HikariCP - connection is not available

Question

We have Spring-boot Hibernate PostgreSQL application in our project and use Hikari as the connection pool  We keep running into the following problem  after few hours active connections number grows to the limit and we get the errors like this  full stack trace is at the end of the question    Caused by  java sql SQLTransientConnectionException  HikariPool-0 - Connection is not available  request timed out after 30000ms      at com zaxxer hikari pool HikariPool getConnection HikariPool java 213    HikariCP-2 4 1 jar na      at com zaxxer hikari pool HikariPool getConnection HikariPool java 163    HikariCP-2 4 1 jar na      at com zaxxer hikari HikariDataSource getConnection HikariDataSource java 85    HikariCP-2 4 1 jar na      at org hibernate engine jdbc connections internal DatasourceConnectionProviderImpl getConnection DatasourceConnectionProviderImpl java 139    hibernate-core-4 3 6 Final jar 4 3 6 Final      at org hibernate internal AbstractSessionImpl NonContextualJdbcConnectionAccess obtainConnection AbstractSessionImpl java 380    hibernate-core-4 3 6 Final jar 4 3 6 Final      at org hibernate engine jdbc internal LogicalConnectionImpl obtainConnection LogicalConnectionImpl java 228    hibernate-core-4 3 6 Final jar 4 3 6 Final          126 common frames omitted   Here is the version info   Spring-boot version    1 2 3 RELEASE HikariCP version       2 4 1 Hibernate version      4 3 6 Final Postgresql jdbc        9 3-1102-jdbc41 Server version         Apache Tomcat 8 0 23 JVM Version            1 8 0 45-b14   JPA Hibernate config   jpa      database-platform  org hibernate dialect PostgreSQL82Dialect     database  POSTGRESQL     openInView  false     show sql  false     generate-ddl  false     hibernate          ddl-auto  none         naming-strategy  org hibernate cfg EJB3NamingStrategy     properties          hibernate cache use second level cache  true         hibernate cache use query cache  false         hibernate generate statistics  false         hibernate cache region factory class  org hibernate cache ehcache SingletonEhCacheRegionFactory         hibernate enable lazy load no trans  true         hibernate event merge entity copy observer  allow   HikariCP config   2015-10-06 12 26 44 252 DEBUG  localhost-startStop-1  HikariConfig  HikariPool-0 - configuration  2015-10-06 12 26 44 274 DEBUG  localhost-startStop-1  HikariConfig  allowPoolSuspension             false 2015-10-06 12 26 44 274 DEBUG  localhost-startStop-1  HikariConfig  autoCommit                      true 2015-10-06 12 26 44 274 DEBUG  localhost-startStop-1  HikariConfig  catalog                          2015-10-06 12 26 44 274 DEBUG  localhost-startStop-1  HikariConfig  connectionInitSql                2015-10-06 12 26 44 274 DEBUG  localhost-startStop-1  HikariConfig  connectionTestQuery              2015-10-06 12 26 44 274 DEBUG  localhost-startStop-1  HikariConfig  connectionTimeout               30000 2015-10-06 12 26 44 274 DEBUG  localhost-startStop-1  HikariConfig  dataSource                       2015-10-06 12 26 44 274 DEBUG  localhost-startStop-1  HikariConfig  dataSourceClassName             org postgresql ds PGSimpleDataSource 2015-10-06 12 26 44 274 DEBUG  localhost-startStop-1  HikariConfig  dataSourceJNDI                   2015-10-06 12 26 44 274 DEBUG  localhost-startStop-1  HikariConfig  dataSourceProperties             user postgres  password  lt masked gt   databaseName lms  serverName         5432  2015-10-06 12 26 44 274 DEBUG  localhost-startStop-1  HikariConfig  driverClassName                  2015-10-06 12 26 44 274 DEBUG  localhost-startStop-1  HikariConfig  