接続が閉じられている場合、Springクライアントはプールから接続を取得する必要があります

私の会社は比較的新しいSpringです。これはフレームワークの最初のプロダクション実装になります。そのため、新しい方法に移行するという苦労があります。接続が閉じられている場合、Springクライアントはプールから接続を取得する必要があります

とにかく、この新しいアプリケーションは以前のパスワードマネージャーに代わるものなので、いつでもクライアントからアクセスできる必要があります。私たちが持っている問題は、私たちが望むように、あまりにも長い間活動がないため、フロントエンドの接続が放棄されるということです。ユーザーが午前中にワークステーションに戻ったときなど、接続を元に戻したいときに問題が発生します。私は数日間見回してしまって助けてくれるものが見つからないように見えるかもしれませんが、おそらくそれは見た目よりも簡単に修正することができます。データベースとして私たちは、JPAエンジンとして休止状態を使用している

private String _getConnectionUrl() { 
    /* mysql connections on tomcat crash overnight. 
    * Probably need to investigate autoreconnect 
    * https://dev.mysql.com/doc/connector-j/5.1/en/connector-j-reference-configuration-properties.html 
    */ 
    return String.format("jdbc:mysql://%s:3306/%s",_dbHost,_dbSchema); 
} 


/** 
* gets the datasource associated with this connection 
* @return 
*/ 
public DataSource getDataSource() { 

    if(_dataSource==null) { 
     _log.info(String.format("Creating DataSource to %s",_getConnectionUrl())); 

     PoolProperties p = new PoolProperties(); 
      p.setUrl(_getConnectionUrl()); 
      p.setDriverClassName("com.mysql.jdbc.Driver"); 
      p.setUsername(_dbUsername); 
      p.setPassword(_dbPassword); 
      p.setJmxEnabled(true); 
      p.setTestWhileIdle(false); 
      p.setTestOnBorrow(true); 
      p.setValidationQuery("SELECT 1"); 
      p.setTestOnReturn(false); 
      p.setValidationInterval(30000); 
      p.setTimeBetweenEvictionRunsMillis(30000); 
      p.setMaxActive(100); 
      p.setInitialSize(10); 
      p.setMaxWait(10000); 
      p.setRemoveAbandonedTimeout(60); 
      p.setMinEvictableIdleTimeMillis(30000); 
      p.setMinIdle(10); 
      p.setLogAbandoned(true); 
      p.setRemoveAbandoned(true); 
      p.setJdbcInterceptors(
      "org.apache.tomcat.jdbc.pool.interceptor.ConnectionState;"+ 
      "org.apache.tomcat.jdbc.pool.interceptor.StatementFinalizer;" + 
      "org.apache.tomcat.jdbc.pool.interceptor.ResetAbandonedTimer"); 
     _dataSource = new DataSource(); 
     _dataSource.setPoolProperties(p); 
    } 

    return _dataSource; 

