Interface RuntimeMXBean
- All Superinterfaces:
PlatformManagedObject
A Java virtual machine has a single instance of the implementation
class of this interface. This instance implementing this interface is
an MXBean
that can be obtained by calling
the ManagementFactory.getRuntimeMXBean()
method or
from the platform MBeanServer
method.
The ObjectName
for uniquely identifying the MXBean for
the runtime system within an MBeanServer is:
java.lang:type=Runtime
It can be obtained by calling the
PlatformManagedObject.getObjectName()
method.
This interface defines several convenient methods for accessing system properties about the Java virtual machine.
- Since:
- 1.5
- See Also:
-
Method Summary
Modifier and TypeMethodDescriptionReturns the boot class path that is used by the bootstrap class loader to search for class files.Returns the Java class path that is used by the system class loader to search for class files.Returns the input arguments passed to the Java virtual machine which does not include the arguments to themain
method.Returns the Java library path.Returns the version of the specification for the management interface implemented by the running Java virtual machine.getName()
Returns the name representing the running Java virtual machine.default long
getPid()
Returns the process ID representing the running Java virtual machine.Returns the Java virtual machine specification name.Returns the Java virtual machine specification vendor.Returns the Java virtual machine specification version.long
Returns the start time of the Java virtual machine in milliseconds.Returns a map of names and values of all system properties.long
Returns the uptime of the Java virtual machine in milliseconds.Returns the Java virtual machine implementation name.Returns the Java virtual machine implementation vendor.Returns the Java virtual machine implementation version.boolean
Tests if the Java virtual machine supports the boot class path mechanism used by the bootstrap class loader to search for class files.Methods declared in interface java.lang.management.PlatformManagedObject
getObjectName
-
Method Details
-
getPid
default long getPid()Returns the process ID representing the running Java virtual machine.- Implementation Requirements:
- The default implementation returns
process ID
of the current process. - Returns:
- the process ID representing the running Java virtual machine.
- Since:
- 10
-
getName
String getName()Returns the name representing the running Java virtual machine. The returned name string can be any arbitrary string and a Java virtual machine implementation can choose to embed platform-specific useful information in the returned name string. Each running virtual machine could have a different name.- Returns:
- the name representing the running Java virtual machine.
-
getVmName
String getVmName()Returns the Java virtual machine implementation name. This method is equivalent toSystem.getProperty("java.vm.name")
.- Returns:
- the Java virtual machine implementation name.
- Throws:
SecurityException
- if a security manager exists and itscheckPropertiesAccess
method doesn't allow access to this system property.- See Also:
-
getVmVendor
String getVmVendor()Returns the Java virtual machine implementation vendor. This method is equivalent toSystem.getProperty("java.vm.vendor")
.- Returns:
- the Java virtual machine implementation vendor.
- Throws:
SecurityException
- if a security manager exists and itscheckPropertiesAccess
method doesn't allow access to this system property.- See Also:
-
getVmVersion
String getVmVersion()Returns the Java virtual machine implementation version. This method is equivalent toSystem.getProperty("java.vm.version")
.- Returns:
- the Java virtual machine implementation version.
- Throws:
SecurityException
- if a security manager exists and itscheckPropertiesAccess
method doesn't allow access to this system property.- See Also:
-
getSpecName
String getSpecName()Returns the Java virtual machine specification name. This method is equivalent toSystem.getProperty("java.vm.specification.name")
.- Returns:
- the Java virtual machine specification name.
- Throws:
SecurityException
- if a security manager exists and itscheckPropertiesAccess
method doesn't allow access to this system property.- See Also:
-
getSpecVendor
String getSpecVendor()Returns the Java virtual machine specification vendor. This method is equivalent toSystem.getProperty("java.vm.specification.vendor")
.- Returns:
- the Java virtual machine specification vendor.
