortest wait times of connection requests. The current value indicates the wait time of the last request that was serviced by the pool.
`numconncreated`	Milliseconds	CountStatistic	The number of physical connections that were created since the last reset.
`numconndestroyed`	Number	CountStatistic	Number of physical connections that were destroyed since the last reset.
`numconnacquired`	Number	CountStatistic	Number of logical connections acquired from the pool.
`numconnreleased`	Number	CountStatistic	Number of logical connections released to the pool.

JMS/Connector Service Statistics

The statistics available for the connector connection pools are shown in JMS/Connector Service Statistics. Statistics for Connector Work Management are shown in JMS/Connector Service Statistics.

Table 16–11 Connector Connection Pool Statistics


Statistic	Units	Data Type	Description
`numconnfailedvalidation`	Number	CountStatistic	The total number of connections in the connection pool that failed validation from the start time until the last sample time.
`numconnused`	Number	RangeStatistic	Provides connection usage statistics. The total number of connections that are currently being used, as well as information about the maximum number of connections that were used (the high water mark).
`numconnfree`	Number	RangeStatistic	The total number of free connections in the pool as of the last sampling.
`numconntimedout`	Number	CountStatistic	The total number of connections in the pool that timed out between the start time and the last sample time.
`averageconnwaittime`	Number	CountStatistic	Average wait time of connections before they are serviced by the connection pool.
`waitqueuelenght`	Number	CountStatistic	Number of connection requests in the queue waiting to be serviced.
`connectionrequestwaittime`		RangeStatistic	The longest and shortest wait times of connection requests. The current value indicates the wait time of the last request that was serviced by the pool.
`numconncreated`	Milliseconds	CountStatistic	The number of physical connections that were created since the last reset.
`numconndestroyed`	Number	CountStatistic	Number of physical connections that were destroyed since the last reset.
`numconnacquired`	Number	CountStatistic	Number of logical connections acquired from the pool.
`numconnreleased`	Number	CountStatistic	Number of logical connections released to the pool.

Statistics available for Connector Work Management are listed in JMS/Connector Service Statistics.

Table 16–12 Connector Work Management Statistics


Statistic	Data Type	Description
`activeworkcount`	RangeStatistic	Number of work objects executed by the connector.
`waitqueuelength`	RangeStatistic	Number of work objects waiting in the queue before executing.
`workrequestwaittime`	RangeStatistic	Longest and shortest wait of a work object before it gets executed.
`submittedworkcount`	CountStatistic	Number of work objects submitted by a connector module.
`rejectedworkcount`	CountStatistic	Number of work objects rejected by the Application Server.
`completedworkcount`	CountStatistic	Number of work objects that were completed.

Statistics for Connection Managers in an ORB

The statistics available for the connection manager in an ORB are listed in Statistics for Connection Managers in an ORB.

Table 16–13 Connection Manager (in an ORB) Statistics


Statistic	Units	Data Type	Description
`connectionsidle`	Number	CountStatistic	Provides total number of connections that are idle to the ORB.
`connectionsinuse`	Number	CountStatistic	Provides total number of connections in use to the ORB.
`totalconnections`	Number	BoundedRangeStatistic	Total number of connections to the ORB.

Thread Pools Statistics

The statistics available for the thread pool are shown in the following table.

Table 16–14 Thread Pool Statistics


Statistic	Units	Data Type	Description
`averagetimeinqueue`	Milliseconds	RangeStatistic	The average amount of time in milliseconds a request waited in the queue before getting processed.
`averageworkcompletion-time`	Milliseconds	RangeStatistic	The average amount of time taken to complete an assignment, in milliseconds.
`currentnumberofthreads`	Number	BoundedRangeStatistic	Current number of request processing threads.
`numberofavailablethreads`	Number	CountStatistic	The number of threads that are available.
`numberofbusythreads`	Number	CountStatistic	The number of threads that are busy.
`totalworkitemsadded`	Number	CountStatistic	The total number of work items added so far to the work queue.

Transaction Service Statistics

The transaction service allows the client to freeze the transaction subsystem in order to roll back transactions and determine the transactions that are in process at the time of the freeze. The statistics available for the transaction service are shown in the following table.

