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J2EE: See Java™ 2 Platform Enterprise Edition.
J2SE: See Java 2 Platform Standard Edition.
Jamo: Elements of Korean written language. Korean alphabet.
Japanese basic-Kanji character set: A subset of Japanese DBCS, consisting of commonly used Kanji characters. There are 3226 Kanji characters in this set.
Japanese dictionary: See DBCS conversion dictionary.
Japanese double-byte character set: An IBM-defined double-byte character set for Japanese, consisting of the Japanese non-Kanji set, basic Kanji set, extended Kanji set, and up to 4370 user-definable characters.
Japanese extended-Kanji character set: A subset of Japanese DBCS, consisting of less commonly used Kanji characters. There are 3487 characters in this set.
Japanese non-Kanji character set: A subset of Japanese DBCS, consisting of non-Kanji characters like Greek, Russian, Roman numeric, alphanumeric and related symbols, Katakana, Hiragana, and special symbols. There are 550 characters in this set.
JAR: See Java archive.
Java: An object-oriented programming language for portable interpretive code that supports interaction among remote objects. Java was developed and specified by Sun Microsystems, Incorporated.
Java 2 Platform Enterprise Edition (J2EE): An environment for developing and deploying enterprise applications, defined by Sun Microsystems Inc. The J2EE platform consists of a set of services, application programming interfaces (APIs), and protocols that provide the functionality for developing multitiered, Web-based applications. (Sun) See also Java 2 Platform Standard Edition.
Java 2 Platform Standard Edition (J2SE): The core Java technology platform. (Sun) See also Java 2 Platform Enterprise Edition, Java Development Kit.
Java 2 Software Development Kit Standard Edition: A product of Sun Microsystems, Inc. that implements the Java 2 Platform, Standard Edition. It is a software development kit that you can use to build applications for the Java 2 Platform, Standard Edition. It includes both the Java 2 development environment, Standard Edition and Java 2 Runtime Environment, Standard Edition.
Java archive (JAR): A compressed file format for storing all the resources that are required to install and run a Java program in a single file.
JavaBeans™: As defined for Java by Sun Microsystems, a portable, platform-independent, reusable component model. See also bean.
Java Database Connectivity (JDBC): An industry standard for database-independent connectivity between the Java platform and a wide range of databases. The JDBC interface provides a call-level API for SQL-based database access.
Java Developer Connection (JDC): A service that is designed for individual developers. JDC provides online training, product discounts, feature articles, error information, and early access capabilities.
Java Development Kit (JDK): The name of the software development kit that Sun Microsystems provided for the Java platform, up to and including v 1.1.x. In v 1.2, Sun changed their product name to Java 2 SDK. Sometimes (erroneously) used to mean the Java platform or as a generic term for Java developer kit. See also Java 2 Platform Standard Edition.
Java interpreter: A part of the Java virtual machine that interprets Java class files for a particular hardware platform.
Java Native Interface (JNI): A programming interface that allows Java code to interoperate with functions that are written in other programming languages.
Java Runtime Environment (JRE): A subset of the Sun Microsystems Java Development Kit (JDK) that contains the core executable programs and files that constitute the standard Java platform. The JRE includes the Java virtual machine (JVM), core classes, and supporting files.
JavaScript™: A Web scripting language that is used in both browsers and Web servers. (Sun)
Java transformer: Software that converts Java bytecode to 64-bit reduced instruction set computer (RISC) machine instructions.
Java virtual machine (JVM): A software implementation of a central processing unit that runs compiled Java code (applets and applications).
JCT: See journal control table.
JDBC: See Java Database Connectivity.
JDC: See Java Developer Connection.
JDK: See Java Development Kit.
JES: See Job Entry Subsystem.
JID: See journal identifier.
JIT compiler: See Just-In-Time compiler.
jitter: A signal distortion through a network that causes packets to arrive out of order or differently than their original timing reference.
