Java Update isn't working

I just updated the Java on my iMac running Leopard to 1.5.0_28
However, now whenever I try to run a java based application, i recieve the following error message.
[SEVERE] Unexpected exception
java.lang.NullPointerException
at java.util.TimeZone.parseCustomTimeZone(TimeZone.java:780)
at java.util.TimeZone.getTimeZone(TimeZone.java:484)
at java.util.TimeZone.setDefaultZone(TimeZone.java:587)
at java.util.TimeZone.getDefaultRef(TimeZone.java:544)
at java.util.TimeZone.getDefault(TimeZone.java:531)
at java.text.SimpleDateFormat.initialize(SimpleDateFormat.java:521)
at java.text.SimpleDateFormat.<init>(SimpleDateFormat.java:464)
at java.text.SimpleDateFormat.<init>(SimpleDateFormat.java:445)
at mu.<init>(SourceFile:12)
at ef.a(SourceFile:11)
at net.minecraft.server.MinecraftServer.d(SourceFile:90)
at net.minecraft.server.MinecraftServer.run(SourceFile:246)
at bg.run(SourceFile:375)
How can I fix this, it's very important that I can do so as soon as possible.
Thanks,

up!
Same problem here with Java 1.5 and 1.6.0_24!
Thanks in advance!

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