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I had unmounted several local filesystems, and performed a search/replace to change a jsp expression to EL notation, i.e., < % = caller % > to $ { caller }. It made the replacement (I could see the editor pane behind the dialog), but when I clicked Close button, I received the null pointer exception.
Created attachment 19902 [details] IDE Log
Looks like there was something wrong with the JspMultiSyntax so forwarding to web module for evaluation. Not sure whether this is not already fixed (in 4.0) by fixes for issue 37322 and issue 48172.
Reassigning to JSP editor. It is probably already fixed.
This is not reproducible in nb 4.1
I can't reproduce it either in development build #200504072207 of NetBeans 4.1.