Module java.management
Package java.lang.management

Interface RuntimeMXBean

All Superinterfaces:
PlatformManagedObject
public interface RuntimeMXBean extends PlatformManagedObject
The management interface for the runtime system of the Java virtual machine.

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:
ManagementFactory.getPlatformMXBeans(Class), JMX Specification., Ways to Access MXBeans

  • Method Summary

    Modifier and Type
    Method
    Description
    String
    getBootClassPath()
    Returns the boot class path that is used by the bootstrap class loader to search for class files.
    String
    getClassPath()
    Returns the Java class path that is used by the system class loader to search for class files.
    List<String>
    getInputArguments()
    Returns the input arguments passed to the Java virtual machine which does not include the arguments to the main method.
    String
    getLibraryPath()
    Returns the Java library path.
    String
    getManagementSpecVersion()
    Returns the version of the specification for the management interface implemented by the running Java virtual machine.
    String
    getName()
    Returns the name representing the running Java virtual machine.
    default long
    getPid()
    Returns the process ID representing the running Java virtual machine.
    String
    getSpecName()
    Returns the Java virtual machine specification name.
    String
    getSpecVendor()
    Returns the Java virtual machine specification vendor.
    String
    getSpecVersion()
    Returns the Java virtual machine specification version.
    long
    getStartTime()
    Returns the start time of the Java virtual machine in milliseconds.
    Map<String,​String>
    getSystemProperties()
    Returns a map of names and values of all system properties.
    long
    getUptime()
    Returns the uptime of the Java virtual machine in milliseconds.
    String
    getVmName()
    Returns the Java virtual machine implementation name.
    String
    getVmVendor()
    Returns the Java virtual machine implementation vendor.
    String
    getVmVersion()
    Returns the Java virtual machine implementation version.
    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.

    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 to System.getProperty("java.vm.name").
      Returns:
      the Java virtual machine implementation name.
      Throws:
      SecurityException - if a security manager exists and its checkPropertiesAccess method doesn't allow access to this system property.
      See Also:
      SecurityManager.checkPropertyAccess(java.lang.String), System.getProperty(java.lang.String)

    • getVmVendor

      String getVmVendor()
      Returns the Java virtual machine implementation vendor. This method is equivalent to System.getProperty("java.vm.vendor").
      Returns:
      the Java virtual machine implementation vendor.
      Throws:
      SecurityException - if a security manager exists and its checkPropertiesAccess method doesn't allow access to this system property.
      See Also:
      SecurityManager.checkPropertyAccess(java.lang.String), System.getProperty(java.lang.String)

    • getVmVersion

      String getVmVersion()
      Returns the Java virtual machine implementation version. This method is equivalent to System.getProperty("java.vm.version").
      Returns:
      the Java virtual machine implementation version.
      Throws:
      SecurityException - if a security manager exists and its checkPropertiesAccess method doesn't allow access to this system property.
      See Also:
      SecurityManager.checkPropertyAccess(java.lang.String), System.getProperty(java.lang.String)

    • getSpecName

      String getSpecName()
      Returns the Java virtual machine specification name. This method is equivalent to System.getProperty("java.vm.specification.name").
      Returns:
      the Java virtual machine specification name.
      Throws:
      SecurityException - if a security manager exists and its checkPropertiesAccess method doesn't allow access to this system property.
      See Also:
      SecurityManager.checkPropertyAccess(java.lang.String), System.getProperty(java.lang.String)

    • getSpecVendor

      String getSpecVendor()
      Returns the Java virtual machine specification vendor. This method is equivalent to System.getProperty("java.vm.specification.vendor").
      Returns:
      the Java virtual machine specification vendor.
      Throws:
      SecurityException - if a security manager exists and its checkPropertiesAccess method doesn't allow access to this system property.
      See Also:
      SecurityManager.checkPropertyAccess(java.lang.String), System.getProperty(java.lang.String)

    • getSpecVersion

      String getSpecVersion()
      Returns the Java virtual machine specification version. This method is equivalent to System.getProperty("java.vm.specification.version").
      Returns:
      the Java virtual machine specification version.
      Throws:
      SecurityException - if a security manager exists and its checkPropertiesAccess method doesn't allow access to this system property.
      See Also:
      SecurityManager.checkPropertyAccess(java.lang.String), System.getProperty(java.lang.String)

    • 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 to System.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 its checkPropertiesAccess method doesn't allow access to this system property.
      See Also:
      SecurityManager.checkPropertyAccess(java.lang.String), System.getProperty(java.lang.String)

    • getLibraryPath

      String getLibraryPath()
      Returns the Java library path. This method is equivalent to System.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 its checkPropertiesAccess method doesn't allow access to this system property.
      See Also:
      SecurityManager.checkPropertyAccess(java.lang.String), System.getProperty(java.lang.String)

    • 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

      List<String> getInputArguments()
      Returns the input arguments passed to the Java virtual machine which does not include the arguments to the main 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 of List<String> is String[].

      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

      Map<String,​String> getSystemProperties()
      Returns a map of names and values of all system properties. This method calls System.getProperties() to get all system properties. Properties whose name or value is not a String are omitted.

      MBeanServer access:
      The mapped type of Map<String,String> is TabularData with two items in each row as follows:

      Name and Type for each item
      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 its checkPropertiesAccess method doesn't allow access to the system properties.