NPE in HttpHeaderHelper.mapCharset

ConcurrentHashMap doesn't allow null values:

public V put(K key, V value) {
if (value == null)
throw new NullPointerException();

So this part of HttpHeaderHelper.mapCharset doesn't make much sense to me:

if (newenc == null) {
try

{ newenc = Charset.forName(enc).name(); }

catch (Exception ex)

{ //ignore }

encodings.put(enc, newenc);
}

I don't use Netbeans very much, but when I hover over the enc variable, it appears that utf-8 might have been passed in with some quotes, not sure.

Nov 21, 2007 2:05:17 PM org.apache.cxf.service.factory.ReflectionServiceFactoryBean buildServiceFromWSDL
INFO: Creating Service

{http://soap.metbase.fluke.com/}

EventSoapService from WSDL: http://localhost:8080/EventSoapService/EventSoapImpl?wsdl
Nov 21, 2007 2:09:37 PM org.apache.cxf.phase.PhaseInterceptorChain doIntercept
INFO: Interceptor has thrown exception, unwinding now
java.lang.NullPointerException
at java.util.concurrent.ConcurrentHashMap.put(ConcurrentHashMap.java:878)
at org.apache.cxf.helpers.HttpHeaderHelper.mapCharset(HttpHeaderHelper.java:82)
at org.apache.cxf.transport.http.HTTPConduit$WrappedOutputStream.handleResponse(HTTPConduit.java:1930)
at org.apache.cxf.transport.http.HTTPConduit$WrappedOutputStream.close(HTTPConduit.java:1791)
at org.apache.cxf.transport.AbstractConduit.close(AbstractConduit.java:66)
at org.apache.cxf.transport.http.HTTPConduit.close(HTTPConduit.java:575)
at org.apache.cxf.interceptor.MessageSenderInterceptor$MessageSenderEndingInterceptor.handleMessage(MessageSenderInterceptor.java:62)
at org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:207)
at org.apache.cxf.endpoint.ClientImpl.invoke(ClientImpl.java:254)
at org.apache.cxf.endpoint.ClientImpl.invoke(ClientImpl.java:205)
at org.apache.cxf.frontend.ClientProxy.invokeSync(ClientProxy.java:73)
at org.apache.cxf.jaxws.JaxWsClientProxy.invoke(JaxWsClientProxy.java:135)
at $Proxy21.getUncertaintyDataParameter(Unknown Source)
at com.fluke.metbase.soap.client.TryEventService.main(TryEventService.java:30)