Error decoding 4-bit RLE compressed BMP image.

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I don't know if this is related, but I've been having problems
with decoding BMP images using JAI.create("url",...), both
with certain images being decoded into a corrupted form, and
others failing to decode with a 
java.lang.ArrayIndexOutOfBoundsException.

This was *only* happening when running in an applet - and
I've finally managed to trace it to the code in question
attempting to create a file in the temp folder and failing
because of the applets tightened up security policy.

The workaround was to supply a user/system policy file to the 
JRE being used by the plugin to run the applet that specified:
____

grant codeBase "http://yourserver/-" {
  permission java.io.FilePermission "${java.io.tmpdir}${/}
*", "read, write, delete";
};
____

If this the problem, presumably it can be avoided in future
releases by using an in-memory buffer/stream to decode
rather than storing the file in the local tmp directory.

Also, it only happens with certain BMPs - most work fine.