GWT with appengine - displaying and Storing (to datastore) special characters, how to?

GWT with appengine - displaying and Storing (to datastore) special
characters, how to?

so i am a bit stucked on this and i am also a bit lost. I have a GWT App
and all .java files and everything is encoded in cp1250 (as default, from
container) i tried to change encoding at my .html (because everything was
in UTF-8)
<meta http-equiv="content-type" content="text/html; charset=cp1250">
and also web.xml file,appengine-web.xml file and .gwt.xml file
<?xml version="1.0" encoding="utf-8"?>
to cp1250 but i cant get the encoding right, i need to display and store
characters like áéžèíóš¾å... i also tried to change encoding of some
.java files to ISO--8859-1 as well as in the .html and .xml files but
nothing worked. I dont know EXACTLY what to change, so maybe thats my
problem.
I use RPCs for text(String) transfer so i can get those characters from
input to server side and write them with println() correctly, but i cant
save them to datastore correctly.
So, is there a way to store such characters or show them in Labels etc. ?
If yes, what should i do exactly ? Or storing in datastore and showing
them only in com.google.gwt.user.client.ui.HTML would be sufficient as
well, thanks a lot for your time.