Table 16–15 Transaction Service Statistics


Statistic	Data Type	Description
`activecount`	CountStatistic	Number of transactions currently active.
`activeids`	StringStatistic	The ID’s of the transactions that are currently active. Every such transaction can be rolled back after freezing the transaction service.
`committedcount`	CountStatistic	Number of transactions that have been committed.
`rolledbackcount`	CountStatistic	Number of transactions that have been rolled back.
`state`	StringStatistic	Indicates whether or not the transaction has been frozen.

Java Virtual Machine (JVM) Statistics

The JVM has monitorable attributes that are always enabled. The statistics available for the JVM are shown in the following table.

Table 16–16 JVM Statistics


Statistic	Data Type	Description
`heapsize`	BoundedRangeStatistic	The resident memory footprint with the higher and lower bounds of the JVM’s memory heap size.
`uptime`	CountStatistic	The amount of time the JVM has been running.

JVM Statistics in J2SE 5.0

If the Application Server is configured to run on J2SE version 5.0 or higher, 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 on the additional monitoring features available in J2SE 5.0 is available in a document titled Monitoring and Management for the Java Platform, which is available from http://java.sun.com/j2se/1.5.0/docs/guide/management/.

The J2SE 5.0 monitoring tools are discussed at http://java.sun.com/j2se/1.5.0/docs/tooldocs/#manage.

The statistics available for class loading in the JVM in J2SE 5.0 are shown in JVM Statistics in J2SE 5.0.

Table 16–17 JVM Statistics for J2SE 5.0 - 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 compilation in the JVM in J2SE 5.0 are shown in JVM Statistics in J2SE 5.0.

Table 16–18 JVM Statistics for J2SE 5.0 - Compilation


Statistic	Data Type	Description
`totalcompilationtime`	CountStatistic	Accumulated time (in milliseconds) spent in compilation.

The statistics available for garbage collection in the JVM in J2SE 5.0 are shown in JVM Statistics in J2SE 5.0.

Table 16–19 JVM Statistics for J2SE 5.0 - Garbage Collection


Statistic	Data Type	Description
`collectioncount`	CountStatistic	Total number of collections that have occurred.
`collectiontime`	CountStatistic	Accumulated collection time (in milliseconds).

The statistics available for memory in the JVM in J2SE 5.0 are shown in JVM Statistics in J2SE 5.0.

Table 16–20 JVM Statistics for J2SE 5.0 - Memory


Statistic	Data Type	Description
`objectpendingfinalizationcount`	CountStatistic	Approximate number of objects that are pending finalization.
`initheapsize`	CountStatistic	Size of the heap initially requested by the JVM.
`usedheapsize`	CountStatistic	Size of the heap currently in use.
`maxheapsize`	CountStatistic	Maximum amount of memory (in bytes) that can be used for memory management.
`committedheapsize`	CountStatistic	Amount of memory (in bytes) that is committed for the JVM to use.
`initnonheapsize`	CountStatistic	Size of the non-heap area initially requested by the JVM.
`usednonheapsize`	CountStatistic	Size of the non-heap area currently in use.
`maxnonheapsize`	CountStatistic	Maximum amount of memory (in bytes) that can be used for memory management.
`committednonheapsize`	CountStatistic	Amount of memory (in bytes) that is committed for the JVM to use.

The statistics available for the operating system in the JVM in J2SE 5.0 are shown in JVM Statistics in J2SE 5.0.

Table 16–21 JVM Statistics for J2SE 5.0 - Operating System


Statistic	Data Type	Description
`arch`	StringStatistic	Operating system architecture.
`availableprocessors`	CountStatistic	Number of processors available to the JVM.
`name`	StringStatistic	Operating system name.
`version`	StringStatistic	Operating system version.

The statistics available for the runtime in the JVM in J2SE 5.0 are shown in JVM Statistics in J2SE 5.0.