healthCheckProperties              2015-10-06 12 26 44 274 DEBUG  localhost-startStop-1  HikariConfig  healthCheckRegistry              2015-10-06 12 26 44 274 DEBUG  localhost-startStop-1  HikariConfig  idleTimeout                     30000 2015-10-06 12 26 44 275 DEBUG  localhost-startStop-1  HikariConfig  initializationFailFast          true 2015-10-06 12 26 44 275 DEBUG  localhost-startStop-1  HikariConfig  isolateInternalQueries          false 2015-10-06 12 26 44 275 DEBUG  localhost-startStop-1  HikariConfig  jdbc4ConnectionTest             false 2015-10-06 12 26 44 275 DEBUG  localhost-startStop-1  HikariConfig  jdbcUrl                          2015-10-06 12 26 44 275 DEBUG  localhost-startStop-1  HikariConfig  leakDetectionThreshold          0 2015-10-06 12 26 44 275 DEBUG  localhost-startStop-1  HikariConfig  maxLifetime                     1800000 2015-10-06 12 26 44 275 DEBUG  localhost-startStop-1  HikariConfig  maximumPoolSize                 20 2015-10-06 12 26 44 275 DEBUG  localhost-startStop-1  HikariConfig  metricRegistry                  com codahale metrics MetricRegistry 63d2fc48 2015-10-06 12 26 44 275 DEBUG  localhost-startStop-1  HikariConfig  metricsTrackerFactory            2015-10-06 12 26 44 275 DEBUG  localhost-startStop-1  HikariConfig  minimumIdle                     10 2015-10-06 12 26 44 275 DEBUG  localhost-startStop-1  HikariConfig  password                         lt masked gt  2015-10-06 12 26 44 275 DEBUG  localhost-startStop-1  HikariConfig  poolName                        HikariPool-0 2015-10-06 12 26 44 275 DEBUG  localhost-startStop-1  HikariConfig  readOnly                        false 2015-10-06 12 26 44 275 DEBUG  localhost-startStop-1  HikariConfig  registerMbeans                  false 2015-10-06 12 26 44 275 DEBUG  localhost-startStop-1  HikariConfig  scheduledExecutorService         2015-10-06 12 26 44 275 DEBUG  localhost-startStop-1  HikariConfig  threadFactory                    2015-10-06 12 26 44 275 DEBUG  localhost-startStop-1  HikariConfig  transactionIsolation             2015-10-06 12 26 44 275 DEBUG  localhost-startStop-1  HikariConfig  username                         2015-10-06 12 26 44 275 DEBUG  localhost-startStop-1  HikariConfig  validationTimeout               5000 2015-10-06 12 26 44 276 INFO   localhost-startStop-1  HikariDataSource  HikariPool-0 - is starting  2015-10-06 12 26 44 432 DEBUG  localhost-startStop-1  PoolElf  HikariPool-0 - Connection setNetworkTimeout   is not supported  Method org postgresql jdbc4 Jdbc4Connection getNetworkTimeout   is not yet implemented     Full stack trace   2015-10-06 12 09 36 885 DEBUG  http-nio-8080-exec-25  PoolElf  HikariPool-0 - Reset  nothing  on connection org postgresql jdbc4 Jdbc4Connection 3cc4d919 2015-10-06 12 09 42 651 DEBUG  Hikari housekeeper  pool HikariPool-0   HikariPool  Before cleanup   pool HikariPool-0 stats  total 20  active 20  idle 0  waiting 1  2015-10-06 12 09 42 652 DEBUG  Hikari housekeeper  pool HikariPool-0   HikariPool  After cleanup    pool HikariPool-0 stats  total 20  active 20  idle 0  waiting 1  2015-10-06 12 10 06 885 DEBUG  http-nio-8080-exec-25  HikariPool  Timeout failure   pool HikariPool-0 stats  total 20  active 20  idle 0  waiting 0  2015-10-06 12 10 06 885 WARN   http-nio-8080-exec-25  SqlExceptionHelper  SQL Error  0  SQLState  null 2015-10-06 12 10 06 885 ERROR  http-nio-8080-exec-25  SqlExceptionHelper  HikariPool-0 - Connection is not available  request timed out after 30000ms  2015-10-06 12 10 06 885 DEBUG  http-nio-8080-exec-25  PoolElf  HikariPool-0 - Reset  nothing  on connection org postgresql jdbc4 Jdbc4Connection 3cc4d919 2015-10-06 12 10 06 886 ERROR  http-nio-8080-exec-25  