JNI: See Java Native Interface.
job: (1) See application process.; (2) A separately executable unit of work defined by a user, and run by a computer.; (3) In the Integrated Language Environment® (ILE) model, a collection of resources and data that consists of one or more activation groups.
job accounting: A system function that collects information about a job's use of system resources and records that information in a journal.
job action: The network attribute that controls the handling of a job submitted from remote locations through either the SNADS network or RSCS.
job classification: In performance, the process of identifying how jobs that are running on the system are grouped into workloads. Files created during this process can be used again to analyze data from different intervals.
job control authority: A special authority that allows a user to: change, delete, display, hold, and release all files on output queues; hold, release, and clear job queues and output queues; start writers to output queues; hold, release, change, and end other users' jobs; change the class attributes of a job; end subsystems; and start (do an IPL of) the system.
job date: The date associated with a job. The job date usually assumes the system date, but it can be changed by the user.
job description: A system object that defines how a job is to be processed. The system-recognized identifier for the object type is *JOBD.
Job Entry Subsystem (JES): An IBM® licensed program that receives jobs into the system and processes all output data that is produced by jobs.
job log: A record of requests submitted to the system by a job, the messages related to the requests, and the actions performed by the system on the job. The job log is maintained by the system program.
job message queue: A message queue that is created for each job. A job message queue receives requests to be processed (such as commands) and sends messages that result from processing the requests. A job message queue consists of an external message queue and a set of program message queues.
job name: The name of the job as identified to the system. For an interactive job, the job is assigned the name of the work station at which the job was started; for a batch job, the name is specified in the command used to submit the job. See also qualified job name.
job queue: An object that contains a list of batch jobs waiting to be processed by the system. The system-recognized identifier for the object type is *JOBQ.
job schedule: An object that contains entries for jobs to be submitted at a specified time and date. These job schedule entries can also be used to schedule recurring jobs. The system-recognized identifier for the object type is *JOBSCD.
job schedule entry: An entry in the job schedule object that describes the job to be submitted. The user can specify attributes of the job and when the job will be submitted.
job schedule function: A function of the operating system that allows time-dependent scheduling for batch jobs.
job scheduler: The IBM licensed program that is a job scheduling system designed to allow unattended operations, to automate operator functions, and to control report distribution.
join: (1) An operation that combines data from two or more files using specified fields.; (2) An SQL relational operation that allows retrieval of data from two or more tables based on matching column values.; (3) To become a new member of an entity such as a cluster.
join field: A comparison field that identifies records from two files to be combined into one record.
join level specification: For a join logical file, a data description specification coded between the record and field level that defines how to join two physical files.
join logical file: A logical file that combines (in one record format) fields from two or more physical files.
join test: A condition that determines how files and record formats are joined for use in a query.
journal: A system object that identifies the objects being journaled, the current journal receiver, and all the journal receivers on the system for the journal. The system-recognized identifier for the object type is *JRN.
journal code: A one-character code in a journal entry that identifies the category of the journal entry. For example, F identifies an operation on a file; R identifies an operation on a record, and so forth.
journal control: The ability for the CICS® user to write CICS journal records when required by the application for auditing purposes.
journal control table (JCT): A table that contains a description of the CICS user journals along with their access characteristics.
journal entry: A record in a journal receiver that contains information about a journaled change or other activity that is journaled.
journal entry type: A two-character field in a journal entry that identifies the type of operation of a system-generated journal entry or the type of journal entry of a user-generated journal entry; for example, PT is the entry type for a write operation.
journal identifier (JID): A unique identifier that is assigned to a particular object when journaling is started for that object. Journal entries are associated with a particular object by this JID value.
journaling: The process of recording, in a journal, the changes made to objects, such as physical file members or access paths, or the depositing of journal entries by system or user functions.
JRE: See Java Runtime Environment.
Julian date: A date format that contains the year in positions 1 and 2, and the day in positions 3 through 5. The day is represented as 1 through 366, right-adjusted, with zeros in the unused high-order positions. For example, the Julian date for April 6, 1987 is 87096.
jumper: A small piece of plastic-covered metal that is used to connect two contacts and complete a circuit.
justify: To adjust text so that line endings are even.
Just-In-Time compiler (JIT compiler): In Java, a specific compiler that converts Java bytecodes into specific code at run time for better performance.
JVM: See Java virtual machine.