Table 16–22 JVM Statistics for J2SE 5.0 - Runtime


Statistic	Data Type	Description
`name`	StringStatistic	Name representing the running JVM
`vmname`	StringStatistic	JVM implementation name.
`vmvendor`	StringStatistic	JVM implementation vendor.
`vmversion`	StringStatistic	JVM implementation version.
`specname`	StringStatistic	JVM specification name.
`specvendor`	StringStatistic	JVM specification vendor.
`specversion`	StringStatistic	JVM specification version.
`managementspecversion`	StringStatistic	Management spec. version implemented by the JVM.
`classpath`	StringStatistic	Classpath that is used by the system class loader to search for class files.
`librarypath`	StringStatistic	Java library path.
`bootclasspath`	StringStatistic	Classpath that is used by the bootstrap class loader to search for class files.
`inputarguments`	StringStatistic	Input arguments passed to the JVM. Does not include the arguments to the `main` method.
`uptime`	CountStatistic	Uptime of the JVM (in milliseconds).

The statistics available for ThreadInfo in the JVM in J2SE 5.0 are shown in JVM Statistics in J2SE 5.0.

Table 16–23 JVM Statistics for J2SE 5.0 - Thread Info


Statistic	Data Type	Description
`threadid`	CountStatistic	Id of the thread.
`threadname`	StringStatistic	Name of the thread.
`threadstate`	StringStatistic	State of the thread.
`blockedtime`	CountStatistic	Time elapsed (in milliseconds) since the thread entered the `BLOCKED` state. Returns -1 if thread contention monitoring is disabled.
`blockedcount`	CountStatistic	Total number of times that the thread entered the `BLOCKED` state.
`waitedtime`	CountStatistic	Elapsed time (in milliseconds) that the thread has been in a `WAITING` state. Returns -1 if thread contention monitoring is disabled.
`waitedcount`	CountStatistic	Total number of times the thread was in `WAITING` or `TIMED_WAITING` states.
`lockname`	StringStatistic	String representation of the monitor lock that the thread is blocked to enter or waiting to be notified through the `Object.wait` method.
`lockownerid`	CountStatistic	Id of the thread that holds the monitor lock of an object on which this thread is blocking.
`lockownername`	StringStatistic	Name of the thread that holds the monitor lock of the object this thread is blocking on.
`stacktrace`	StringStatistic	Stack trace associated with this thread.

The statistics available for threads in the JVM in J2SE 5.0 are shown in JVM Statistics in J2SE 5.0.

Table 16–24 JVM Statistics for J2SE 5.0 - Threads


Statistic	Data Type	Description
`threadcount`	CountStatistic	Current number of live daemon and non-daemon threads.
`peakthreadcount`	CountStatistic	Peak live thread count since the JVM started or the peak was reset.
`totalstartedthreadcount`	CountStatistic	Total number of threads created and/or started since the JVM started.
`daemonthreadcount`	CountStatistic	Current number of live daemon threads.
`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.
`monitordeadlockedthreads`	StringStatistic	List of thread ids that are monitor deadlocked.

Production Web Container (PWC) Statistics

Statistics are available for the following PWC components and services on the Enterprise Edition (EE) of the Application Server:

Production Web Container (PWC) Statistics, PWC Virtual Server
Production Web Container (PWC) Statistics, PWC Request
Production Web Container (PWC) Statistics, PWC File Cache
Production Web Container (PWC) Statistics, PWC Keep Alive
Production Web Container (PWC) Statistics, PWC DNS
Admin Console Tasks for Listeners and JMX Connectors, PWC Thread Pool
Production Web Container (PWC) Statistics, PWC Connection Queue
Production Web Container (PWC) Statistics, PWC HTTP Service

Statistics for PWC virtual servers are listed in Production Web Container (PWC) Statistics.

Table 16–25 PWC Virtual Server Statistics (EE only)


Attribute Name	Data Type	Description
`id`	StringStatistic	The ID of the virtual server.
`mode`	StringStatistic	The mode the virtual server is in. Options include `unknown` or `active`.
`hosts`	StringStatistic	Name of the hosts serviced by this virtual server.
`interfaces`	StringStatistic	Type of interfaces (listeners) for which the virtual server is configured.

The statistics available for PWC requests are listed in the following table.

