IBM has now certified their Java 1.3.1 SDK's and JRE's for Red Hat for zSeries: http://www-106.ibm.com/developerworks/java/jdk/linux/tested.html
Clicking on that check mark takes you to the detailed requirements: http://www-106.ibm.com/developerworks/java/jdk/linux/zLinuxRHReadMeFirst.html We are now completing our certification testing for Weblogic 7.0 with Service Pack 1 on Red Hat for zSeries, and the download page should be updated with appropriate information soon. If you want an early start, try the existing SuSE download. BEA WebLogic Products for S/390 and zSeries Downloads: http://commerce.bea.com/downloads/weblogic_mainframe.jsp Regards, Jim Rich