java - RestTemplate + ConnectionPoolTimeoutException: Timeout waiting for connection from pool -

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i got error of sudden in production while application not under load.

the issue happened when code tries send put message using spring rest template

here code how initialing resttemplate

private static final resttemplate resttemplate = new resttemplate(new httpcomponentsclienthttprequestfactory()); {      list<httpmessageconverter<?>> messageconverters = new arraylist<httpmessageconverter<?>>();     jaxb2marshaller marshaller = new jaxb2marshaller();     marshaller.setclassestobebound(paymentsession.class);     marshallinghttpmessageconverter marshallinghttpmessageconverter = new marshallinghttpmessageconverter(marshaller, marshaller);     marshallinghttpmessageconverter.setsupportedmediatypes(arrays.aslist(mediatype.application_xml, mediatype.text_html));     messageconverters.add(marshallinghttpmessageconverter);     resttemplate.setmessageconverters(messageconverters); }

call put

try {     httpheaders headers = new httpheaders();     headers.setcontenttype(mediatype.application_xml);     httpentity<paymentsession> httpentity = new httpentity<paymentsession>(session, headers);      resttemplate.exchange(baseurl+"/v1/psps", httpmethod.put, httpentity, paymentsession.class);  }catch(httpclienterrorexception e){         logger.error("exception..!!",e) }

exception stacktrace

caused by: org.apache.http.conn.connectionpooltimeoutexception: timeout waiting connection pool @ org.apache.http.impl.conn.poolingclientconnectionmanager.leaseconnection(poolingclientconnectionmanager.java:232) @ org.apache.http.impl.conn.poolingclientconnectionmanager$1.getconnection(poolingclientconnectionmanager.java:199) @ org.apache.http.impl.client.defaultrequestdirector.execute(defaultrequestdirector.java:456) @ org.apache.http.impl.client.abstracthttpclient.execute(abstracthttpclient.java:906) @ org.apache.http.impl.client.abstracthttpclient.execute(abstracthttpclient.java:805) @ org.springframework.http.client.httpcomponentsclienthttprequest.executeinternal(httpcomponentsclienthttprequest.java:88) @ org.springframework.http.client.abstractbufferingclienthttprequest.executeinternal(abstractbufferingclienthttprequest.java:46) @ org.springframework.http.client.abstractclienthttprequest.execute(abstractclienthttprequest.java:49) @ org.springframework.web.client.resttemplate.doexecute(resttemplate.java:509)

i suggest configure httpcomponentsclienthttprequestfactory instance being passed in constructor of resttemplate increasing defaultmaxperroute or maxperroute specific http route requests timing out, increasing pool size not enough, mentioned in comment, if set poolinghttpclientconnectionmanager.setmaxtotal() 200, httpcomponentsclienthttprequestfactory uses defaultmaxperroute of 4, guess in attempt host route (scheme, host, port) not hijack connection pool)

... public poolinghttpclientconnectionmanager poolinghttpclientconnectionmanager() {         poolinghttpclientconnectionmanager result = new poolinghttpclientconnectionmanager();         result.setmaxtotal(this.httphostconfiguration.getmaxtotal());         // default max per route used in case it's not set specific route         result.setdefaultmaxperroute(this.httphostconfiguration.getdefaultmaxperroute());         // , / or         if (collectionutils.isnotempty(this.httphostconfiguration.getmaxperroutes())) {             (httphostconfiguration httphostconfig : this.httphostconfiguration.getmaxperroutes()) {                 httphost host = new httphost(httphostconfig.gethost(), httphostconfig.getport(), httphostconfig.getscheme());                 // max per route specific host route                 result.setmaxperroute(new httproute(host), httphostconfig.getmaxperroute());             }         }         return result;     }   ...   @configuration @configurationproperties(prefix = "httpconnpool") public class httphostsconfiguration {    private integer maxtotal;   private integer defaultmaxperroute;   private list<httphostconfiguration> maxperroutes;    // getters, setters ...

application.yml

httpconnpool:   maxtotal: 20   defaultmaxperroute: 20   maxperroutes:     -       scheme: http       host: localhost       port: 8800       maxperroute: 20

i blog troubleshooting spring's resttemplate requests timeout requests timing out troubleshooted using jmeter , shell commands , fixed via configuration settings.


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