Sun Java Platform, Standard Edition 1.5.0_12
The Sun Java Platform, Standard Edition (JSE) Development Kit (JDK) contains the essential compiler, tools, runtime libraries, and APIs for developers writing, deploying, and running applets and applications in the Java programming language. The JSE Runtime Environment (JRE) contains the runtime libraries and tools for running applets and applications.
Olson time zone data was updated to version 2007e. Solaris-specific I/O interruption in response to thread interruption can now be switched off. Many bugs were fixed.
URL: Java SE - Overview - at a Glance