Hi,
I'm trying to make a call from a desktop client to a webservice method running on JBoss 5.1.0. It connects to the webservice, but when calling the webmethod I got the following error:

On the client side:
javax.xml.ws.WebServiceException: java.lang.NullPointerException
at com.sun.xml.ws.transport.http.client.HttpTransportPipe.process(HttpTransportPipe.java:176)
at com.sun.xml.ws.transport.http.client.HttpTransportPipe.processRequest(HttpTransportPipe.java:86)
at com.sun.xml.ws.api.pipe.Fiber.__doRun(Fiber.java:595)
at com.sun.xml.ws.api.pipe.Fiber._doRun(Fiber.java:554)
at com.sun.xml.ws.api.pipe.Fiber.doRun(Fiber.java:539)
at com.sun.xml.ws.api.pipe.Fiber.runSync(Fiber.java:436)
at com.sun.xml.ws.client.Stub.process(Stub.java:248)
at com.sun.xml.ws.client.sei.SEIStub.doProcess(SEIStub.java:135)
at com.sun.xml.ws.client.sei.SyncMethodHandler.invoke(SyncMethodHandler.java:109)
at com.sun.xml.ws.client.sei.SyncMethodHandler.invoke(SyncMethodHandler.java:89)
at com.sun.xml.ws.client.sei.SEIStub.invoke(SEIStub.java:118)
at $Proxy22.fileUp(Unknown Source)
at ro.datagroup.verlinkung.upload.webservice.TestProcess.testEJBWebService(TestProcess.java:75)
at ro.datagroup.verlinkung.upload.webservice.TestProcess.main(TestProcess.java:82)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:90)
Caused by: java.lang.NullPointerException
at com.sun.xml.internal.stream.writers.XMLStreamWriterImpl.getProperty(XMLStreamWriterImpl.java:426)
at com.sun.xml.ws.util.xml.XMLStreamWriterFilter.getProperty(XMLStreamWriterFilter.java:139)
at com.sun.xml.ws.streaming.XMLStreamWriterUtil.getOutputStream(XMLStreamWriterUtil.java:77)
at com.sun.xml.ws.message.jaxb.JAXBMessage.writePayloadTo(JAXBMessage.java:313)
at com.sun.xml.ws.message.AbstractMessageImpl.writeTo(AbstractMessageImpl.java:142)
at com.sun.xml.ws.encoding.MtomCodec.encode(MtomCodec.java:158)
at com.sun.xml.ws.encoding.SOAPBindingCodec.encode(SOAPBindingCodec.java:258)
at com.sun.xml.ws.transport.http.client.HttpTransportPipe.process(HttpTransportPipe.java:142)
... 18 more

On server side:
ERROR [org.jboss.ws.core.jaxws.SOAPFaultHelperJAXWS] (http-0.0.0.0-8080-1) SOAP request exception
ClientAbortException: java.net.SocketException: Connection reset
at org.apache.catalina.connector.InputBuffer.realReadBytes(InputBuffer.java:342)
at org.apache.tomcat.util.buf.ByteChunk.substract(ByteChunk.java:420)
at org.apache.catalina.connector.InputBuffer.read(InputBuffer.java:364)
at org.apache.catalina.connector.CoyoteInputStream.read(CoyoteInputStream.java:193)
at java.io.FilterInputStream.read(FilterInputStream.java:116)
at java.io.PushbackInputStream.read(PushbackInputStream.java:169)
at org.jboss.ws.core.soap.attachment.BoundaryDelimitedInputStream.fullRead(BoundaryDelimitedInputStream.java:144)
at org.jboss.ws.core.soap.attachment.BoundaryDelimitedInputStream.read(BoundaryDelimitedInputStream.java:191)
at org.jboss.ws.core.soap.attachment.BoundaryDelimitedInputStream.read(BoundaryDelimitedInputStream.java:312)
at org.jboss.ws.core.soap.attachment.BoundaryDelimitedInputStream.read(BoundaryDelimitedInputStream.java:286)
at org.jboss.ws.core.soap.attachment.MultipartRelatedDecoder.decodeMultipartRelatedMessage(MultipartRelatedDecoder.java:119)
at org.jboss.ws.core.soap.MessageFactoryImpl.createMessage(MessageFactoryImpl.java:241)
at org.jboss.ws.core.soap.MessageFactoryImpl.createMessage(MessageFactoryImpl.java:193)
at org.jboss.wsf.stack.jbws.RequestHandlerImpl.processRequest(RequestHandlerImpl.java:455)
at org.jboss.wsf.stack.jbws.RequestHandlerImpl.handleRequest(RequestHandlerImpl.java:295)
at org.jboss.wsf.stack.jbws.RequestHandlerImpl.doPost(RequestHandlerImpl.java:205)
at org.jboss.wsf.stack.jbws.RequestHandlerImpl.handleHttpRequest(RequestHandlerImpl.java:131)
at org.jboss.wsf.common.servlet.AbstractEndpointServlet.service(AbstractEndpointServlet.java:85)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:235)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:190)
at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:92)
at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.process(SecurityContextEstablishmentValve.java:126)
at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:70)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:158)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:330)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:829)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:598)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.net.SocketException: Connection reset
at java.net.SocketInputStream.read(SocketInputStream.java:168)
at org.apache.coyote.http11.InternalInputBuffer.fill(InternalInputBuffer.java:745)
at org.apache.coyote.http11.InternalInputBuffer$InputStreamInputBuffer.doRead(InternalInputBuffer.java:775)
at org.apache.coyote.http11.filters.ChunkedInputFilter.readBytes(ChunkedInputFilter.java:245)
at org.apache.coyote.http11.filters.ChunkedInputFilter.parseChunkHeader(ChunkedInputFilter.java:276)
at org.apache.coyote.http11.filters.ChunkedInputFilter.doRead(ChunkedInputFilter.java:132)
at org.apache.coyote.http11.InternalInputBuffer.doRead(InternalInputBuffer.java:704)
at org.apache.coyote.Request.doRead(Request.java:428)
at org.apache.catalina.connector.InputBuffer.realReadBytes(InputBuffer.java:332)
... 38 more

I get the same problem regardless the webmethod signature or content.
The weird thing is that the same client & ws code actually works on an older application.
Can anybody give me a hint about what is or might be the problem?!?

Thanks,
Paul.