ErrorPageFilter  Forwarding to error page from request   api courses 121387 quizzes i6fa2562510bf8578712380a87a433e97 student 30175  due to exception  org springframework web util NestedServletException  Request processing failed  nested exception is org hibernate exception JDBCConnectionException  Could not open connection  java lang RuntimeException  org springframework web util NestedServletException  Request processing failed  nested exception is org hibernate exception JDBCConnectionException  Could not open connection     at lms security xauth XAuthTokenFilter doFilter XAuthTokenFilter java 86    XAuthTokenFilter class na      at org springframework security web FilterChainProxy VirtualFilterChain doFilter FilterChainProxy java 330    spring-security-web-4 0 0 RELEASE jar na      at org springframework security web authentication logout LogoutFilter doFilter LogoutFilter java 120    spring-security-web-4 0 0 RELEASE jar na      at org springframework security web FilterChainProxy VirtualFilterChain doFilter FilterChainProxy java 330    spring-security-web-4 0 0 RELEASE jar na      at org springframework security web header HeaderWriterFilter doFilterInternal HeaderWriterFilter java 64    spring-security-web-4 0 0 RELEASE jar na      at org springframework web filter OncePerRequestFilter doFilter OncePerRequestFilter java 107   spring-web-4 1 6 RELEASE jar 4 1 6 RELEASE      at org springframework security web FilterChainProxy VirtualFilterChain doFilter FilterChainProxy java 330    spring-security-web-4 0 0 RELEASE jar na      at org springframework security web context SecurityContextPersistenceFilter doFilter SecurityContextPersistenceFilter java 91    spring-security-web-4 0 0 RELEASE jar na      at org springframework security web FilterChainProxy VirtualFilterChain doFilter FilterChainProxy java 330    spring-security-web-4 0 0 RELEASE jar na      at org springframework security web context request async WebAsyncManagerIntegrationFilter doFilterInternal WebAsyncManagerIntegrationFilter java 53    spring-security-web-4 0 0 RELEASE jar na      at org springframework web filter OncePerRequestFilter doFilter OncePerRequestFilter java 107   spring-web-4 1 6 RELEASE jar 4 1 6 RELEASE      at org springframework security web FilterChainProxy VirtualFilterChain doFilter FilterChainProxy java 330    spring-security-web-4 0 0 RELEASE jar na      at org springframework security web FilterChainProxy doFilterInternal FilterChainProxy java 213    spring-security-web-4 0 0 RELEASE jar na      at org springframework security web FilterChainProxy doFilter FilterChainProxy java 176    spring-security-web-4 0 0 RELEASE jar na      at org apache catalina core ApplicationFilterChain internalDoFilter ApplicationFilterChain java 239   catalina jar 8 0 23      at org apache catalina core ApplicationFilterChain doFilter ApplicationFilterChain java 206   catalina jar 8 0 23      at org springframework boot actuate trace WebRequestTraceFilter doFilterInternal WebRequestTraceFilter java 102    spring-boot-actuator-1 2 3 RELEASE jar 1 2 3 RELEASE      at org springframework web filter OncePerRequestFilter doFilter OncePerRequestFilter java 107   spring-web-4 1 6 RELEASE jar 4 1 6 RELEASE      at org apache catalina core ApplicationFilterChain internalDoFilter ApplicationFilterChain java 239   catalina jar 8 0 23      at org apache catalina core ApplicationFilterChain doFilter ApplicationFilterChain java 206   catalina jar 8 0 23      at org springframework web filter CharacterEncodingFilter doFilterInternal CharacterEncodingFilter java 85    spring-web-4 1 6 RELEASE jar 4 1 6 RELEASE      at org springframework web filter OncePerRequestFilter