JSTL FMT multiple content-language headers

Question

hello
this is my second post about htis same problem. I am alot smarter now (which isn't saying much). But on ASF bugzilla they claim this is a OC4J issue. I can easily reproduce the problem.
the link is
http://issues.apache.org/bugzilla/show_bug.cgi?id=28248
A brief summary, each time i call fmt:formatNumber it ADDS a content-language header, eventually it overflows the browsers buffers or something similar and causes an error. Is there a work around for this problem?
Please help
thanks
troy

Answer 1

hi troy,
i think, they'll dont fix it (it's too trivial), but i suggest a workaround. establish a simple filter (thanks servlet 2.3), that prevent subsequent setLocale calls to the response object.
Here is my workaround.
[web.xml]
<filter>
<filter-name>oc4jsetlocalefilter</filter-name>
<display-name>SetLocaleFilter</display-name>
<filter-class>workarounds.oc4j.setlocale.SetLocaleFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>oc4jsetlocalefilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
[SetLocaleFilter.java]
package workarounds.oc4j.setlocale;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletResponse;
public class SetLocaleFilter
implements Filter
public SetLocaleFilter()
public void init(FilterConfig p0) throws ServletException
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
throws IOException, ServletException
if (response instanceof HttpServletResponse)
SetLocaleResponseWrapper respWrapper =
new SetLocaleResponseWrapper((HttpServletResponse)response);
chain.doFilter(request,respWrapper);
else {
chain.doFilter(request,response);
public void destroy()
[SetLocaleResponseWrapper.java]
package workarounds.oc4j.setlocale;
import java.util.Locale;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpServletResponseWrapper;
public class SetLocaleResponseWrapper extends HttpServletResponseWrapper
public SetLocaleResponseWrapper(HttpServletResponse response)
super(response);
public void setLocale(Locale locale)
if (containsHeader("Content-Language"))
System.out.println("setLocale skipped by filter. Content-Language already set.");
return;
System.out.println("setLocale called.");
super.setLocale(locale);
Good luck,
Daniel