java - getWebServiceTemplate with HttpComponentsMessageSender not maintaining connections -

i have been searching 2 days answer problem cannot find it.

i have client consuming soap service. use springs getwebservicetemplate().marshalsendandreceive(request, new securityheader(..))

i need able send 100 requests/sec , given service replies @ 460ms on average figured should create threadpool 50 threads make concurrent requests. furthermore, setting client

@bean public httpcomponentsmessagesender messagesender() {      final poolinghttpclientconnectionmanager connmanager = new poolinghttpclientconnectionmanager();     connmanager.setmaxtotal(100);     connmanager.setdefaultmaxperroute(55);      final requestconfig reqconf = requestconfig.custom()             .setconnectionrequesttimeout(5000)             .setconnecttimeout(5000)             .setsockettimeout(5000)             .build();     final closeablehttpclient httpclient = httpclients.custom().setconnectionmanager(connmanager)             .setdefaultrequestconfig(reqconf)             .addinterceptorfirst(new httpcomponentsmessagesender.removesoapheadersinterceptor()).build();     final httpcomponentsmessagesender messagesender = new httpcomponentsmessagesender(httpclient);      return messagesender; } 

and in client extending webservicegatewaysupport class:

@autowired public transactionclientimpl(jaxb2marshaller transactionmarshaller,         httpcomponentsmessagesender messagesender) {     this.setmarshaller(transactionmarshaller);     this.setunmarshaller(transactionmarshaller);     this.setmessagesender(messagesender);  } 

i have used many times in past working well. now, in case see when start process using client make requests service netstat shows correct 55 connections established target host. after 30-40 seconds connections fall 20-27 , stay there. if pause , resume service again come 55 , after while again drop 20-27.

the treads not seem die see in logs thead names being 50, 49, 1 etc. have tried more 55 200 (increasing threads well) still same thing happens.

i @ loss here. suspecting connection leak first suppose spring correctly handling , secondly drop sudden , stays days.