}

、とのMySQL5：

データベースの設定。

私はリクエストによりより多くのコードを提供することができます。接続が放棄された後に、エラーのため

スタックトレース：

java.sql.SQLException: Connection has already been closed. 
at org.apache.tomcat.jdbc.pool.ProxyConnection.invoke(ProxyConnection.java:117) ~[tomcat-jdbc-8.5.15.jar:na] 
at org.apache.tomcat.jdbc.pool.JdbcInterceptor.invoke(JdbcInterceptor.java:108) ~[tomcat-jdbc-8.5.15.jar:na] 
at org.apache.tomcat.jdbc.pool.interceptor.AbstractCreateStatementInterceptor.invoke(AbstractCreateStatementInterceptor.java:79) ~[tomcat-jdbc-8.5.15.jar:na] 
at org.apache.tomcat.jdbc.pool.interceptor.ResetAbandonedTimer.invoke(ResetAbandonedTimer.java:60) ~[tomcat-jdbc-8.5.15.jar:na] 
at org.apache.tomcat.jdbc.pool.JdbcInterceptor.invoke(JdbcInterceptor.java:108) ~[tomcat-jdbc-8.5.15.jar:na] 
at org.apache.tomcat.jdbc.pool.interceptor.AbstractCreateStatementInterceptor.invoke(AbstractCreateStatementInterceptor.java:79) ~[tomcat-jdbc-8.5.15.jar:na] 
at org.apache.tomcat.jdbc.pool.JdbcInterceptor.invoke(JdbcInterceptor.java:108) ~[tomcat-jdbc-8.5.15.jar:na] 
at org.apache.tomcat.jdbc.pool.interceptor.ConnectionState.invoke(ConnectionState.java:152) ~[tomcat-jdbc-8.5.15.jar:na] 
at org.apache.tomcat.jdbc.pool.JdbcInterceptor.invoke(JdbcInterceptor.java:108) ~[tomcat-jdbc-8.5.15.jar:na] 
at org.apache.tomcat.jdbc.pool.TrapException.invoke(TrapException.java:40) ~[tomcat-jdbc-8.5.15.jar:na] 
at org.apache.tomcat.jdbc.pool.JdbcInterceptor.invoke(JdbcInterceptor.java:108) ~[tomcat-jdbc-8.5.15.jar:na] 
at org.apache.tomcat.jdbc.pool.interceptor.AbstractCreateStatementInterceptor.invoke(AbstractCreateStatementInterceptor.java:79) ~[tomcat-jdbc-8.5.15.jar:na] 
at org.apache.tomcat.jdbc.pool.JdbcInterceptor.invoke(JdbcInterceptor.java:108) ~[tomcat-jdbc-8.5.15.jar:na] 
at org.apache.tomcat.jdbc.pool.DisposableConnectionFacade.invoke(DisposableConnectionFacade.java:81) ~[tomcat-jdbc-8.5.15.jar:na] 
at com.sun.proxy.$Proxy67.setAutoCommit(Unknown Source) ~[na:na] 
at org.hibernate.resource.jdbc.internal.AbstractLogicalConnectionImplementor.begin(AbstractLogicalConnectionImplementor.java:67) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final] 
at org.hibernate.resource.jdbc.internal.LogicalConnectionManagedImpl.begin(LogicalConnectionManagedImpl.java:238) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final] 
at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl$TransactionDriverControlImpl.begin(JdbcResourceLocalTransactionCoordinatorImpl.java:214) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final] 
at org.hibernate.engine.transaction.internal.TransactionImpl.begin(TransactionImpl.java:52) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final] 
at org.hibernate.internal.SessionImpl.beginTransaction(SessionImpl.java:1512) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final] 
at org.hibernate.jpa.internal.TransactionImpl.begin(TransactionImpl.java:45) ~[hibernate-entitymanager-5.0.12.Final.jar:5.0.12.Final] 
at org.swecunet.portal.PortalJPADatabase.save(PortalJPADatabase.java:92) ~[classes/:na] 
at org.swecunet.portal.pwmgr.PWMController.passwordGet(PWMController.java:152) ~[classes/:na] 
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_144] 
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_144] 
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_144] 
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_144] 
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205) ~[spring-web-4.3.9.RELEASE.jar:4.3.9.RELEASE] 
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:133) ~[spring-web-4.3.9.RELEASE.jar:4.3.9.RELEASE] 
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:97) ~[spring-webmvc-4.3.9.RELEASE.jar:4.3.9.RELEASE] 
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827) ~[spring-webmvc-4.3.9.RELEASE.jar:4.3.9.RELEASE] 
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738) ~[spring-webmvc-4.3.9.RELEASE.jar:4.3.9.RELEASE] 
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85) ~[spring-webmvc-4.3.9.RELEASE.jar:4.3.9.RELEASE] 
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:967) ~[spring-webmvc-4.3.9.RELEASE.jar:4.3.9.RELEASE] 
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:901) ~[spring-webmvc-4.3.9.RELEASE.jar:4.3.9.RELEASE] 
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970) ~[spring-webmvc-4.3.9.RELEASE.jar:4.3.9.RELEASE] 
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861) ~[spring-webmvc-4.3.9.RELEASE.jar:4.3.9.RELEASE] 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:635) ~[tomcat-embed-core-8.5.15.jar:8.5.15] 
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846) ~[spring-webmvc-4.3.9.RELEASE.jar:4.3.9.RELEASE] 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:742) ~[tomcat-embed-core-8.5.15.jar:8.5.15] 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-8.5.15.jar:8.5.15] 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.15.jar:8.5.15] 
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) ~[tomcat-embed-websocket-8.5.15.jar:8.5.15] 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.15.jar:8.5.15] 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.15.jar:8.5.15] 
at org.springframework.security.kerberos.web.authentication.SpnegoAuthenticationProcessingFilter.doFilter(SpnegoAuthenticationProcessingFilter.java:128) ~[spring-security-kerberos-web-1.0.1.RELEASE.jar:1.0.1.RELEASE] 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.15.jar:8.5.15] 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.15.jar:8.5.15] 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:317) ~[spring-security-web-4.1.4.RELEASE.jar:4.1.4.RELEASE] 
at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:127) ~[spring-security-web-4.1.4.RELEASE.jar:4.1.4.RELEASE] 
at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:91) ~[spring-security-web-4.1.4.RELEASE.jar:4.1.4.RELEASE] 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) ~[spring-security-web-4.1.4.RELEASE.jar:4.1.4.RELEASE] 
