See attached screen shot the options available as completions of

this.s

are

static
String
switch (
synchronized 
System.err.println("");
System.out.println("");
stateChanged()

only the last one is a usable completion of "this.s" - everything else will be uncompilable.  There is  
enough information to detect this situation and avoid template completions - either check for the . as 
the previous token, or get the text back to the nearest preceding whitespace character, and only 
include templates that are exact matches.

This does deserve to be P2 - it removes most of the value of code completion if you have to hit the 
down arrow 6 times to skip invalid completions.