Good news I found a way to get the content Assist working with flash bluider 4.7, you need only to ignore svn folders and files in the project properties
check the following options :
All childrens (recursive)
and then choose name *.svn*
validate and close windows try a cmd+space or ctrl+space I have no more java.lang.nullpointerexception !!
if you don't have any svn files in your project maybe your problem comes from some other source
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