Table 16–26 PWC Request Statistics (EE only)


Attribute Name	Data Type	Description
`method`	StringStatistic	Method used for request.
`uri`	StringStatistic	Last URI served.
`countrequests`	CountStatistic	Number of requests served.
`countbytestransmitted`	CountStatistic	Number of bytes transmitted, or 0 if this information is not available
`countbytesreceived`	CountStatistic	Number of bytes received, or 0 if this information is not available.
`ratebytesreceived`	CountStatistic	Rate at which data was received over some server-defined interval, or 0 if this information is not available
`maxbytestransmissionrate`	CountStatistic	Maximum rate at which data was transmitted over some server-defined interval, or 0 if this information is not available.
`countopenconnections`	CountStatistic	Number of connections that are currently open, or 0 if this information is not available.
`maxopenconnections`	CountStatistic	Maximum number of concurrently open connections, or 0 if this information is not available.
`count2xx`	CountStatistic	Total number of responses of code 2XX.
`count3xx`	CountStatistic	Total number of responses of code 3XX.
`count4xx`	CountStatistic	Total number of responses of code 4XX.
`count5xx`	CountStatistic	Total number of responses of code 5XX.
`countother`	CountStatistic	Total number of responses with other response codes.
`count200`	CountStatistic	Total number of responses of code 200.
`count302`	CountStatistic	Total number of responses of code 302.
`count304`	CountStatistic	Total number of responses of code 304.
`count400`	CountStatistic	Total number of responses of code 400.
`count401`	CountStatistic	Total number of responses of code 401.
`count403`	CountStatistic	Total number of responses of code 403.
`count404`	CountStatistic	Total number of responses of code 404.
`count503`	CountStatistic	Total number of responses of code 503.

The cache information section provides information on how the file cache is being used. Statistics for PWC file caches are listed in the following table.

Table 16–27 PWC File Cache Statistics (EE only)


Attribute Name	Data Type	Description
`flagenabled`	CountStatistic	Indicates whether the file cache is enabled. Valid values are 0 for no or 1 for yes.
`secondsmaxage`	CountStatistic	Maximum age of a valid cache entry, in seconds.
`countentries`	CountStatistic	Number of current cache entries. A single cache entry represents a single URI.
`maxentries`	CountStatistic	Maximum number of simultaneous cache entries.
`countopenentries`	CountStatistic	Number of entries associated with an open file.
`maxopenentries`	CountStatistic	Maximum number of simultaneous cache entries associated with an open file.
`sizeheapcache`	CountStatistic	Heap space used for cache content.
`maxheapcachesize`	CountStatistic	Maximum heap space used for cache file content.
`sizemmapcache`	CountStatistic	Amount of address space used by memory mapped file content.
`maxmmapcachesize`	CountStatistic	Maximum amount of address space used by the file cache for memory mapped file content.
`counthits`	CountStatistic	Number of successful cache lookups.
`countmisses`	CountStatistic	Number of failed cache lookups.
`countinfohits`	CountStatistic	Number of times a file information lookup succeeded.
`countinfomisses`	CountStatistic	Number of misses on cached file information.
`countcontenthits`	CountStatistic	Number of hits on cached file content.
`countcontentmisses`	CountStatistic	Number of times a file information lookup failed.

This section provides information about the server's HTTP-level keep-alive system. The statistics available for PWC Keep Alive are listed in the following table.

Table 16–28 PWC Keep Alive Statistics (EE only)


Attribute Name	Data Type	Description
`countconnections`	CountStatistic	Number of connections in keep-alive mode.
`maxconnections`	CountStatistic	Maximum number of connections simultaneously allowed in keep-alive mode.
`counthits`	CountStatistic	The total number of times connections in keep-alive mode have subsequently made a valid request.
`countflushes`	CountStatistic	The number of times keep-alive connections have been closed by the server.
`countrefusals`	CountStatistic	The number of times the server could not hand off the connection to a keep-alive thread, possibly due to too many persistent connections.
`counttimeouts`	CountStatistic	The number of times the server terminated keep-alive connections as the client connections timed out without any activity.
`secondstimeout`	CountStatistic	The time (in seconds) before idle keep-alive connections are closed.

The DNS Cache caches IP addresses and DNS names. The server’s DNS cache is disabled by default. A single cache entry represents a singular IP address or DNS name lookup. The statistics available for PWC DNS are listed in the following table.

