我正在使用jboss EAP 6.3来部署使用@WebService注释的Web服务以及打开并发线程以从该Web服务请求相同方法的客户端，并且每个线程都拥有它自己的webservice实例，但有时服务器使用以下消息产生异常：
JBWEB001018: An exception or error occurred in the container during the request processing: java.lang.NullPointerException at
org.apache.tomcat.util.http.MimeHeaders.setValue(MimeHeaders.java:381) [jbossweb-7.4.8.Final-redhat-4.jar:7.4.8.Final-redhat-4]
at org.apache.coyote.http11.Http11Processor.prepareResponse(Http11Processor.java:1558) [jbossweb-7.4.8.Final-redhat-4.jar:7.4.8.Final-redhat-4]
at org.apache.coyote.http11.Http11Processor.action(Http11Processor.java:977) [jbossweb-7.4.8.Final-redhat-4.jar:7.4.8.Final-redhat-4]
at org.apache.coyote.Response.action(Response.java:190) [jbossweb-7.4.8.Final-redhat-4.jar:7.4.8.Final-redhat-4]
at org.apache.coyote.Response.sendHeaders(Response.java:390) [jbossweb-7.4.8.Final-redhat-4.jar:7.4.8.Final-redhat-4]
at org.apache.catalina.connector.OutputBuffer.doFlush(OutputBuffer.java:358) [jbossweb-7.4.8.Final-redhat-4.jar:7.4.8.Final-redhat-4]
at org.apache.catalina.connector.OutputBuffer.close(OutputBuffer.java:324) [jbossweb-7.4.8.Final-redhat-4.jar:7.4.8.Final-redhat-4]
at org.apache.catalina.connector.Response.finishResponse(Response.java:487) [jbossweb-7.4.8.Final-redhat-4.jar:7.4.8.Final-redhat-4]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:375) [jbossweb-7.4.8.Final-redhat-4.jar:7.4.8.Final-redhat-4]
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856) [jbossweb-7.4.8.Final-redhat-4.jar:7.4.8.Final-redhat-4]
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:653) [jbossweb-7.4.8.Final-redhat-4.jar:7.4.8.Final-redhat-4]
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:926) [jbossweb-7.4.8.Final-redhat-4.jar:7.4.8.Final-redhat-4]
at java.lang.Thread.run(Unknown Source) [rt.jar:1.7.0_55]
14:24:38,112 ERROR [org.apache.coyote.http11] (http-/193.16.1.68:8330-25) JBWEB003073: Error finishing response: java.lang.NullPointerException
at org.apache.tomcat.util.http.MimeHeaders.setValue(MimeHeaders.java:381) [jbossweb-7.4.8.Final-redhat-4.jar:7.4.8.Final-redhat-4]
at org.apache.coyote.http11.Http11Processor.prepareResponse(Http11Processor.java:1558) [jbossweb-7.4.8.Final-redhat-4.jar:7.4.8.Final-redhat-4]
at org.apache.coyote.http11.Http11Processor.action(Http11Processor.java:977) [jbossweb-7.4.8.Final-redhat-4.jar:7.4.8.Final-redhat-4]
at org.apache.coyote.Response.action(Response.java:188) [jbossweb-7.4.8.Final-redhat-4.jar:7.4.8.Final-redhat-4]
at org.apache.coyote.http11.InternalOutputBuffer.endRequest(InternalOutputBuffer.java:347) [jbossweb-7.4.8.Final-redhat-4.jar:7.4.8.Final-redhat-4]
at org.apache.coyote.http11.Http11Processor.endRequest(Http11Processor.java:937) [jbossweb-7.4.8.Final-redhat-4.jar:7.4.8.Final-redhat-4]
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:883) [jbossweb-7.4.8.Final-redhat-4.jar:7.4.8.Final-redhat-4]
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:653) [jbossweb-7.4.8.Final-redhat-4.jar:7.4.8.Final-redhat-4]
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:926) [jbossweb-7.4.8.Final-redhat-4.jar:7.4.8.Final-redhat-4]
at java.lang.Thread.run(Unknown Source) [rt.jar:1.7.0_55]
有任何建议吗？
祝你好运， Abdulghaffar