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This version is a major bugfix for the C/C++, Ruby on Rails, PHP, Python, and LAMP distributions. The 1.2.1 release introduced two bugs in the built-in Java runtime that those distributions require. Many people reported issues when using non-English languages and non-western European character sets. Linux users may also have experienced weird crashes and other unexplained problems.
This release offers specialized distributions for Java (mobile, desktop, server/J2EE, and plugins), PHP, Ruby, Python, and LAMP, and many plugins, all packaged with an easy installer.