MonitorNotification (Java Platform SE 8 )
Keywords: javax.management.monitor.MonitorNotification class
Date: 2026-03-16

compact3
javax.management.monitor

## Class MonitorNotification

- java.lang.Object
- - java.util.EventObject
  - - javax.management.Notification
    - - javax.management.monitor.MonitorNotification

- All Implemented Interfaces:
    Serializable

      public class MonitorNotification
      extends Notification

  Provides definitions of the notifications sent by monitor MBeans.

  The notification source and a set of parameters concerning the monitor MBean's state need to be specified when creating a new object of this class. The list of notifications fired by the monitor MBeans is the following:

  - Common to all kind of monitors:
    - The observed object is not registered in the MBean server.
    - The observed attribute is not contained in the observed object.
    - The type of the observed attribute is not correct.
    - Any exception (except the cases described above) occurs when trying to get the value of the observed attribute.
  - Common to the counter and the gauge monitors:
    - The threshold high or threshold low are not of the same type as the gauge (gauge monitors).
    - The threshold or the offset or the modulus are not of the same type as the counter (counter monitors).
  - Counter monitors only:
    - The observed attribute has reached the threshold value.
  - Gauge monitors only:
    - The observed attribute has exceeded the threshold high value.
    - The observed attribute has exceeded the threshold low value.
  - String monitors only:
    - The observed attribute has matched the "string to compare" value.
    - The observed attribute has differed from the "string to compare" value.
  Since:
    1.5
  See Also:
    Serialized Form

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static String` | `OBSERVED_ATTRIBUTE_ERROR` Notification type denoting that the observed attribute is not contained in the observed object.
    `static String` | `OBSERVED_ATTRIBUTE_TYPE_ERROR` Notification type denoting that the type of the observed attribute is not correct.
    `static String` | `OBSERVED_OBJECT_ERROR` Notification type denoting that the observed object is not registered in the MBean server.
    `static String` | `RUNTIME_ERROR` Notification type denoting that a non-predefined error type has occurred when trying to get the value of the observed attribute.
    `static String` | `STRING_TO_COMPARE_VALUE_DIFFERED` Notification type denoting that the observed attribute has differed from the "string to compare" value.
    `static String` | `STRING_TO_COMPARE_VALUE_MATCHED` Notification type denoting that the observed attribute has matched the "string to compare" value.
    `static String` | `THRESHOLD_ERROR` Notification type denoting that the type of the thresholds, offset or modulus is not correct.
    `static String` | `THRESHOLD_HIGH_VALUE_EXCEEDED` Notification type denoting that the observed attribute has exceeded the threshold high value.
    `static String` | `THRESHOLD_LOW_VALUE_EXCEEDED` Notification type denoting that the observed attribute has exceeded the threshold low value.
    `static String` | `THRESHOLD_VALUE_EXCEEDED` Notification type denoting that the observed attribute has reached the threshold value.

    - ### Fields inherited from class javax.management.Notification

      `source`

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `Object` | `getDerivedGauge()` Gets the derived gauge of this monitor notification.
    `String` | `getObservedAttribute()` Gets the observed attribute of this monitor notification.
    `ObjectName` | `getObservedObject()` Gets the observed object of this monitor notification.
    `Object` | `getTrigger()` Gets the threshold/string (depending on the monitor type) that triggered off this monitor notification.