at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:115) ~[spring-security-web-4.1.4.RELEASE.jar:4.1.4.RELEASE] 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) ~[spring-security-web-4.1.4.RELEASE.jar:4.1.4.RELEASE] 
at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:137) ~[spring-security-web-4.1.4.RELEASE.jar:4.1.4.RELEASE] 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) ~[spring-security-web-4.1.4.RELEASE.jar:4.1.4.RELEASE] 
at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:111) ~[spring-security-web-4.1.4.RELEASE.jar:4.1.4.RELEASE] 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) ~[spring-security-web-4.1.4.RELEASE.jar:4.1.4.RELEASE] 
at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:169) ~[spring-security-web-4.1.4.RELEASE.jar:4.1.4.RELEASE] 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) ~[spring-security-web-4.1.4.RELEASE.jar:4.1.4.RELEASE] 
at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63) ~[spring-security-web-4.1.4.RELEASE.jar:4.1.4.RELEASE] 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) ~[spring-security-web-4.1.4.RELEASE.jar:4.1.4.RELEASE] 
at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:200) ~[spring-security-web-4.1.4.RELEASE.jar:4.1.4.RELEASE] 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) ~[spring-security-web-4.1.4.RELEASE.jar:4.1.4.RELEASE] 
at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:121) ~[spring-security-web-4.1.4.RELEASE.jar:4.1.4.RELEASE] 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) ~[spring-security-web-4.1.4.RELEASE.jar:4.1.4.RELEASE] 
at org.springframework.security.web.csrf.CsrfFilter.doFilterInternal(CsrfFilter.java:100) ~[spring-security-web-4.1.4.RELEASE.jar:4.1.4.RELEASE] 
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.9.RELEASE.jar:4.3.9.RELEASE] 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) ~[spring-security-web-4.1.4.RELEASE.jar:4.1.4.RELEASE] 
at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:66) ~[spring-security-web-4.1.4.RELEASE.jar:4.1.4.RELEASE] 
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.9.RELEASE.jar:4.3.9.RELEASE] 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) ~[spring-security-web-4.1.4.RELEASE.jar:4.1.4.RELEASE] 
at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:105) ~[spring-security-web-4.1.4.RELEASE.jar:4.1.4.RELEASE] 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) ~[spring-security-web-4.1.4.RELEASE.jar:4.1.4.RELEASE] 
at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:56) ~[spring-security-web-4.1.4.RELEASE.jar:4.1.4.RELEASE] 
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.9.RELEASE.jar:4.3.9.RELEASE] 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) ~[spring-security-web-4.1.4.RELEASE.jar:4.1.4.RELEASE] 
at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:214) ~[spring-security-web-4.1.4.RELEASE.jar:4.1.4.RELEASE] 
at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:177) ~[spring-security-web-4.1.4.RELEASE.jar:4.1.4.RELEASE] 
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346) ~[spring-web-4.3.9.RELEASE.jar:4.3.9.RELEASE] 
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:262) ~[spring-web-4.3.9.RELEASE.jar:4.3.9.RELEASE] 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.15.jar:8.5.15] 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.15.jar:8.5.15] 
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) ~[spring-web-4.3.9.RELEASE.jar:4.3.9.RELEASE] 
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.9.RELEASE.jar:4.3.9.RELEASE] 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.15.jar:8.5.15] 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.15.jar:8.5.15] 
at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:105) ~[spring-web-4.3.9.RELEASE.jar:4.3.9.RELEASE] 
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.9.RELEASE.jar:4.3.9.RELEASE] 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.15.jar:8.5.15] 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.15.jar:8.5.15] 
at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:81) ~[spring-web-4.3.9.RELEASE.jar:4.3.9.RELEASE] 
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.9.RELEASE.jar:4.3.9.RELEASE] 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.15.jar:8.5.15] 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.15.jar:8.5.15] 
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197) ~[spring-web-4.3.9.RELEASE.jar:4.3.9.RELEASE] 
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.9.RELEASE.jar:4.3.9.RELEASE] 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.15.jar:8.5.15] 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.15.jar:8.5.15] 
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198) ~[tomcat-embed-core-8.5.15.jar:8.5.15] 
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat-embed-core-8.5.15.jar:8.5.15] 
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:478) [tomcat-embed-core-8.5.15.jar:8.5.15] 
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) [tomcat-embed-core-8.5.15.jar:8.5.15] 
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:80) [tomcat-embed-core-8.5.15.jar:8.5.15] 
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) [tomcat-embed-core-8.5.15.jar:8.5.15] 
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342) [tomcat-embed-core-8.5.15.jar:8.5.15] 
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:799) [tomcat-embed-core-8.5.15.jar:8.5.15] 
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) [tomcat-embed-core-8.5.15.jar:8.5.15] 
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:861) [tomcat-embed-core-8.5.15.jar:8.5.15] 
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1455) [tomcat-embed-core-8.5.15.jar:8.5.15] 
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-8.5.15.jar:8.5.15] 
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_144] 
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_144] 
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-8.5.15.jar:8.5.15] 
at java.lang.Thread.run(Thread.java:748) [na:1.8.0_144]

