Interface: javax.management.MBeanServer
- public interface MBeanServer
- implements MBeanServerConnection
This is the interface for MBean manipulation on the agent side. It contains the methods necessary for the creation, registration, and deletion of MBeans as well as the access methods for registered MBeans. This is the core component of the JMX infrastructure.
User code does not usually implement this interface. Instead, an object that implements this interface is obtained with one of the methods in the javax.management.MBeanServerFactory class.
Every MBean which is added to the MBean server becomes manageable: its attributes and operations become remotely accessible through the connectors/adaptors connected to that MBean server. A Java object cannot be registered in the MBean server unless it is a JMX compliant MBean.
When an MBean is registered or unregistered in the MBean server
a MBeanServerNotification Notification is emitted. To register an
object as listener to MBeanServerNotifications you should call the
MBean server method addNotificationListener with ObjectName the
ObjectName of the MBeanServerDelegate. This
ObjectName is:
JMImplementation:type=MBeanServerDelegate.
An object obtained from the createMBeanServer or newMBeanServer methods of the javax.management.MBeanServerFactory class applies security checks to its methods, as follows.
First, if there is no security manager (System.getSecurityManager() is null), then an implementation of this interface is free not to make any checks.
Assuming that there is a security manager, or that the
implementation chooses to make checks anyway, the checks are made
as detailed below. In what follows, className is the
string returned by javax.management.MBeanInfo.getClassName() for the target
MBean.
If a security check fails, the method throws SecurityException.
For methods that can throw javax.management.InstanceNotFoundException,
this exception is thrown for a non-existent MBean, regardless of
permissions. This is because a non-existent MBean has no
className.
For the invoke method, the caller's permissions must imply MBeanPermission(className, operationName, name, "invoke").
For the getAttribute method, the caller's permissions must imply MBeanPermission(className, attribute, name, "getAttribute").
For the getAttributes method, the caller's permissions must imply MBeanPermission(className, null, name, "getAttribute"). Additionally, for each attribute a in the javax.management.AttributeList, if the caller's permissions do not imply MBeanPermission(className, a, name, "getAttribute"), the MBean server will behave as if that attribute had not been in the supplied list.
For the setAttribute method, the caller's permissions must imply MBeanPermission(className, attrName, name, "setAttribute"), where
attrNameis attribute.getName().For the setAttributes method, the caller's permissions must imply MBeanPermission(className, null, name, "setAttribute"). Additionally, for each attribute a in the javax.management.AttributeList, if the caller's permissions do not imply MBeanPermission(className, a, name, "setAttribute"), the MBean server will behave as if that attribute had not been in the supplied list.
For the
addNotificationListenermethods, the caller's permissions must imply MBeanPermission(className, null, name, "addNotificationListener").For the
removeNotificationListenermethods, the caller's permissions must imply MBeanPermission(className, null, name, "removeNotificationListener").For the getMBeanInfo method, the caller's permissions must imply MBeanPermission(className, null, name, "getMBeanInfo").
For the getObjectInstance method, the caller's permissions must imply MBeanPermission(className, null, name, "getObjectInstance").
For the isInstanceOf method, the caller's permissions must imply MBeanPermission(className, null, name, "isInstanceOf").
For the queryMBeans method, the caller's permissions must imply MBeanPermission(null, null, name, "queryMBeans"). Additionally, for each MBean that matches
name, if the caller's permissions do not imply MBeanPermission(className, null, name, "queryMBeans"), the MBean server will behave as if that MBean did not exist.Certain query elements perform operations on the MBean server. If the caller does not have the required permissions for a given MBean, that MBean will not be included in the result of the query. The standard query elements that are affected are javax.management.Query.attr(java.lang.String), javax.management.Query.attr(java.lang.String, java.lang.String), and javax.management.Query.classattr().
For the queryNames method, the checks are the same as for
queryMBeansexcept that"queryNames"is used instead of"queryMBeans"in theMBeanPermissionobjects. Note that a"queryMBeans"permission implies the corresponding"queryNames"permission.For the getDomains method, the caller's permissions must imply MBeanPermission(null, null, name, "getDomains"). Additionally, for each domain d in the returned array, if the caller's permissions do not imply MBeanPermission(null, null, new ObjectName("d:x=x"), "getDomains"), the domain is eliminated from the array. Here,
x=xis any key=value pair, needed to satisfy ObjectName's constructor but not otherwise relevant.For the getClassLoader method, the caller's permissions must imply MBeanPermission(className, null, loaderName, "getClassLoader").
For the getClassLoaderFor method, the caller's permissions must imply MBeanPermission(className, null, mbeanName, "getClassLoaderFor").
For the getClassLoaderRepository method, the caller's permissions must imply MBeanPermission(null, null, null, "getClassLoaderRepository").
