Apple released an update for Java on Mac OS X Leopard and Leopard:
Java for Mac OS X 10.5 Update 4 delivers improved reliability, security, and compatibility for Java SE 6, J2SE 5.0 and J2SE 1.4.2 on Mac OS X 10.5.7 and later.
When performing the update, think of closing all web browser applications. For additional information, simply click on the link corresponding to your OS.
