The project would provide a full-featured version of OpenJDK for the two platforms. OpenJDK serves as the open source implementation of standard Java. The ports of Java to PowerPC already exist but would be rendered for the open source realm. "The purpose of this project is to bundle Oracle's, IBM's, and SAP's development resources to provide a free, 'state-of-the-art' Java reference implementation on Linux and AIX on PowerPC," said Volker Simonis, a Java VM hacker and OpenJDK evangelist at SAP who is spearheading the project.

"This reference implementation can then be used by IBM and SAP to provide their commercially licensed Java offerings in much the same way in which Oracle offers its Oracle JDK product based on OpenJDK," Simonis said. "The big advantage for the open source community is that everybody (i.e. Linux distributors like Debian, Red Hat, or Ubuntu) will be able to build and provide free and state-of-the-art versions of Java based on the new OpenJDK platform ports. And of course they are highly welcome to engage in the project as well."

Currently, Linux/Power distributions either come with no Java at all, or the users have to get a proprietary Java Development Kit (JDK) from IBM, Volker said. Or alternative implementations are used such as Harmony. But these implementations are outdated and/or are orders of magnitude slower than recent commercial JDKs, he said.

In his proposal, which was floated on an online OpenJDK discussion group, Volker said having OpenJDK on PowerPC would add the first weak memory architecture to OpenJDK, leading to fixes. "As we already know from past experience, this will unveil all kinds of intricate memory ordering problems. Moreover, adding AIX as a new Unix flavor to the set of supported operating systems will uncover numerous implicit assumptions and shortcuts inside the code base, which only hold true for Linux and Solaris. We strongly believe that fixing these issues will considerably increase the robustness and further portability of the OpenJDK."