Bean Validation – JSR 303 | Download spec
This JSR defines a meta-data model and API for JavaBean validation based on annotations with overrides and extended meta-data through the use of XML validation descriptors.
Enterprise JavaBeans (EJB) technology is the server-side component architecture for the Java Platform, Enterprise Edition (Java EE). EJB technology enables rapid and simplified development of distributed, transactional, secure and portable applications based on Java technology. The Java Persistence API, which provides a POJO persistence model for object-relational mapping, is also part of JSR 220, although its use is not limited to EJB software components.
The Java Persistence API provides a POJO persistence model for object-relational mapping. The Java Persistence API was developed by the EJB 3.0 software expert group as part of JSR 220, but its use is not limited to EJB software components. It can also be used directly by web applications and application clients, and even outside the Java EE platform, for example, in Java SE applications. The Java Data Objects (JDO) API is another standard for Java persistence, developed under the Java Community Process. See JSR 243.
Java Message Service API – JSR 914 | Download spec
The Java Message Service (JMS) API is a messaging standard that allows application components based on the Java 2 Platform, Enterprise Edition (J2EE) to create, send, receive, and read messages. It enables distributed communication that is loosely coupled, reliable, and asynchronous.
JTA specifies standard Java interfaces between a transaction manager and the parties involved in a distributed transaction system: the resource manager, the application server, and the transactional applications. The JTA specification was developed by Sun Microsystems in cooperation with leading industry partners in the transaction processing and database system arena.
JavaBeans Activation Framework (JAF) 1.1 (in Java SE) – JSR 925 | Download spec
With the JavaBeans Activation Framework standard extension, developers who use Java technology can take advantage of standard services to determine the type of an arbitrary piece of data, encapsulate access to it, discover the operations available on it, and to instantiate the appropriate bean to perform said operation(s).
JavaMail 1.4 – JSR 919 | Download spec
The JavaMail API provides a platform-independent and protocol-independent framework to build mail and messaging applications. The JavaMail API is implemented as a Java platform optional package and is also available as part of the Java platform, Enterprise Edition.