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HikariCP-接続は利用できません

プロジェクトにはSpring-boot/Hibernate/PostgreSQLアプリケーションがあり、Hikariを接続プールとして使用しています。次の問題が発生し続けます：数時間後にアクティブな接続数が制限に達すると、次のようなエラーが表示されます（完全なスタックトレースは質問の最後にあります）。

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

バージョン情報は次のとおりです。

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の構成：

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設定：

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=<masked>, 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........................<masked>
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.)

完全なスタックトレース：

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(<generated>) ~[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(<generated>) ~[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(<generated>) ~[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(<generated>) ~[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)

任意の手がかりが役立つでしょう！

hibernatepostgresqlspring-boothikaricp
41
dfche

やっと修正できました。この問題は、HikariCPとは関係ありません。 JPAリポジトリを介してDBで複数の変更を実行するRESTコントローラーのいくつかの複雑なメソッドが原因で、問題は持続しました。いくつかの理由で、これらのインターフェイスを呼び出すと、「フリーズ」アクティブ接続の数が増え、プールが使い果たされます。これらのメソッドに@Transactionalとして注釈を付けるか、トランザクションサービスメソッドへの1回の呼び出しですべてのロジックを囲むことで問題が解決するようです。

29
dfche

スタックトレースから：

HikariPool：タイムアウトエラープールHikariPool-0の統計（合計= 20、アクティブ= 20、アイドル= 0、待機= 0）プールが構成で設定された最大接続制限に達したことを意味します。

次の行：HikariPool-0-接続は利用できません。30000ms後にリクエストがタイムアウトしました。プールは無料接続を30000ms待機しましたが、その間アプリケーションは接続を返しませんでした。

ほとんどは接続リークです（プールからの借用後に接続は閉じられません）。leakDetectionThresholdを、SQLクエリの実行に必要な最大値に設定します。

そうでない場合、「一度に」の最大接続要件は20を超えます！

19
Nitin