doFilter OncePerRequestFilter java 107   spring-web-4 1 6 RELEASE jar 4 1 6 RELEASE      at org apache catalina core ApplicationFilterChain internalDoFilter ApplicationFilterChain java 239   catalina jar 8 0 23      at org apache catalina core ApplicationFilterChain doFilter ApplicationFilterChain java 206   catalina jar 8 0 23      at org springframework boot context web ErrorPageFilter doFilter ErrorPageFilter java 113   spring-boot-1 2 3 RELEASE jar 1 2 3 RELEASE      at org springframework boot context web ErrorPageFilter access 000 ErrorPageFilter java 59   spring-boot-1 2 3 RELEASE jar 1 2 3 RELEASE      at org springframework boot context web ErrorPageFilter 1 doFilterInternal ErrorPageFilter java 88   spring-boot-1 2 3 RELEASE jar 1 2 3 RELEASE      at org springframework web filter OncePerRequestFilter doFilter OncePerRequestFilter java 107   spring-web-4 1 6 RELEASE jar 4 1 6 RELEASE      at org springframework boot context web ErrorPageFilter doFilter ErrorPageFilter java 106   spring-boot-1 2 3 RELEASE jar 1 2 3 RELEASE      at org apache catalina core ApplicationFilterChain internalDoFilter ApplicationFilterChain java 239   catalina jar 8 0 23      at org apache catalina core ApplicationFilterChain doFilter ApplicationFilterChain java 206   catalina jar 8 0 23      at org apache catalina core StandardWrapperValve invoke StandardWrapperValve java 219   catalina jar 8 0 23      at org apache catalina core StandardContextValve invoke StandardContextValve java 106   catalina jar 8 0 23      at org apache catalina authenticator AuthenticatorBase invoke AuthenticatorBase java 502   catalina jar 8 0 23      at org apache catalina core StandardHostValve invoke StandardHostValve java 142   catalina jar 8 0 23      at org apache catalina valves ErrorReportValve invoke ErrorReportValve java 79   catalina jar 8 0 23      at org apache catalina valves AbstractAccessLogValve invoke AbstractAccessLogValve java 617   catalina jar 8 0 23      at org apache catalina core StandardEngineValve invoke StandardEngineValve java 88   catalina jar 8 0 23      at org apache catalina connector CoyoteAdapter service CoyoteAdapter java 518   catalina jar 8 0 23      at org apache coyote http11 AbstractHttp11Processor process AbstractHttp11Processor java 1091   tomcat-coyote jar 8 0 23      at org apache coyote AbstractProtocol AbstractConnectionHandler process AbstractProtocol java 668   tomcat-coyote jar 8 0 23      at org apache tomcat util net NioEndpoint SocketProcessor doRun NioEndpoint java 1521   tomcat-coyote jar 8 0 23      at org apache tomcat util net NioEndpoint SocketProcessor run NioEndpoint java 1478   tomcat-coyote jar 8 0 23      at java util concurrent ThreadPoolExecutor runWorker ThreadPoolExecutor java 1142   na 1 8 0 45      at java util concurrent ThreadPoolExecutor Worker run ThreadPoolExecutor java 617   na 1 8 0 45      at org apache tomcat util threads TaskThread WrappingRunnable run TaskThread java 61   tomcat-util jar 8 0 23      at java lang Thread run Thread java 745   na 1 8 0 45  Caused by  org springframework web util NestedServletException  Request processing failed  nested exception is org hibernate exception JDBCConnectionException  Could not open connection     at org springframework web servlet FrameworkServlet processRequest FrameworkServlet java 978    spring-webmvc-4 1 6 RELEASE jar 4 1 6 RELEASE      at org springframework web servlet FrameworkServlet doPost FrameworkServlet java 868    spring-webmvc-4 1 6 RELEASE jar 4 1 6 RELEASE      at javax servlet http HttpServlet service HttpServlet java 648    servlet-api jar na      at org springframework web servlet FrameworkServlet service FrameworkServlet