Server-Class Machine Detection
Improved Support for Environment Variables
JavaBeans Component Architecture
Java API for XML Processing (JAXP)
Remote Method Invocation (RMI)
Java Database Connectivity (JDBC)
Java Naming and Directory Interface (JNDI)
Java Virtual Machine Tool Interface (JVMTI)
Java Platform Debugger Architecture (JPDA)
Annotation Processing Tool (apt)
Pack200, a new hyper-compression format for JAR files defined by JSR 200, can siginificantly reduce the download size of JAR files used in Java Webstart applications and Java Plug-in applets.
For a synopsis of general deployment features and enhancements, refer to http://java.sun.com/j2se/1.5.0/docs/guide/deployment/enhancements-1.5.0.html.
For a synopsis of Java Web Start deployment features and enhancements, refer to http://java.sun.com/j2se/1.5.0/docs/guide/javaws/enhancements-1.5.0.html