For the deprecated
deserializemethods, the required permissions are the same as for the methods that replace them.For the
instantiatemethods, the caller's permissions must imply MBeanPermission(className, null, null, "instantiate").For the registerMBean method, the caller's permissions must imply MBeanPermission(className, null, name, "registerMBean"). Here
classNameis the string returned by javax.management.MBeanInfo.getClassName() for an object of this class.If the
MBeanPermissioncheck succeeds, the MBean's class is validated by checking that its ProtectionDomain implies MBeanTrustPermission("register").Finally, if the
nameargument is null, anotherMBeanPermissioncheck is made using theObjectNamereturned by MBeanRegistration.preRegister.For the
createMBeanmethods, the caller's permissions must imply the permissions needed by the equivalentinstantiatefollowed byregisterMBean.For the unregisterMBean method, the caller's permissions must imply MBeanPermission(className, null, name, "unregisterMBean").
Methods
-
addNotificationListenertop
public void addNotificationListener(ObjectName name, NotificationListener listener, NotificationFilter filter, Object handback) throws InstanceNotFoundExceptionAdds a listener to a registered MBean.
A notification emitted by an MBean will be forwarded by the MBeanServer to the listener. If the source of the notification is a reference to an MBean object, the MBean server will replace it by that MBean's ObjectName. Otherwise the source is unchanged.
- Specified by:
- addNotificationListener from MBeanServerConnection
-
addNotificationListenertop
public void addNotificationListener(ObjectName name, ObjectName listener, NotificationFilter filter, Object handback) throws InstanceNotFoundExceptionAdds a listener to a registered MBean.
A notification emitted by an MBean will be forwarded by the MBeanServer to the listener. If the source of the notification is a reference to an MBean object, the MBean server will replace it by that MBean's ObjectName. Otherwise the source is unchanged.
The listener object that receives notifications is the one that is registered with the given name at the time this method is called. Even if it is subsequently unregistered, it will continue to receive notifications.
- Specified by:
- addNotificationListener from MBeanServerConnection
-
createMBeantop
public ObjectInstance createMBean(String className, ObjectName name) throws ReflectionException, InstanceAlreadyExistsException, MBeanRegistrationException, MBeanException, NotCompliantMBeanExceptionInstantiates and registers an MBean in the MBean server. The MBean server will use its Default Loader Repository to load the class of the MBean. An object name is associated to the MBean. If the object name given is null, the MBean must provide its own name by implementing the MBeanRegistration interface and returning the name from the preRegister method.
This method is equivalent to createMBean(className, name, (Object[]) null, (String[]) null).
- Specified by:
- createMBean from MBeanServerConnection
-
createMBeantop
public ObjectInstance createMBean(String className, ObjectName name, ObjectName loaderName) throws ReflectionException, InstanceAlreadyExistsException, MBeanRegistrationException, MBeanException, NotCompliantMBeanException, InstanceNotFoundExceptionInstantiates and registers an MBean in the MBean server. The class loader to be used is identified by its object name. An object name is associated to the MBean. If the object name of the loader is null, the ClassLoader that loaded the MBean server will be used. If the MBean's object name given is null, the MBean must provide its own name by implementing the MBeanRegistration interface and returning the name from the preRegister method.
This method is equivalent to createMBean(className, name, loaderName, (Object[]) null, (String[]) null).
- Specified by:
- createMBean from MBeanServerConnection
-
createMBeantop
public ObjectInstance createMBean(String className, ObjectName name, ObjectName loaderName, Object[] params, String[] signature) throws ReflectionException, InstanceAlreadyExistsException, MBeanRegistrationException, MBeanException, NotCompliantMBeanException, InstanceNotFoundExceptionInstantiates and registers an MBean in the MBean server. The class loader to be used is identified by its object name. An object name is associated to the MBean. If the object name of the loader is not specified, the ClassLoader that loaded the MBean server will be used. If the MBean object name given is null, the MBean must provide its own name by implementing the MBeanRegistration interface and returning the name from the preRegister method.- Specified by:
- createMBean from MBeanServerConnection
-
createMBeantop
public ObjectInstance createMBean(String className, ObjectName name, Object[] params, String[] signature) throws ReflectionException, InstanceAlreadyExistsException, MBeanRegistrationException, MBeanException, NotCompliantMBeanExceptionInstantiates and registers an MBean in the MBean server. The MBean server will use its Default Loader Repository to load the class of the MBean. An object name is associated to the MBean. If the object name given is null, the MBean must provide its own name by implementing the MBeanRegistration interface and returning the name from the preRegister method.- Specified by:
- createMBean from MBeanServerConnection
-
deserializetop
public ObjectInputStream deserialize(String className, ObjectName loaderName, byte[] data) throws InstanceNotFoundException, OperationsException, ReflectionExceptionDe-serializes a byte array in the context of a given MBean class loader. The class loader is the one that loaded the class with name "className". The name of the class loader to be used for loading the specified class is specified. If null, the MBean Server's class loader will be used.
