Package org.apache.tomcat.util

Class Diagnostics

java.lang.Object

org.apache.tomcat.util.Diagnostics

public class Diagnostics
extends Object

Constructor Summary

Constructors

Constructor	Description
Diagnostics()

Method Summary

Modifier and Type	Method	Description
static String	findDeadlock()	Check if any threads are deadlocked.
static void	gc()	Initiate garbage collection via MX Bean
static String	getThreadDump()	Retrieves a formatted JVM thread dump.
static String	getThreadDump(Enumeration<Locale> requestedLocales)	Retrieves a formatted JVM thread dump.
static String	getThreadDump(StringManager requestedSm)	Retrieve a JVM thread dump formatted using the given StringManager.
static String	getVMInfo()	Retrieves a formatted JVM information text.
static String	getVMInfo(Enumeration<Locale> requestedLocales)	Retrieves a formatted JVM information text.
static String	getVMInfo(StringManager requestedSm)	Retrieve a JVM information text formatted using the given StringManager.
static boolean	isThreadContentionMonitoringEnabled()	Check whether thread contention monitoring is enabled.
static boolean	isThreadCpuTimeEnabled()	Check whether thread cpu time measurement is enabled.
static void	resetPeakThreadCount()	Reset peak thread count in ThreadMXBean
static void	resetPeakUsage(String name)	Reset peak memory usage data in MemoryPoolMXBean
static boolean	setCollectionUsageThreshold(String name, long threshold)	Set collection usage threshold in MemoryPoolMXBean
static void	setLoggerLevel(String loggerName, String levelName)	Set logger level
static void	setThreadContentionMonitoringEnabled(boolean enable)	Enable or disable thread contention monitoring via the ThreadMxMXBean.
static void	setThreadCpuTimeEnabled(boolean enable)	Enable or disable thread cpu time measurement via the ThreadMxMXBean.
static boolean	setUsageThreshold(String name, long threshold)	Set usage threshold in MemoryPoolMXBean
static void	setVerboseClassLoading(boolean verbose)	Set verbose class loading
static void	setVerboseGarbageCollection(boolean verbose)	Set verbose garbage collection logging

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

Diagnostics

public Diagnostics()

Method Details

isThreadContentionMonitoringEnabled

public static boolean isThreadContentionMonitoringEnabled()

Check whether thread contention monitoring is enabled.

Returns:

true if thread contention monitoring is enabled

setThreadContentionMonitoringEnabled

public static void setThreadContentionMonitoringEnabled(boolean enable)

Enable or disable thread contention monitoring via the ThreadMxMXBean.

Parameters:

enable - whether to enable thread contention monitoring

isThreadCpuTimeEnabled

public static boolean isThreadCpuTimeEnabled()

Check whether thread cpu time measurement is enabled.

Returns:

true if thread cpu time measurement is enabled

setThreadCpuTimeEnabled

public static void setThreadCpuTimeEnabled(boolean enable)

Enable or disable thread cpu time measurement via the ThreadMxMXBean.

Parameters:

enable - whether to enable thread cpu time measurement

resetPeakThreadCount

public static void resetPeakThreadCount()

Reset peak thread count in ThreadMXBean

setVerboseClassLoading

public static void setVerboseClassLoading(boolean verbose)

Set verbose class loading

Parameters:

verbose - whether to enable verbose class loading

setLoggerLevel

public static void setLoggerLevel(String loggerName,
 String levelName)

Set logger level

Parameters:

loggerName - the name of the logger

levelName - the level to set

setVerboseGarbageCollection

public static void setVerboseGarbageCollection(boolean verbose)

Set verbose garbage collection logging

Parameters:

verbose - whether to enable verbose gc logging

gc

public static void gc()

Initiate garbage collection via MX Bean

resetPeakUsage

public static void resetPeakUsage(String name)

Reset peak memory usage data in MemoryPoolMXBean

Parameters:

name - name of the MemoryPoolMXBean or "all"

setUsageThreshold

public static boolean setUsageThreshold(String name,
 long threshold)

Set usage threshold in MemoryPoolMXBean

Parameters:

name - name of the MemoryPoolMXBean

threshold - the threshold to set

Returns:

true if setting the threshold succeeded

setCollectionUsageThreshold

public static boolean setCollectionUsageThreshold(String name,
 long threshold)

Set collection usage threshold in MemoryPoolMXBean

Parameters:

name - name of the MemoryPoolMXBean

threshold - the collection threshold to set

Returns:

true if setting the threshold succeeded

findDeadlock

public static String findDeadlock()

Check if any threads are deadlocked. If any, print the thread dump for those threads.

Returns:

a deadlock message and the formatted thread dump of the deadlocked threads

getThreadDump

public static String getThreadDump()

Retrieves a formatted JVM thread dump. The default StringManager will be used.

Returns:

the formatted JVM thread dump

getThreadDump

public static String getThreadDump(Enumeration<Locale> requestedLocales)

Retrieves a formatted JVM thread dump. The given list of locales will be used to retrieve a StringManager.

Parameters:

requestedLocales - list of locales to use

Returns:

the formatted JVM thread dump

getThreadDump

public static String getThreadDump(StringManager requestedSm)

Retrieve a JVM thread dump formatted using the given StringManager.

Parameters:

requestedSm - the StringManager to use

Returns:

the formatted JVM thread dump

getVMInfo

public static String getVMInfo()

Retrieves a formatted JVM information text. The default StringManager will be used.

Returns:

the formatted JVM information text

getVMInfo

public static String getVMInfo(Enumeration<Locale> requestedLocales)

Retrieves a formatted JVM information text. The given list of locales will be used to retrieve a StringManager.

Parameters:

requestedLocales - list of locales to use

Returns:

the formatted JVM information text

getVMInfo

public static String getVMInfo(StringManager requestedSm)

Retrieve a JVM information text formatted using the given StringManager.

Parameters:

requestedSm - the StringManager to use

Returns:

the formatted JVM information text