This article describes the known issues with Mac OS Runtime for Java 2.1.

Secure Sockets : MRJ 2.1 does not support the Secure Sockets Layer interface (SSL), which allows applets to access Web pages via "https."

Appearance Manager 1.0 : If your system is using Appearance Manager 1.0 (which comes with Mac OS 8), you may see dialog boxes without borders or other visual inconsistencies. You should upgrade to Mac OS 8.1 or later. A free upgrade from 8.0 to 8.1 is available at Apple's Web site: http://www.apple.com/swupdates .

Games and modifier keys : Some game applets use the Shift, Alt, and Control keys as game controllers. In some cases, these controls will not work as expected.

Apple Studio Display : If you have an Apple Studio Display (flat-panel monitor) and Mac OS 8.1 or earlier installed, you may see cosmetic inconsistencies in the Monitors & Sound control panel. You should update your Apple Displays software as soon as an update becomes available. To check on its availability, go to http://www.apple.com/swupdates .

Yahoo games : Multi-user Yahoo games do not work correctly using Internet Explorer and MRJ 2.1. Apple, Microsoft, and Yahoo are working together to resolve this problem.

Low memory : When Java applications are running out of memory, MRJ may put up a blank window with no information in it and appear to crash. If this occurs, you can sometimes quit by selecting "Quit" from the Apple Menu (there is no Edit menu since Java did not start up properly). If several applications are running at the same time, quit unused applications to free up memory, or increase the amount of virtual memory in the Memory Control panel, and then try the application again. If this problem persists, you may need to add additional physical RAM.

Printing : If you use your browser's Print command to print a Web page that contains an applet, the page will contain a blank area where the applet should be. If available, use the applet's Print menu to print the page.