-
deserializetop
public ObjectInputStream deserialize(String className, byte[] data) throws OperationsException, ReflectionExceptionDe-serializes a byte array in the context of a given MBean class loader. The class loader is found by loading the class
classNamethrough the Class Loader Repository. The resultant class's class loader is the one to use. -
deserializetop
public ObjectInputStream deserialize(ObjectName name, byte[] data) throws InstanceNotFoundException, OperationsExceptionDe-serializes a byte array in the context of the class loader of an MBean.
-
getAttributetop
public Object getAttribute(ObjectName name, String attribute) throws MBeanException, AttributeNotFoundException, InstanceNotFoundException, ReflectionExceptionGets the value of a specific attribute of a named MBean. The MBean is identified by its object name.- Specified by:
- getAttribute from MBeanServerConnection
-
getAttributestop
public AttributeList getAttributes(ObjectName name, String[] attributes) throws InstanceNotFoundException, ReflectionExceptionEnables the values of several attributes of a named MBean. The MBean is identified by its object name.- Specified by:
- getAttributes from MBeanServerConnection
-
getClassLoadertop
Return the named ClassLoader.
-
getClassLoaderFortop
Return the ClassLoader that was used for loading the class of the named MBean.
-
getClassLoaderRepositorytop
public ClassLoaderRepository getClassLoaderRepository()Return the ClassLoaderRepository for this MBeanServer.
-
getDefaultDomaintop
public String getDefaultDomain()Returns the default domain used for naming the MBean. The default domain name is used as the domain part in the ObjectName of MBeans if no domain is specified by the user.- Specified by:
- getDefaultDomain from MBeanServerConnection
-
getDomainstop
public String[] getDomains()Returns the list of domains in which any MBean is currently registered. A string is in the returned array if and only if there is at least one MBean registered with an ObjectName whose getDomain() is equal to that string. The order of strings within the returned array is not defined.
- Specified by:
- getDomains from MBeanServerConnection
-
getMBeanCounttop
public Integer getMBeanCount()Returns the number of MBeans registered in the MBean server.- Specified by:
- getMBeanCount from MBeanServerConnection
-
getMBeanInfotop
public MBeanInfo getMBeanInfo(ObjectName name) throws InstanceNotFoundException, IntrospectionException, ReflectionExceptionThis method discovers the attributes and operations that an MBean exposes for management.- Specified by:
- getMBeanInfo from MBeanServerConnection
-
getObjectInstancetop
Gets theObjectInstancefor a given MBean registered with the MBean server.- Specified by:
- getObjectInstance from MBeanServerConnection
-
instantiatetop
Instantiates an object using the list of all class loaders registered in the MBean server's Class Loader Repository. The object's class should have a public constructor. This method returns a reference to the newly created object. The newly created object is not registered in the MBean server.
This method is equivalent to instantiate(className, (Object[]) null, (String[]) null).
-
instantiatetop
public Object instantiate(String className, ObjectName loaderName) throws ReflectionException, MBeanException, InstanceNotFoundExceptionInstantiates an object using the class Loader specified by its
ObjectName. If the loader name is null, the ClassLoader that loaded the MBean Server will be used. The object's class should have a public constructor. This method returns a reference to the newly created object. The newly created object is not registered in the MBean server.This method is equivalent to instantiate(className, loaderName, (Object[]) null, (String[]) null).
-
instantiatetop
public Object instantiate(String className, ObjectName loaderName, Object[] params, String[] signature) throws ReflectionException, MBeanException, InstanceNotFoundExceptionInstantiates an object. The class loader to be used is identified by its object name. If the object name of the loader is null, the ClassLoader that loaded the MBean server will be used. The object's class should have a public constructor. The call returns a reference to the newly created object. The newly created object is not registered in the MBean server.
-
instantiatetop
public Object instantiate(String className, Object[] params, String[] signature) throws ReflectionException, MBeanExceptionInstantiates an object using the list of all class loaders registered in the MBean server Class Loader Repository. The object's class should have a public constructor. The call returns a reference to the newly created object. The newly created object is not registered in the MBean server.
-
invoketop
public Object invoke(ObjectName name, String operationName, Object[] params, String[] signature) throws InstanceNotFoundException, MBeanException, ReflectionExceptionInvokes an operation on an MBean.- Specified by:
- invoke from MBeanServerConnection
-
isInstanceOftop
Returns true if the MBean specified is an instance of the specified class, false otherwise.