java 842    spring-webmvc-4 1 6 RELEASE jar 4 1 6 RELEASE      at javax servlet http HttpServlet service HttpServlet java 729    servlet-api jar na      at org apache catalina core ApplicationFilterChain internalDoFilter ApplicationFilterChain java 291   catalina jar 8 0 23      at org apache catalina core ApplicationFilterChain doFilter ApplicationFilterChain java 206   catalina jar 8 0 23      at com codahale metrics servlet AbstractInstrumentedFilter doFilter AbstractInstrumentedFilter java 104    metrics-servlet-3 1 1 jar 3 1 1      at org apache catalina core ApplicationFilterChain internalDoFilter ApplicationFilterChain java 239   catalina jar 8 0 23      at org apache catalina core ApplicationFilterChain doFilter ApplicationFilterChain java 206   catalina jar 8 0 23      at org apache tomcat websocket server WsFilter doFilter WsFilter java 52    tomcat-websocket jar 8 0 23      at org apache catalina core ApplicationFilterChain internalDoFilter ApplicationFilterChain java 239   catalina jar 8 0 23      at org apache catalina core ApplicationFilterChain doFilter ApplicationFilterChain java 206   catalina jar 8 0 23      at org springframework boot actuate autoconfigure EndpointWebMvcAutoConfiguration ApplicationContextHeaderFilter doFilterInternal EndpointWebMvcAutoConfiguration java 291    spring-boot-actuator-1 2 3 RELEASE jar 1 2 3 RELEASE      at org springframework web filter OncePerRequestFilter doFilter OncePerRequestFilter java 107   spring-web-4 1 6 RELEASE jar 4 1 6 RELEASE      at org apache catalina core ApplicationFilterChain internalDoFilter ApplicationFilterChain java 239   catalina jar 8 0 23      at org apache catalina core ApplicationFilterChain doFilter ApplicationFilterChain java 206   catalina jar 8 0 23      at org springframework web filter HiddenHttpMethodFilter doFilterInternal HiddenHttpMethodFilter java 77    spring-web-4 1 6 RELEASE jar 4 1 6 RELEASE      at org springframework web filter OncePerRequestFilter doFilter OncePerRequestFilter java 107   spring-web-4 1 6 RELEASE jar 4 1 6 RELEASE      at org apache catalina core ApplicationFilterChain internalDoFilter ApplicationFilterChain java 239   catalina jar 8 0 23      at org apache catalina core ApplicationFilterChain doFilter ApplicationFilterChain java 206   catalina jar 8 0 23      at org springframework security web FilterChainProxy VirtualFilterChain doFilter FilterChainProxy java 316    spring-security-web-4 0 0 RELEASE jar na      at org springframework security web access intercept FilterSecurityInterceptor invoke FilterSecurityInterceptor java 126    spring-security-web-4 0 0 RELEASE jar na      at org springframework security web access intercept FilterSecurityInterceptor doFilter FilterSecurityInterceptor java 90    spring-security-web-4 0 0 RELEASE jar na      at org springframework security web FilterChainProxy VirtualFilterChain doFilter FilterChainProxy java 330    spring-security-web-4 0 0 RELEASE jar na      at org springframework security web access ExceptionTranslationFilter doFilter ExceptionTranslationFilter java 114    spring-security-web-4 0 0 RELEASE jar na      at org springframework security web FilterChainProxy VirtualFilterChain doFilter FilterChainProxy java 330    spring-security-web-4 0 0 RELEASE jar na      at org springframework security web session SessionManagementFilter doFilter SessionManagementFilter java 122    spring-security-web-4 0 0 RELEASE jar na      at org springframework security web FilterChainProxy VirtualFilterChain doFilter FilterChainProxy java 330    spring-security-web-4 0 0 RELEASE jar na      at org springframework security web authentication AnonymousAuthenticationFilter