When running the following applets one after the other on Solaris in Mozilla with 1.5.0-b42, NullPointerException may be thrown occasionally in Java Plug-in:

http://sqeweb/deployment3/regression/tiger/JPI/4999282/clock.html
http://sqeweb/deployment1/mantis_ws_plugin/tests/optpkgs/pluginhtml-default/Test_Pure.html
http://java.sun.com/docs/books/tutorial/java/concepts/ClickMeApplets.html
/usr/demo/J2SE/demo/jfc/SwingSet2/SwingSet2.html

The problem could be reproduced only on some Solaris machines, but not all of them. The problem is not reproducible on Linux, and it is reproducible on Windows only if multiple applets are on the same page with very quick page refresh.
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