Table 16–29 PWC DNS Statistics (EE only)


Attribute Name	Data Type	Description
`flagcacheenabled`	CountStatistic	Indicates whether the DNS cache is enabled (on). Either 0 for off or 1 for on.
`countcacheentries`	CountStatistic	Number of DNS entries presently in the cache.
`maxcacheentries`	CountStatistic	Maximum number of DNS entries that can be accommodated by the cache.
`countcachehits`	CountStatistic	Number of times a DNS cache lookup has succeeded.
`countcachemisses`	CountStatistic	Number of times a DNS cache lookup has failed.
`flagasyncenabled`	CountStatistic	Indicates whether asynchronous DNS lookups are enabled (on). Either 0 for off or 1 for on.
`countasyncnamelookups`	CountStatistic	Total number of asynchronous DNS name lookups.
`countasyncaddrlookups`	CountStatistic	Total number of asynchronous DNS address lookups.
`countasynclookupsinprogress`	CountStatistic	Number of asynchronous lookups in progress.

Statistics for PWC thread pools are listed in the following table.

Table 16–30 PWC Thread Pool Statistics (EE only)


Attribute Name	Data Type	Description
`id`	StringStatistic	ID of the thread pool.
`countthreadsidle`	CountStatistic	Number of request-processing threads currently idle.
`countthreads`	CountStatistic	Current number of request-processing threads.
`maxthreads`	CountStatistic	Maximum number of request processing threads that can exist concurrently.
`countqueued`	CountStatistic	Number of requests queued for processing by this thread pool.
`peakqueued`	CountStatistic	The largest number of requests in the queue simultaneously.
`maxqueued`	CountStatistic	Maximum number of requests that can be in the queue at one time.

The Connection Queue is the queue in which requests are held prior to being serviced. Statistics for the connection queue show the number of sessions in the queue and the average delay before the connection is accepted. Statistics for PWC connection queues are listed in the following table.

Table 16–31 PWC Connection Queue Statistics (EE only)


Attribute Name	Data Type	Description
`id`	StringStatistic	ID of the connection queue.
`counttotalconnections`	CountStatistic	Total number of connections that have been accepted.
`countqueued`	CountStatistic	Number of connections currently in the queue.
`peakqueued`	CountStatistic	Largest number of connections that were in the queue simultaneously.
`maxqueued`	CountStatistic	Maximum size of the connection queue.
`countoverflows`	CountStatistic	The number of times the queue has been too full to accommodate a connection.
`counttotalqueued`	CountStatistic	The total number of connections that have been queued. A given connection may be queued multiple times, so `counttotalqueued` may be greater than or equal to `counttotalconnections`.
`tickstotalqueued`	CountStatistic	The total number of ticks that connections have spent in the queue. A tick is a system-dependent unit of time.
`countqueued1minuteaverage`	CountStatistic	Average number of connections queued in the last 1 minute.
`countqueued5minuteaverage`	CountStatistic	Average number of connections queued in the last 5 minutes.
`countqueued15minuteaverage`	CountStatistic	Average number of connections queued in the last 15 minutes.

Statistics for PWC HTTP service are listed in the following table.

Table 16–32 PWC HTTP Service Statistics (EE only)


Attribute Name	Data Type	Description
`id`	StringStatistic	Instance name of the HTTP service.
`versionserver`	StringStatistic	Version number of the HTTP service.
`timestarted`	StringStatistic	Time the HTTP service was started (GMT).
`secondsrunning`	CountStatistic	Time (in seconds) since the HTTP service started.
`maxthreads`	CountStatistic	Maximum number of worker threads in each instance.
`maxvirtualservers`	CountStatistic	Maximum number of virtual servers that can be configured in each instance.
`flagprofilingenabled`	CountStatistic	Whether or not HTTP service performance profiling is enabled. Valid values are 0 or 1.
`flagvirtualserveroverflow`	CountStatistic	Indicates whether more than `maxvirtualservers` are configured. If this is set to 1, statistics are not being tracked for all virtual servers.
`load1minuteaverage`	CountStatistic	Average load for requests in the last 1 minute.
`load5minuteaverage`	CountStatistic	Average load for requests in the last 5 minutes.
`load15minuteaverage`	CountStatistic	Average load for requests in the last 15 minutes.
`ratebytestransmitted`	CountStatistic	The rate at which data is transmitted over some server-defined interval. The result is 0 when this information is not available.
`ratebytesreceived`	CountStatistic	The rate at which data is received over some server-defined interval. The result is 0 when this information is not available.