JDK and JBoss ... 32-bit or 64-bit ?

Hi ! I wanted to know what flavour of JDK/JRE comes with 'SUSE LINUX Enterprise Server 9'. i.e. - 32-bit or 64-bit ? If 64-bit JDK/JRE, then, is JBoss compiled in the 64-bit environment ? How much memory can the JDK/JRE address ? Note: All quetions are pertaining to installing Suse on Sun Opteron (V20Z) servers. TIA, Kunal