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JSR 270 is an “Umbrella” JSR, so it doesn’t define specific features itself—instead it lists features defined in other JSRs, or in the concurrent maintenance review of the Java SE platform specification. As an improvement over past umbrella specifications, this time around we’ve augmented each feature description with non-normative links to the relevant draft Mustang javadoc as well as any associated JSRs or other material.

When reviewing this draft please keep in mind that the Umbrella JSR only covers the component JSRs and other big-ticket or highly-visible items in Mustang. Most smaller enhancements aren’t listed in the Umbrella JSR, though of course they will be covered in the maintenance review of the platform specification that’ll start around the time that the beta release of the reference implementation ships.

Mustang is still under development. The JSR 270 Expert Group has approved all of the features listed in the draft, and we expect to see all those features in the final release. It’s still possible, however, for a feature to be dropped if, for example, it turns out to be too difficult to implement. It’s also possible for new features to be added, given sufficient justification, though at this stage big changes to the overall shape of the release are pretty unlikely.

Comments on this draft are most welcome! The formal EDR period ends in sixty days, but you can send feedback to the e-mail address listed in the draft at any time.

Sneak Preview

Here’s a summary of the approved feature list sorted by area, component, and feature name. For more details please see the EDR specification.

client	2d	GIF image writer
	awt	Access to desktop helper applications
		Fast splash screens
		Improved modal dialogs
		System-tray support
	i18n	Pluggable locale data
		Resource-bundle enhancements
		Unicode string normalization
	swing	Baseline/gap APIs
		Improve Swing drag-&-drop
		JTabbedPane: Tabs as components
		JTable sorting, filtering, and highlighting
		SwingWorker
		Text-component printing
core	–	JSR 223: Scripting for the Java Platform
	debug	Access to heap contents
		Attach-on-demand
		Multiple simultaneous agents
	libs	Array reallocation
		Collections: Deques
		Collections: Sorted sets and maps with bidirectional navigation
		Critical file-I/O enhancements
		Floating point: Add core IEEE 754 recommended functions
		java.util.concurrent updates
		JSR 202: Java Class-File Specification Update
		Password prompting
		Reflective access to parameter names
		Service-provider lookup
	m&m	Generalized lock monitoring
		Generalized MBean descriptors
		Generic annotations for MBean descriptor contents
		MXBeans
	net	Internationalized domain names
		Internationalized resource identifiers
		Programmatic access to network parameters
		Simple HTTP cookie manager
	sec	JSR 105: XML Digital-Signature APIs
	tools	JSR 199: Java Compiler API
		JSR 269: Pluggable Annotation-Processing API
ee	–	JSR 250: Common Annotations
	jdbc	JSR 221: JDBC 4.0
	xml	JavaBeans Activation Framework (JAF) 1.1
		JSR 173: Streaming API for XML (StAX)
		JSR 181: Web-Services Metadata
		JSR 222: Java Architecture for XML Binding (JAXB) 2.0
		JSR 224: Java API for XML Web Services (JAX-WS) 2.0

You can check out the initial implementations of many—though not all—of these new features in the weekly snapshot builds of the reference implementation.

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