Sun Java Enterprise System Glossary



(n.) A place where messages are stored and viewed. See also folder.

mail client

(n.) The programs that help users send and receive email. The mail client is the part of the various networks and mail programs with which users have the most contact. Mail clients create and submit messages for delivery, check for new incoming mail, and accept and organize incoming mail.

mail exchange record

See MX record.

mailing list

See mail list.

mailing list owner

See mail list owner.

mail list

(n.) A list of email addresses to which a message can be sent by way of a mail list address. Sometimes called a group.

mail list owner

(n.) A user who has administrative privileges to add members to and delete members from the mail list.

mail relay

(n.) A mail server that accepts mail from a user account or an MTA and relays it to the mail recipient’s message store or another router.

mail router

See mail relay.

managed bean creation facility

(n.) A mechanism for defining the characteristics of a JavaBeans component used in a JavaServer Faces technology application.

managed object

(n.) An SNMP data element that forms part of an MIB. In Directory Server, the managed objects are held in cn=monitor, and the SNMP agent provides the objects to the network management station. As with LDAP attributes, each managed object has a name and object identifier expressed in dot notation.

managed role

(n.) Allows you to create an explicit enumerated list of members.

management information base

See MTA.

management rule

(n.) Associates a custom self-tuning, self-configuring, or self-healing action with a triggering event in the Application Server. See also event.


(1) (n.) The ability to tie an object-oriented model to a relational model of data, usually the schema of a relational database. The process of converting a schema to a different structure.

(2) (n.) The mapping use users to security roles.

mapping tree

(n.) A data structure that associates the names of suffixes (subtrees) with databases.

master agent

See SNMP master agent.

master channel program

(n.) A channel program that typically initiates a transfer to a remote system. See also slave channel program.

master directory server

(n.) A read-write directory server that contains the data that will be replicated.

matching category

(n.) A category that matches a search query which is returned as a result of a search submission.

matching document

(n.) A document that matches a search query, which is returned as the result of a search submission.

matching rule

(n.) A guideline for how the server compares strings during a search operation. In an international search, the matching rule tells the server what collation order and operator to use.


(n.) A message digest algorithm by RSA Data Security. MD5 can be used to produce a short digest of data that is unique with high probability.

MD5 signature

(n.) A message digest produced by the MD5 algorithm.


(message-driven bean) (n.) An enterprise bean that is an asynchronous message consumer. A message-driven bean has no state for a specific client, but its instance variables might contain state across the handling of client messages, including an open database connection and an object reference to an object based on the EJBTM architecture. A client accesses a message-driven bean by sending messages to the destination for which the message-driven bean is a message listener.


(n.) A user or group who receives a copy of an email addressed to a mail list. See also mail list, expansion, moderator.


(1) (n.) The fundamental unit of email that consists of a header and a body and is often contained in an envelope while it is in transit from the sender to the recipient.

(2) (n.) In the Java Message Service, an asynchronous request, report, or event consumed by a JMS client. A message has a header (to which additional fields can be added) and a body. The message header specifies standard fields and optional properties. The message body contains the data that is being transmitted. A message contains vital information needed to coordinate enterprise applications, in the form of precisely formatted data that describes specific business actions.

message access services

(n.) The protocol servers, software drivers, and libraries that support client access to the Messaging Server message store.

message consumer

(n.) An object created by a JMS session that is used for receiving messages sent to a destination.

message delivery

(n.) The act that occurs when an MTA delivers a message to a local recipient (a mail folder or a program).

message-driven bean

See MDB.

message forwarding

(n.) The act that occurs when an MTA sends a message delivered to a particular account to one or more new destinations as specified by the account’s attributes. Forwarding might be configurable by the user. See also message delivery, message routing.

message handling system

See MHS.

message producer

(n.) An object created by a JMS session that is used for sending messages to a destination.

Message Queue

(n.) The messaging system that implements the JavaTM Message Service (JMS) open standard. Sun Java System Message Queue is a JMS provider.

message queue

(n.) The directory where messages accepted from clients and other mail servers are queued for immediate or deferred delivery.

Message Queue client runtime

(n.) Software that provides JMS clients with an interface to the Java Enterprise System message server. The client runtime supports all operations needed for clients to send messages to destinations and to receive messages from such destinations.

Message Queue message server

(n.) Software that provides delivery services for a Message Queue messaging system, including connections to JMS clients, message routing and delivery, persistence, security, and logging. The message server maintains physical destinations to which JMS clients send messages, and from which the messages are delivered to consuming clients.

message quota

(n.) A limit defining how much disk space a particular folder can consume.

message routing

(n.) The act of transferring a message from one MTA to another when the first MTA determines that the recipient is not a local account, but might exist elsewhere. Routing is normally configurable only by a network administrator. See also message forwarding.

message selector

(n.) A way for a consumer to select messages based on property values (selectors) in JMS message headers. A message service performs message filtering and routing based on criteria placed in message selectors.

message service

See Message Queue message server.

message store

(n.) The database of all locally delivered messages for a Messaging Server instance. Messages can be stored on a single physical disk or stored across multiple physical disks.

message store administrator

(n.) A user who has administrative privileges to manage the message store for a Messaging Server installation. This user can view and monitor mailboxes and specify access control to the store. Using proxy authorization rights, this user can run certain utilities for managing the store.

message store partition

(n.) A message store or subset of a message store residing on a single physical file system partition.

message submission

(n.) The client userAgent transfers a message to the mail server and requests delivery.

message transfer agent

See MTA.


