Apple has shipped a Java security update

Apple Java Patch Kills 27 Bugs, Some Critical

"Alongside the release of iOS 4.3, which injected some Nitro into Safari's JavaScript engine, Apple has shipped a Java security update for both Mac OS X Leopard and Snow Leopard, Security Watch reports. The update patches no fewer than 27 vulnerabilities, including an exploit through which hackers could hijack your Mac by running an attack code."