doFilter AnonymousAuthenticationFilter java 111    spring-security-web-4 0 0 RELEASE jar na      at org springframework security web FilterChainProxy VirtualFilterChain doFilter FilterChainProxy java 330    spring-security-web-4 0 0 RELEASE jar na      at org springframework security web servletapi SecurityContextHolderAwareRequestFilter doFilter SecurityContextHolderAwareRequestFilter java 168    spring-security-web-4 0 0 RELEASE jar na      at org springframework security web FilterChainProxy VirtualFilterChain doFilter FilterChainProxy java 330    spring-security-web-4 0 0 RELEASE jar na      at org springframework security web savedrequest RequestCacheAwareFilter doFilter RequestCacheAwareFilter java 48    spring-security-web-4 0 0 RELEASE jar na      at org springframework security web FilterChainProxy VirtualFilterChain doFilter FilterChainProxy java 330    spring-security-web-4 0 0 RELEASE jar na      at lms security xauth XAuthTokenFilter doFilter XAuthTokenFilter java 84    XAuthTokenFilter class na          46 common frames omitted Caused by  org hibernate exception JDBCConnectionException  Could not open connection     at org hibernate exception internal SQLExceptionTypeDelegate convert SQLExceptionTypeDelegate java 65    hibernate-core-4 3 6 Final jar 4 3 6 Final      at org hibernate exception internal StandardSQLExceptionConverter convert StandardSQLExceptionConverter java 49    hibernate-core-4 3 6 Final jar 4 3 6 Final      at org hibernate engine jdbc spi SqlExceptionHelper convert SqlExceptionHelper java 126    hibernate-core-4 3 6 Final jar 4 3 6 Final      at org hibernate engine jdbc spi SqlExceptionHelper convert SqlExceptionHelper java 112    hibernate-core-4 3 6 Final jar 4 3 6 Final      at org hibernate engine jdbc internal LogicalConnectionImpl obtainConnection LogicalConnectionImpl java 235    hibernate-core-4 3 6 Final jar 4 3 6 Final      at org hibernate engine jdbc internal LogicalConnectionImpl getConnection LogicalConnectionImpl java 171    hibernate-core-4 3 6 Final jar 4 3 6 Final      at org hibernate engine transaction internal jdbc JdbcTransaction doBegin JdbcTransaction java 67    hibernate-core-4 3 6 Final jar 4 3 6 Final      at org hibernate engine transaction spi AbstractTransactionImpl begin AbstractTransactionImpl java 162    hibernate-core-4 3 6 Final jar 4 3 6 Final      at org hibernate internal SessionImpl beginTransaction SessionImpl java 1435    hibernate-core-4 3 6 Final jar 4 3 6 Final      at org hibernate collection internal AbstractPersistentCollection withTemporarySessionIfNeeded AbstractPersistentCollection java 250    hibernate-core-4 3 6 Final jar 4 3 6 Final      at org hibernate collection internal AbstractPersistentCollection readElementByIndex AbstractPersistentCollection java 376    hibernate-core-4 3 6 Final jar 4 3 6 Final      at org hibernate collection internal PersistentMap get PersistentMap java 164    hibernate-core-4 3 6 Final jar 4 3 6 Final      at java util Map get call Unknown Source    na na      at lms service QuizService processAnswers QuizService groovy 66    QuizService class na      at lms service QuizService  FastClassBySpringCGLIB  4dcc8beb invoke  lt generated gt     spring-core-4 1 6 RELEASE jar na      at org springframework cglib proxy MethodProxy invoke MethodProxy java 204    spring-core-4 1 6 RELEASE jar 4 1 6 RELEASE      at org springframework aop framework CglibAopProxy CglibMethodInvocation invokeJoinpoint CglibAopProxy java 717    spring-aop-4 1 6 RELEASE jar 4 1 6 RELEASE      at org springframework aop framework ReflectiveMethodInvocation proceed ReflectiveMethodInvocation java 157    spring-aop-4 1 6 RELEASE jar 4 1 6 RELEASE      