Exception in thread "pool-1-thread-7" java.lang.NullPointerException
    at sun.net.httpserver.ExchangeImpl.close(ExchangeImpl.java:88)
    at sun.net.httpserver.HttpExchangeImpl.close(HttpExchangeImpl.java:49)
    at com.sun.xml.ws.transport.http.server.ServerConnectionImpl.close(ServerConnectionImpl.java:153)
    at com.sun.xml.ws.transport.http.server.WSHttpHandler.process(WSHttpHandler.java:133)
    at com.sun.xml.ws.transport.http.server.WSHttpHandler.handle(WSHttpHandler.java:92)
    at com.sun.net.httpserver.Filter$Chain.doFilter(Filter.java:65)
    at sun.net.httpserver.ServerImpl$Exchange.run(ServerImpl.java:459)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:650)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:675)
    at java.lang.Thread.run(Thread.java:595)