| Acronym | Definition | External Links | |
| J2EE |
Java 2 platform, Enterprise Edition |
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| J2ME |
Java 2 platform, Micro Edition |
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| J2SE |
Java 2 platform, Standard Edition |
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| JAAS |
Java Authentication and Authorization Service |
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| JAD |
Joint Application Development |
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| JAF |
JavaBeans Activation Framework (technology) |
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| JAM |
Just A Minute |
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| JANET |
Joint Academic Network |
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| JAPE |
Just Another Proof Editor |
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| JASE |
Just Another System Error |
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| JAT |
Just A Thought |
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| JAUC |
Journal of American Underground Computing |
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| JAVA |
Just Another Vague Acronym |
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| JAX |
Java API for XML |
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| JAXR |
Java API for XML Registry |
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| JAXRPC |
Java API for XML-based Remote Procedure Call (usually as JAX-RPC) |
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| JAX-RPC |
Java API for XML-based Remote Procedure Call |
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| JBIG |
Joint Bi-level Imaging Group |
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| JBOD |
Just a Bunch Of Disks |
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| JCA |
Java Cryptography Architecture |
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| JCE |
Java Cryptography Extension (API) |
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| JCIA |
Japan Camera Industry Association (now known as Camera & Imaging Products Association) |
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| JCK |
Java (platform) Compatibility Kit |
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| JCL |
Job Control Language |
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| JCP |
Java Community Process (program) |
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| JCT |
[CICS] Journal Control Table |
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| JCW |
Job Control Word |
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| JDA |
Joint Development Agreement |
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| JDBC |
Java DataBase Connection / Java DataBase Connectivity |
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| JDF |
Job Definition Format |
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| JDK |
Java Development Kit |
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| JEC |
Job Evaluation Classification |
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| JEDI |
Joint Electronic Data Interchange |
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| JEE |
Job-Employee-Employer (model) |
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| JEIDA |
Japanese Electronic Industry Development Association |
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| JEITA |
Japan Electronics and Information Technology (Industries) Association |
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| JEMA |
Japanese Electric Machinery Association |
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| JEPI |
Joint Electronic Payment Initiative |
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| JES |
[MVS] Job Entry Subsystem |
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| JES |
Java Embedded Server |
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| JFC |
Java Foundation Classes |
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| JFIF |
JPEG File Interchange Format |
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| JFS |
Journaled File System |
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| JFTR |
Just For The Record |
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| JIDM |
(X/Open) Joint InterDomain Management |
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| JIF |
JPEG Interchange Format |
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| JIM |
Job Information Memorandum |
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| JIPS |
JANET Internet Protocol Service |
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| JIS |
Jurisdictional Interstate Services |
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| JISC |
Japanese Industrial Standards Committee |
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| JIT |
Just In Time |
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| JITEC |
Joint Information Technology Experts Committee |
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| JJ |
Just Joking (sometimes as j/j) |
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| JK |
Just Kidding (sometimes as j/k) |
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| JM |
Joint Menu (message) |
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| JMAIL |
Junk eMail (aka Spam) |
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| J-MAIL |
Junk eMail (aka Spam) |
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| JMAPI |
Java Management Application Programming Interface |
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| JMF |
Java Media Framework (technology) |
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| JMF |
Job Messaging Format |
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| JMHO |
Just My Humble Opinion |
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| JMO |
Just My Opinion |
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| JMS |
Java Message Service (technology) |
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| JMUG |
Japanese MAP/TOP User Group |
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| JMX |
Java Management Extensions |
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| JMX |
Jumbogroup Multiplex |
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| JNDI |
Java Naming and Directory Interface |
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| JNI |
Java Native Interface (technology) |
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| JNT |
Joint Network Team |
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| JOKE |
Just One Kidding Everyone |
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| JOOP |
Journal of Object-Oriented Programming |
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| JORAM |
Java Open Reliable Asynchronous Messaging |
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| JOT |
Just One Thought |
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| JP |
Just Playing (sometimes as j/p) |
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| JPDA |
Java Platform Debugging Architecture |
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| JPEG |
Joint Photographic Experts Group |
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| JRAG |
Joint Registration Advisory Group |
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| JRE |
Java Runtime Environment |
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| JS |
JavaScript (also known as ECMAScript; previously LiveScript) |
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| JSA |
Japan Standards Association |
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| JSDT |
Java Shared Data Toolkit |
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| JSN |
Junction Switch Number |
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| JSON |
JavaScript Object Notation |
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| JSP |
Java Server Pages |
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| JSR |
Java (technology) Specification Request |
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| JSSE |
Java Secure Socket Extension |
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| JSW |
Junctor Switch |
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| JTA |
Java Transaction API |
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| JTAG |
Joint Test Action Group (IEEE Standard 1149.1) |
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| JTAPI |
Java Telephony Application Programming Interface |
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| JTC |
Joint Technical Committee |
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| JTFM |
Just The Facts, Ma'am / Just the Facts, Mister |
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| JTLYK |
Just To Let You Know |
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| JTM |
Job Transfer and Manipulation |
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| JTS |
Java Transaction Service (technology) |
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| JUGHEAD |
Java Management Extensions |
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| JUNET |
Japanese UNIX Network |
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| JVM |
Java Virtual Machine |
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| JVTOS |
Joint Viewing and Tele-Operation Service |
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| JWSDP |
Java WebService Development Pack |
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