Wicket 1.5.4 - Application crashing on German umlaut characters

[toytown]

Wicket : 1.5.4
Tomcat : 6.0.28 to 6.0.35
JDK - 1.6  
 I have a simple search application where I could enter search parameters
like city name in a input textbox component. I am using displaying the
results in a separate page by passing search criteria  as pageparameters. 

        searchForm.add(new Button("submitSearch") {

            @Override
            public void onSubmit() {
                PageParameters params =  new PageParameters();
                params.set("city", req.getCity());
                setResponsePage(SearchResultPage.class, params);
            }

        });

If a pass normal String like 'Munich' without umlauts everything works ok
  The url is like http://localhost:8080/ecom/home/results?city=Munich  which
is ok and working fine

If I pass the city name with umlaut like 'München' then, I get url like 
http://localhost:8080/ecom/home/results?city=München&city=München&city=München&city=München&city=München&city=München&city=MÃÃ

and EXCEPTION  trace in my log file looks like

05:18:28,092 DEBUG pache.wicket.page.PageAccessSynchronizer: 219 -
'http-8080-1' notifying blocked threads
23.02.2012 05:18:28 org.apache.coyote.http11.Http11Processor process
SCHWERWIEGEND: Error processing request
java.lang.ArrayIndexOutOfBoundsException: 8192
        at
org.apache.coyote.http11.InternalOutputBuffer.write(InternalOutputBuffer.java:730)
        at
org.apache.coyote.http11.InternalOutputBuffer.write(InternalOutputBuffer.java:641)
        at
org.apache.coyote.http11.InternalOutputBuffer.sendHeader(InternalOutputBuffer.java:514)
        at
org.apache.coyote.http11.Http11Processor.prepareResponse(Http11Processor.java:1637)
        at
org.apache.coyote.http11.Http11Processor.action(Http11Processor.java:956)
        at org.apache.coyote.Response.action(Response.java:183)
        at org.apache.coyote.Response.sendHeaders(Response.java:379)
        at
org.apache.catalina.connector.OutputBuffer.doFlush(OutputBuffer.java:314)
        at 
org.apache.catalina.connector.OutputBuffer.close(OutputBuffer.java:274)
        at 
org.apache.catalina.connector.Response.finishResponse(Response.java:493)
        at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:317)
        at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
        at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:602)
        at 
org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
        at java.lang.Thread.run(Thread.java:662)
23.02.2012 05:18:28 org.apache.coyote.http11.Http11Processor process


   There itself is no RuntimeException thrown from wicket but somehow it
generates some strange url which causes ArrayIndexOutofBoundException.

Is this a bug in Wicket or that my preassumption was wrong that
pageparameters should be encoded by Wicket when displayed in the url ? What
is the wa to get around this problem ?

Thanks in advance.


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