at org springframework transaction interceptor TransactionInterceptor 1 proceedWithInvocation TransactionInterceptor java 99    spring-tx-4 1 6 RELEASE jar 4 1 6 RELEASE      at org springframework transaction interceptor TransactionAspectSupport invokeWithinTransaction TransactionAspectSupport java 281    spring-tx-4 1 6 RELEASE jar 4 1 6 RELEASE      at org springframework transaction interceptor TransactionInterceptor invoke TransactionInterceptor java 96    spring-tx-4 1 6 RELEASE jar 4 1 6 RELEASE      at org springframework aop framework ReflectiveMethodInvocation proceed ReflectiveMethodInvocation java 179    spring-aop-4 1 6 RELEASE jar 4 1 6 RELEASE      at org springframework aop framework CglibAopProxy DynamicAdvisedInterceptor intercept CglibAopProxy java 653    spring-aop-4 1 6 RELEASE jar 4 1 6 RELEASE      at lms service QuizService  EnhancerBySpringCGLIB  37a60c0a processAnswers  lt generated gt     spring-core-4 1 6 RELEASE jar na      at lms web rest CourseResource saveQuizResults CourseResource java 537    CourseResource class na      at lms web rest CourseResource  FastClassBySpringCGLIB  e3d2ba4d invoke  lt generated gt     spring-core-4 1 6 RELEASE jar na      at org springframework cglib proxy MethodProxy invoke MethodProxy java 204    spring-core-4 1 6 RELEASE jar 4 1 6 RELEASE      at org springframework aop framework CglibAopProxy CglibMethodInvocation invokeJoinpoint CglibAopProxy java 717    spring-aop-4 1 6 RELEASE jar 4 1 6 RELEASE      at org springframework aop framework ReflectiveMethodInvocation proceed ReflectiveMethodInvocation java 157    spring-aop-4 1 6 RELEASE jar 4 1 6 RELEASE      at org springframework security access intercept aopalliance MethodSecurityInterceptor invoke MethodSecurityInterceptor java 68    spring-security-core-4 0 0 RELEASE jar na      at org springframework aop framework ReflectiveMethodInvocation proceed ReflectiveMethodInvocation java 179    spring-aop-4 1 6 RELEASE jar 4 1 6 RELEASE      at com ryantenney metrics spring TimedMethodInterceptor invoke TimedMethodInterceptor java 48    metrics-spring-3 0 4 jar na      at com ryantenney metrics spring TimedMethodInterceptor invoke TimedMethodInterceptor java 34    metrics-spring-3 0 4 jar na      at com ryantenney metrics spring AbstractMetricMethodInterceptor invoke AbstractMetricMethodInterceptor java 59    metrics-spring-3 0 4 jar na      at org springframework aop framework ReflectiveMethodInvocation proceed ReflectiveMethodInvocation java 179    spring-aop-4 1 6 RELEASE jar 4 1 6 RELEASE      at org springframework aop framework CglibAopProxy DynamicAdvisedInterceptor intercept CglibAopProxy java 653    spring-aop-4 1 6 RELEASE jar 4 1 6 RELEASE      at lms web rest CourseResource  EnhancerBySpringCGLIB  ff854301 saveQuizResults  lt generated gt     spring-core-4 1 6 RELEASE jar na      at sun reflect NativeMethodAccessorImpl invoke0 Native Method    na 1 8 0 45      at sun reflect NativeMethodAccessorImpl invoke NativeMethodAccessorImpl java 62    na 1 8 0 45      at sun reflect DelegatingMethodAccessorImpl invoke DelegatingMethodAccessorImpl java 43    na 1 8 0 45      at java lang reflect Method invoke Method java 497    na 1 8 0 45      at org springframework web method support InvocableHandlerMethod doInvoke InvocableHandlerMethod java 221    spring-web-4 1 6 RELEASE jar 4 1 6 RELEASE      at org springframework web method support InvocableHandlerMethod invokeForRequest InvocableHandlerMethod java 137    spring-web-4 1 6 RELEASE jar 4 1 6 RELEASE      at org springframework web servlet mvc method annotation ServletInvocableHandlerMethod invokeAndHandle ServletInvocableHandlerMethod java 110    