Ubuntu 9.04's Java certified compatible
Ubuntu's Java developers have announced that the OpenJDK 6 implementation in Ubuntu 9.04 has now passed compatibility testing and is officially compatible with Java SE 6.
The process of gaining certification started earlier this year and in late May, the developers were informed that OpenJDK 6 had passed. Compatibility testing is performed using the Java SE Test Compatibility Kit (TCK). Passing the TCK means that an implementation of Java can be regarded as an alternative to Sun's own Java releases.
The Java SE TCK is a useful tool, but due to issues over the contract that must to be signed to gain access to the tool, specifically because of "field of use" terms which restrict it to particular kinds of hardware, it has become a bone of contention for the Apache Software Foundation and others.