If
namedoes not name an MBean, this method throws javax.management.InstanceNotFoundException.Otherwise, let
X be the MBean named byname,
L be the ClassLoader of X,
N be the class name in X's javax.management.MBeanInfo.If N equals
className, the result is true.Otherwise, if L successfully loads
classNameand X is an instance of this class, the result is true.Otherwise, if L successfully loads both N and
className, and the second class is assignable from the first, the result is true.Otherwise, the result is false.
- Specified by:
- isInstanceOf from MBeanServerConnection
-
isRegisteredtop
public boolean isRegistered(ObjectName name)Checks whether an MBean, identified by its object name, is already registered with the MBean server.- Specified by:
- isRegistered from MBeanServerConnection
-
queryMBeanstop
Gets MBeans controlled by the MBean server. This method allows any of the following to be obtained: All MBeans, a set of MBeans specified by pattern matching on theObjectNameand/or a Query expression, a specific MBean. When the object name is null or no domain and key properties are specified, all objects are to be selected (and filtered if a query is specified). It returns the set ofObjectInstanceobjects (containing theObjectNameand the Java Class name) for the selected MBeans.- Specified by:
- queryMBeans from MBeanServerConnection
-
queryNamestop
Gets the names of MBeans controlled by the MBean server. This method enables any of the following to be obtained: The names of all MBeans, the names of a set of MBeans specified by pattern matching on theObjectNameand/or a Query expression, a specific MBean name (equivalent to testing whether an MBean is registered). When the object name is null or no domain and key properties are specified, all objects are selected (and filtered if a query is specified). It returns the set of ObjectNames for the MBeans selected.- Specified by:
- queryNames from MBeanServerConnection
-
registerMBeantop
public ObjectInstance registerMBean(Object object, ObjectName name) throws InstanceAlreadyExistsException, MBeanRegistrationException, NotCompliantMBeanExceptionRegisters a pre-existing object as an MBean with the MBean server. If the object name given is null, the MBean must provide its own name by implementing the MBeanRegistration interface and returning the name from the preRegister method. -
removeNotificationListenertop
public void removeNotificationListener(ObjectName name, NotificationListener listener) throws InstanceNotFoundException, ListenerNotFoundExceptionRemoves a listener from a registered MBean.
If the listener is registered more than once, perhaps with different filters or callbacks, this method will remove all those registrations.
- Specified by:
- removeNotificationListener from MBeanServerConnection
-
removeNotificationListenertop
public void removeNotificationListener(ObjectName name, NotificationListener listener, NotificationFilter filter, Object handback) throws InstanceNotFoundException, ListenerNotFoundExceptionRemoves a listener from a registered MBean.
The MBean must have a listener that exactly matches the given
listener,filter, andhandbackparameters. If there is more than one such listener, only one is removed.The
filterandhandbackparameters may be null if and only if they are null in a listener to be removed.- Specified by:
- removeNotificationListener from MBeanServerConnection
-
removeNotificationListenertop
public void removeNotificationListener(ObjectName name, ObjectName listener) throws InstanceNotFoundException, ListenerNotFoundExceptionRemoves a listener from a registered MBean.If the listener is registered more than once, perhaps with different filters or callbacks, this method will remove all those registrations.
- Specified by:
- removeNotificationListener from MBeanServerConnection
-
removeNotificationListenertop
public void removeNotificationListener(ObjectName name, ObjectName listener, NotificationFilter filter, Object handback) throws InstanceNotFoundException, ListenerNotFoundExceptionRemoves a listener from a registered MBean.
The MBean must have a listener that exactly matches the given
listener,filter, andhandbackparameters. If there is more than one such listener, only one is removed.The
filterandhandbackparameters may be null if and only if they are null in a listener to be removed.- Specified by:
- removeNotificationListener from MBeanServerConnection
-
setAttributetop
public void setAttribute(ObjectName name, Attribute attribute) throws InstanceNotFoundException, AttributeNotFoundException, InvalidAttributeValueException, MBeanException, ReflectionExceptionSets the value of a specific attribute of a named MBean. The MBean is identified by its object name.- Specified by:
- setAttribute from MBeanServerConnection
-
setAttributestop
public AttributeList setAttributes(ObjectName name, AttributeList attributes) throws InstanceNotFoundException, ReflectionExceptionSets the values of several attributes of a named MBean. The MBean is identified by its object name.- Specified by:
- setAttributes from MBeanServerConnection
-
unregisterMBeantop
public void unregisterMBean(ObjectName name) throws InstanceNotFoundException, MBeanRegistrationExceptionUnregisters an MBean from the MBean server. The MBean is identified by its object name. Once the method has been invoked, the MBean may no longer be accessed by its object name.- Specified by:
- unregisterMBean from MBeanServerConnection