- Throws:
SecurityException
- if a security manager exists and itscheckPropertiesAccess
method doesn't allow access to this system property.- See Also:
-
getSpecVersion
String getSpecVersion()Returns the Java virtual machine specification version. This method is equivalent toSystem.getProperty("java.vm.specification.version")
.- Returns:
- the Java virtual machine specification version.
- Throws:
SecurityException
- if a security manager exists and itscheckPropertiesAccess
method doesn't allow access to this system property.- See Also:
-
getManagementSpecVersion
String getManagementSpecVersion()Returns the version of the specification for the management interface implemented by the running Java virtual machine.- Returns:
- the version of the specification for the management interface implemented by the running Java virtual machine.
-
getClassPath
String getClassPath()Returns the Java class path that is used by the system class loader to search for class files. This method is equivalent toSystem.getProperty("java.class.path")
.Multiple paths in the Java class path are separated by the path separator character of the platform of the Java virtual machine being monitored.
- Returns:
- the Java class path.
- Throws:
SecurityException
- if a security manager exists and itscheckPropertiesAccess
method doesn't allow access to this system property.- See Also:
-
getLibraryPath
String getLibraryPath()Returns the Java library path. This method is equivalent toSystem.getProperty("java.library.path")
.Multiple paths in the Java library path are separated by the path separator character of the platform of the Java virtual machine being monitored.
- Returns:
- the Java library path.
- Throws:
SecurityException
- if a security manager exists and itscheckPropertiesAccess
method doesn't allow access to this system property.- See Also:
-
isBootClassPathSupported
boolean isBootClassPathSupported()Tests if the Java virtual machine supports the boot class path mechanism used by the bootstrap class loader to search for class files.- Returns:
true
if the Java virtual machine supports the class path mechanism;false
otherwise.
-
getBootClassPath
String getBootClassPath()Returns the boot class path that is used by the bootstrap class loader to search for class files.Multiple paths in the boot class path are separated by the path separator character of the platform on which the Java virtual machine is running.
A Java virtual machine implementation may not support the boot class path mechanism for the bootstrap class loader to search for class files. The
isBootClassPathSupported()
method can be used to determine if the Java virtual machine supports this method.- Returns:
- the boot class path.
- Throws:
UnsupportedOperationException
- if the Java virtual machine does not support this operation.SecurityException
- if a security manager exists and the caller does not have ManagementPermission("monitor").
-
getInputArguments
Returns the input arguments passed to the Java virtual machine which does not include the arguments to themain
method. This method returns an empty list if there is no input argument to the Java virtual machine.Some Java virtual machine implementations may take input arguments from multiple different sources: for examples, arguments passed from the application that launches the Java virtual machine such as the 'java' command, environment variables, configuration files, etc.
Typically, not all command-line options to the 'java' command are passed to the Java virtual machine. Thus, the returned input arguments may not include all command-line options.
MBeanServer access:
The mapped type ofList<String>
isString[]
.- Returns:
- a list of
String
objects; each element is an argument passed to the Java virtual machine. - Throws:
SecurityException
- if a security manager exists and the caller does not have ManagementPermission("monitor").
-
getUptime
long getUptime()Returns the uptime of the Java virtual machine in milliseconds.- Returns:
- uptime of the Java virtual machine in milliseconds.
-
getStartTime
long getStartTime()Returns the start time of the Java virtual machine in milliseconds. This method returns the approximate time when the Java virtual machine started.- Returns:
- start time of the Java virtual machine in milliseconds.
-
getSystemProperties
Returns a map of names and values of all system properties. This method callsSystem.getProperties()
to get all system properties. Properties whose name or value is not aString
are omitted.MBeanServer access:
The mapped type ofMap<String,String>
isTabularData
with two items in each row as follows:Item Name Item Type key
String
value
String
- Returns:
- a map of names and values of all system properties.
- Throws:
SecurityException
- if a security manager exists and itscheckPropertiesAccess
method doesn't allow access to the system properties.
-