    - ### Methods inherited from class javax.management.Notification

      `getMessage, getSequenceNumber, getTimeStamp, getType, getUserData, setSequenceNumber, setSource, setTimeStamp, setUserData, toString`

    - ### Methods inherited from class java.util.EventObject

      `getSource`

    - ### Methods inherited from class java.lang.Object

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

- - ### Field Detail

    - #### OBSERVED_OBJECT_ERROR

          public static final String OBSERVED_OBJECT_ERROR

      Notification type denoting that the observed object is not registered in the MBean server. This notification is fired by all kinds of monitors.
      The value of this notification type is `jmx.monitor.error.mbean`.
      See Also:
        Constant Field Values

    - #### OBSERVED_ATTRIBUTE_ERROR

          public static final String OBSERVED_ATTRIBUTE_ERROR

      Notification type denoting that the observed attribute is not contained in the observed object. This notification is fired by all kinds of monitors.
      The value of this notification type is `jmx.monitor.error.attribute`.
      See Also:
        Constant Field Values

    - #### OBSERVED_ATTRIBUTE_TYPE_ERROR

          public static final String OBSERVED_ATTRIBUTE_TYPE_ERROR

      Notification type denoting that the type of the observed attribute is not correct. This notification is fired by all kinds of monitors.
      The value of this notification type is `jmx.monitor.error.type`.
      See Also:
        Constant Field Values

    - #### THRESHOLD_ERROR

          public static final String THRESHOLD_ERROR

      Notification type denoting that the type of the thresholds, offset or modulus is not correct. This notification is fired by counter and gauge monitors.
      The value of this notification type is `jmx.monitor.error.threshold`.
      See Also:
        Constant Field Values

    - #### RUNTIME_ERROR

          public static final String RUNTIME_ERROR

      Notification type denoting that a non-predefined error type has occurred when trying to get the value of the observed attribute. This notification is fired by all kinds of monitors.
      The value of this notification type is `jmx.monitor.error.runtime`.
      See Also:
        Constant Field Values

    - #### THRESHOLD_VALUE_EXCEEDED

          public static final String THRESHOLD_VALUE_EXCEEDED

      Notification type denoting that the observed attribute has reached the threshold value. This notification is only fired by counter monitors.
      The value of this notification type is `jmx.monitor.counter.threshold`.
      See Also:
        Constant Field Values

    - #### THRESHOLD_HIGH_VALUE_EXCEEDED

          public static final String THRESHOLD_HIGH_VALUE_EXCEEDED

      Notification type denoting that the observed attribute has exceeded the threshold high value. This notification is only fired by gauge monitors.
      The value of this notification type is `jmx.monitor.gauge.high`.
      See Also:
        Constant Field Values

    - #### THRESHOLD_LOW_VALUE_EXCEEDED

          public static final String THRESHOLD_LOW_VALUE_EXCEEDED

      Notification type denoting that the observed attribute has exceeded the threshold low value. This notification is only fired by gauge monitors.
      The value of this notification type is `jmx.monitor.gauge.low`.
      See Also:
        Constant Field Values

    - #### STRING_TO_COMPARE_VALUE_MATCHED

          public static final String STRING_TO_COMPARE_VALUE_MATCHED

      Notification type denoting that the observed attribute has matched the "string to compare" value. This notification is only fired by string monitors.
      The value of this notification type is `jmx.monitor.string.matches`.
      See Also:
        Constant Field Values

    - #### STRING_TO_COMPARE_VALUE_DIFFERED

          public static final String STRING_TO_COMPARE_VALUE_DIFFERED

      Notification type denoting that the observed attribute has differed from the "string to compare" value. This notification is only fired by string monitors.
      The value of this notification type is `jmx.monitor.string.differs`.
      See Also:
        Constant Field Values

  - ### Method Detail

    - #### getObservedObject

          public ObjectName getObservedObject()

      Gets the observed object of this monitor notification.
      Returns:
        The observed object.

    - #### getObservedAttribute

          public String getObservedAttribute()

      Gets the observed attribute of this monitor notification.
      Returns:
        The observed attribute.

    - #### getDerivedGauge

          public Object getDerivedGauge()

      Gets the derived gauge of this monitor notification.
      Returns:
        The derived gauge.

    - #### getTrigger

          public Object getTrigger()

      Gets the threshold/string (depending on the monitor type) that triggered off this monitor notification.
      Returns:
        The trigger.

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