編集 - 私たちのJPAの接続クラスで定義されて持続性の設定：

private EntityManager _entityManager; 
/** 
* gets the JPA entity manager associated with this database connection 
* @return 
*/ 
public EntityManager getEntityManager() { 
    if(_entityManager==null) { 
     _entityManager=getEntityManagerFactory().createEntityManager(); 
    } 
    return _entityManager; 

} 

/** 
* Save an entity into this database 
* @param entityObjectToSave the @Entity jpa object within the model package namespace 
*/ 
public void save(Object entityObjectToSave) { 
    getEntityManager().getTransaction().begin(); 
    getEntityManager().persist(entityObjectToSave); 
    getEntityManager().getTransaction().commit();  
} 

/** 
* Delete an entity from this database 
* @param entityObjectToDelete the @Entity jpa object within the model package namespace 
*/ 
public void remove(Object entityObjectToDelete) { 
    getEntityManager().getTransaction().begin(); 
    getEntityManager().remove(entityObjectToDelete); 
    getEntityManager().getTransaction().commit();  
} 

private EntityManagerFactory _entityManagerFactory; 

public EntityManagerFactory getEntityManagerFactory() { 
    if(_entityManagerFactory==null) { 

     final LocalContainerEntityManagerFactoryBean emf = new LocalContainerEntityManagerFactoryBean(); 
     emf.setDataSource(getDataSource()); 
     emf.setPersistenceUnitName(_dbSchema); 
     _log.info(String.format("Scanning %s for entity models...", _dbJPAPackageLocation)); 
     emf.setPackagesToScan(_dbJPAPackageLocation);  
     HibernateJpaVendorAdapter hjpa=new HibernateJpaVendorAdapter(); 
     hjpa.setShowSql(_dbJPAShowSQL); 
     emf.setJpaVendorAdapter(hjpa); 
     Properties properties = new Properties();   
     properties.setProperty("spring.jpa.hibernate.ddl-auto", "update"); 
     properties.setProperty("hibernate.dialect", "org.hibernate.dialect.MySQL5Dialect"); 
     emf.setJpaProperties(properties);   
     emf.setPersistenceProviderClass(HibernatePersistenceProvider.class); 
     emf.afterPropertiesSet(); 
     _entityManagerFactory=emf.getObject(); 
    } 
    return _entityManagerFactory; 
}

出典

2017-11-16 Sheldon

Hibernateはのための接続を維持するとのバグがあります長期間、C3P0が修正されます。私たちは、実際に私たちは豆を作成するJavaクラス内のすべてを定義している、にpersistence.xmlを使用していない、あなたのpersistence.xmlに

 <property name="hibernate.connection.provider_class" 
     value="org.hibernate.connection.C3P0ConnectionProvider" /> 

    <property name="hibernate.c3p0.max_size" value="5" /> 
    <property name="hibernate.c3p0.min_size" value="0" /> 
    <property name="hibernate.c3p0.acquire_increment" value="1" /> 
    <property name="hibernate.c3p0.idle_test_period" value="300"/> 
    <property name="hibernate.c3p0.max_statements" value="0" /> 
    <property name="hibernate.c3p0.timeout" value="60" /> 
    <property name="hibernate.connection.zeroDateTimeBehavior" value="convertToNull"></property>

出典

2017-11-17 06:07:00 brt

をこれらの追加

してみてください。パーシスタンス設定がOPに追加されました。 – Sheldon

Hibernateがタイムアウトしている可能性があります。また、接続を維持するために依存関係としてc3p0が必要です。 – brt

接続が閉じられている場合、Springクライアントはプールから接続を取得する必要があります

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