spring-webmvc-4 1 6 RELEASE jar 4 1 6 RELEASE      at org springframework web servlet mvc method annotation RequestMappingHandlerAdapter invokeHandleMethod RequestMappingHandlerAdapter java 776    spring-webmvc-4 1 6 RELEASE jar 4 1 6 RELEASE      at org springframework web servlet mvc method annotation RequestMappingHandlerAdapter handleInternal RequestMappingHandlerAdapter java 705    spring-webmvc-4 1 6 RELEASE jar 4 1 6 RELEASE      at org springframework web servlet mvc method AbstractHandlerMethodAdapter handle AbstractHandlerMethodAdapter java 85    spring-webmvc-4 1 6 RELEASE jar 4 1 6 RELEASE      at org springframework web servlet DispatcherServlet doDispatch DispatcherServlet java 959    spring-webmvc-4 1 6 RELEASE jar 4 1 6 RELEASE      at org springframework web servlet DispatcherServlet doService DispatcherServlet java 893    spring-webmvc-4 1 6 RELEASE jar 4 1 6 RELEASE      at org springframework web servlet FrameworkServlet processRequest FrameworkServlet java 966    spring-webmvc-4 1 6 RELEASE jar 4 1 6 RELEASE          81 common frames omitted Caused by  java sql SQLTransientConnectionException  HikariPool-0 - Connection is not available  request timed out after 30000ms      at com zaxxer hikari pool HikariPool getConnection HikariPool java 213    HikariCP-2 4 1 jar na      at com zaxxer hikari pool HikariPool getConnection HikariPool java 163    HikariCP-2 4 1 jar na      at com zaxxer hikari HikariDataSource getConnection HikariDataSource java 85    HikariCP-2 4 1 jar na      at org hibernate engine jdbc connections internal DatasourceConnectionProviderImpl getConnection DatasourceConnectionProviderImpl java 139    hibernate-core-4 3 6 Final jar 4 3 6 Final      at org hibernate internal AbstractSessionImpl NonContextualJdbcConnectionAccess obtainConnection AbstractSessionImpl java 380    hibernate-core-4 3 6 Final jar 4 3 6 Final      at org hibernate engine jdbc internal LogicalConnectionImpl obtainConnection LogicalConnectionImpl java 228    hibernate-core-4 3 6 Final jar 4 3 6 Final          126 common frames omitted 2015-10-06 12 10 12 651 DEBUG  Hikari housekeeper  pool HikariPool-0   HikariPool  Before cleanup   pool HikariPool-0 stats  total 20  active 19  idle 1  waiting 0  2015-10-06 12 10 12 652 DEBUG  Hikari housekeeper  pool HikariPool-0   HikariPool  After cleanup    pool HikariPool-0 stats  total 20  active 19  idle 1  waiting 0    Any clue would be helpful

User · Answer

From stack trace   HikariPool  Timeout failure   pool HikariPool-0 stats  total 20  active 20  idle 0  waiting 0  Means pool reached maximum connections limit set in configuration   The next line  HikariPool-0 - Connection is not available  request timed out after 30000ms  Means pool waited 30000ms for free connection but your application not returned any connection meanwhile   Mostly it is connection leak  connection is not closed after borrowing from pool   set leakDetectionThreshold to the maximum value that you expect SQL query would take to execute   otherwise  your maximum connections  at a time  requirement is higher than 20

User · Answer

I managed to fix it finally  The problem is not related to HikariCP  The problem persisted because of some complex methods in REST controllers executing multiple changes in DB through JPA repositories  For some reasons calls to these interfaces resulted in a growing number of  freezed  active connections  exhausting the pool  Either annotating these methods as  Transactional or enveloping all the logic in a single call to transactional service method seem to solve the problem

[hibernate] HikariCP - connection is not available

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