(n.) A system of asynchronous requests, reports, or events used by enterprise applications that allows loosely coupled applications to transfer information reliably and securely.

Messaging Multiplexor

See MMP.

Messaging Server administrator

(n.) The administrator whose privileges include installation and administration of a Messaging Server instance.

messaging server base directory

(n.) The directory into which all servers associated with a given Administration Server on a given host are installed. Typically designated msg_svr_base. See also installation directory.

Messenger Express

(n.) A mail client that enables users to access their mailboxes through a browser-based (HTTP) interface. Messages, folders, and other mailbox information are displayed in HTML in a browser window. See also webmail.

Messenger Express Multiplexor

(n.) A proxy messaging server that acts as a Multiplexor. The server allows you to connect to the HTTP service of Messaging Server (Messenger Express). The Messenger Express Multiplexor facilitates distributing mail users across multiple server machines.


(n.) Information about a component, such as the component’s name and specifications for component behavior. See also deployment descriptor.

metadevice state database replica

(n.) A database, stored on disk, that records configuration and the state of all metadevices and error conditions. This information is important to the correct operation of Solstice DiskSuiteTM software disksets.


(n.) Information about a resource, such as the name of the author, the title of a document, the date of creation, and so on. The Search Engine robot uses metainformation as well as document contents when creating resource descriptions.

method-binding expression

(n.) An expression in the JavaServer Faces expression language that refers to a method of a backing bean. This method performs either event handling, validation, or navigation processing for the UI component whose tag uses the method-binding expression.

method permission

(n.) An authorization rule that determines who is permitted to execute one or more enterprise bean methods.


(message handling system) (n.) A group of connected URL mappings, their user agents, and message stores.


(management information base) (n.) A tree-like structure that defines the variables that the SNMP master agent can access. The MIB provides access to the HTTP server’s network configuration, status, and statistics. Using SNMP, you can view this information from the NMS. See also AUTH.


(n.) The process of transporting data files, such as data configuration or customization, from one version of a product to another.


(multipurpose internet mail extensions) (n.) An emerging standard for multimedia email and messaging. A protocol you can use to include multimedia in email messages by appending the multimedia file in the message.

MIME data type

(n.) MIME types control what types of multimedia files the system supports.

mime.types file

(n.) The MIME type configuration file. This file maps file extensions to MIME types to enable the server to determine the type of content being requested. For example, requests for resources with .html extensions indicate that the client is requesting an HTML file, while requests for resources with .gif extensions indicate that the client is requesting an image file in GIF format.

mirror node

(n.) An active HADB node that contains the same data as another active node, but resides in the other data redundancy unit. Each active node must have a mirror node; therefore nodes occur in pairs. When a node detects that its mirror node has failed, it takes over the failed node’s role and continues service. See also HADB, active node, spare node, and data redundancy unit (DRU).

mixed-content model

(n.) A DTD specification that defines an element as containing a mixture of text and one more other elements. The specification must start with #PCDATA, followed by diverse elements, and must end with the "zero-or-more" asterisk symbol (*).


(Messaging Multiplexor) (n.) A specialized Messaging Server that acts as a single point of connection to multiple mail servers, facilitating the distribution of a large user base across multiple mailbox hosts.

mobile application configuration

(n.) An Access Manager service that allows the setup of address book, calendar, and mail applications for delivery to a mobile device.

mobile client type

See *client type.

mobile device

(n.) A transportable wireless device such as a mobile phone or a personal digital assistant.

mobile devices link

(n.) A hypertext link appearing on the Portal Desktop.

mobile devices page

(n.) A web page which allows users to manage mobile device options.

Mobile Portal Desktop

(n.) A Portal Desktop displayed on a mobile device.


(n.) A person who first receives all email addressed to a mailing list in order to decide if the message should be forwarded to the mailing list. The moderator can edit the message before forwarding the message to the mailing list. See also mail list, expansion, member.


(1) (n.) See J2EE module.

(2) (n.) A group of Java Enterprise System servers dependent on one another or closely enough related to be deployed as a unit to provide a specific service or set of services. Service modules are multi-server assemblies that have been pretested for use in deployment architectures.


(n.) Software utility required for installing the PKCS#11 module for external encryption or hardware accelerator devices.


(message transfer agent) (n.) A specialized program for routing and delivering messages. MTAs work together to transfer messages and deliver them to the intended recipient. The MTA determines whether a message is delivered to the local message store or routed to another MTA for remote delivery.

MTA configuration file

(n.) The imta.cnf file that contains all channel definitions for the Messaging Server as well as the rewrite rule that determine how addresses are rewritten for routing.

MTA directory cache

(n.) A snapshot of the directory service information about users and groups required by the MTA to process messages. See also directory synchronization

MTA hop

(n.) The act of routing a message from one MTA hop to another.


See user agent.

multihomed host

(n.) A host that is on more than one public network.

multihost disk

(n.) A disk that is physically connected to multiple nodes.

multimaster replication

(n.) A replication model in which entries can be written and updated on any of several master replica copies without requiring communication with other master replicas before the write or update is performed. Each server maintains a change log for the replica. Modifications made on one server are automatically replicated to the other servers. In case of conflict, a time stamp is used to determine which server holds the most recent version.


(n.) The server containing the database link that communicates with the remote server.

multipurpose internet mail extensions


mutual authentication

(n.) An authentication mechanism employed by two parties for the purpose of proving each other's identity to one another.

MX record

(mail exchange record) (n.) A type of DNS record that maps one host name to another.