VelocityServlet: Error processing the template

ISO-8869-2
java.io.UnsupportedEncodingException: ISO-8869-2
	at sun.nio.cs.StreamEncoder.forOutputStreamWriter(StreamEncoder.java:42)
	at java.io.OutputStreamWriter.(OutputStreamWriter.java:83)
	at org.mortbay.servlet.GzipFilter$GZIPResponseWrapper.getWriter(GzipFilter.java:317)
	at pl.free4web.webapp.Form2MailServlet.handleRequest(Form2MailServlet.java:104)
	at org.apache.velocity.servlet.VelocityServlet.doRequest(VelocityServlet.java:396)
	at org.apache.velocity.servlet.VelocityServlet.doGet(VelocityServlet.java:355)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
	at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:502)
	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1148)
	at org.mortbay.servlet.UserAgentFilter.doFilter(UserAgentFilter.java:81)
	at org.mortbay.servlet.GzipFilter.doFilter(GzipFilter.java:129)
	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1139)
	at pl.free4web.webapp.P3PFilter.doFilter(P3PFilter.java:76)
	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1139)
	at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:378)
	at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
	at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
	at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
	at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:417)
	at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:199)
	at org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
	at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
	at org.mortbay.jetty.Server.handle(Server.java:324)
	at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:535)
	at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:865)
	at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:539)
	at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)
	at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
	at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
	at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:520)