Spring 正在失去与数据库的连接，并且无法恢复或重新连接

Spring is losing connection to the DB and does not recover or reconnect

提问by Vadimo

I have a spring-boot application on the same host as the Maria DB and both are running fine for some time. But between 12 hours and 2 days it seems that the spring boot application looses the connection to the database (stacktrace) and does not recover from that.

我在与 Maria DB 相同的主机上有一个 spring-boot 应用程序，并且两者都运行了一段时间。但是在 12 小时到 2 天之间，spring boot 应用程序似乎失去了与数据库的连接（堆栈跟踪）并且无法从中恢复。

When I restart the spring application all is fine again for some time.

当我重新启动 spring 应用程序一段时间后，一切又好了。

The application is not under load and when it looses the connection the application is still working but the db connection does not recover. The DB did not restart in the meantime (uptime 4 weeks). Only the monitoring service pings the application which pings the DB once a minute. (spring boot health)

应用程序没有负载，当它断开连接时，应用程序仍在工作，但数据库连接没有恢复。数据库在此期间没有重新启动（正常运行时间为 4 周）。只有监控服务 ping 应用程序，该应用程序每分钟 ping 一次数据库。（弹簧靴健康）

Other Java applications that are connected to the same DB are running fine and do not have any issues.

连接到同一数据库的其他 Java 应用程序运行良好，没有任何问题。

My Question is:

我的问题是：

Why does spring not recover from that error and try to reconnect to the DB again? How can I set up spring to reconnect to the DB?

为什么 spring 无法从该错误中恢复并再次尝试重新连接到数据库？如何设置 spring 以重新连接到数据库？

2015-02-19 15:25:48.392  INFO 4931 [qtp92662861-19] --- o.s.b.f.xml.XmlBeanDefinitionReader      : Loading XML bean definitions from class path resource [org/springframework/jdbc/support/sql-error-codes.xml]
2015-02-19 15:25:48.580  INFO 4931 [qtp92662861-19] --- o.s.jdbc.support.SQLErrorCodesFactory    : SQLErrorCodes loaded: [DB2, Derby, H2, HSQL, Informix, MS-SQL, MySQL, Oracle, PostgreSQL, Sybase]
2015-02-19 15:25:48.616  WARN 4931 [qtp92662861-19] --- o.s.jdbc.support.SQLErrorCodesFactory    : Error while extracting database product name - falling back to empty error codes

org.springframework.jdbc.support.MetaDataAccessException: Error while extracting DatabaseMetaData; nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: No operations allowed after connection closed.
    at org.springframework.jdbc.support.JdbcUtils.extractDatabaseMetaData(JdbcUtils.java:296)
    at org.springframework.jdbc.support.JdbcUtils.extractDatabaseMetaData(JdbcUtils.java:320)
    at org.springframework.jdbc.support.SQLErrorCodesFactory.getErrorCodes(SQLErrorCodesFactory.java:214)
    at org.springframework.jdbc.support.SQLErrorCodeSQLExceptionTranslator.setDataSource(SQLErrorCodeSQLExceptionTranslator.java:134)
    at org.springframework.jdbc.support.SQLErrorCodeSQLExceptionTranslator.<init>(SQLErrorCodeSQLExceptionTranslator.java:97)
    at org.springframework.jdbc.support.JdbcAccessor.getExceptionTranslator(JdbcAccessor.java:99)
    at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:413)
    at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:468)
    at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:478)
    at org.springframework.boot.actuate.health.DataSourceHealthIndicator.doDataSourceHealthCheck(DataSourceHealthIndicator.java:98)
    at org.springframework.boot.actuate.health.DataSourceHealthIndicator.doHealthCheck(DataSourceHealthIndicator.java:87)
    at org.springframework.boot.actuate.health.AbstractHealthIndicator.health(AbstractHealthIndicator.java:38)
    at org.springframework.boot.actuate.endpoint.HealthEndpoint.invoke(HealthEndpoint.java:67)
    at org.springframework.boot.actuate.endpoint.HealthEndpoint.invoke(HealthEndpoint.java:34)
    at org.springframework.boot.actuate.endpoint.mvc.HealthMvcEndpoint.invoke(HealthMvcEndpoint.java:102)
    at sun.reflect.GeneratedMethodAccessor78.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:483)
    at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:215)
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:749)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:689)
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:83)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:938)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:870)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:961)
    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:852)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:687)
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
    at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:769)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1667)
    at org.springframework.boot.actuate.trace.WebRequestTraceFilter.doFilterInternal(WebRequestTraceFilter.java:110)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1650)
    at org.springframework.boot.actuate.autoconfigure.EndpointWebMvcAutoConfiguration$ApplicationContextHeaderFilter.doFilterInternal(EndpointWebMvcAutoConfiguration.java:280)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1650)
    at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:186)
    at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:160)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1650)
    at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1650)
    at onlinevalidation.CorsFilter.doFilter(CorsFilter.java:20)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1650)
    at org.springframework.boot.actuate.autoconfigure.MetricFilterAutoConfiguration$MetricsFilter.doFilterInternal(MetricFilterAutoConfiguration.java:90)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1650)
    at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:583)
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
    at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:577)
    at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223)
    at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1125)
    at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515)
    at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
    at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1059)
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
    at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
    at org.eclipse.jetty.server.Server.handle(Server.java:497)
    at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:311)
    at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:248)
    at org.eclipse.jetty.io.AbstractConnection.run(AbstractConnection.java:540)
    at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:610)
    at org.eclipse.jetty.util.thread.QueuedThreadPool.run(QueuedThreadPool.java:539)
    at java.lang.Thread.run(Thread.java:745)
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: No operations allowed after connection closed.
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:408)
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:377)
    at com.mysql.jdbc.Util.getInstance(Util.java:360)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:956)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:935)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:924)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:870)
    at com.mysql.jdbc.ConnectionImpl.throwConnectionClosedException(ConnectionImpl.java:1232)
    at com.mysql.jdbc.ConnectionImpl.checkClosed(ConnectionImpl.java:1225)
    at com.mysql.jdbc.ConnectionImpl.getMetaData(ConnectionImpl.java:2932)
    at com.mysql.jdbc.ConnectionImpl.getMetaData(ConnectionImpl.java:2927)
    at sun.reflect.GeneratedMethodAccessor76.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:483)
    at org.apache.tomcat.jdbc.pool.ProxyConnection.invoke(ProxyConnection.java:126)
    at org.apache.tomcat.jdbc.pool.JdbcInterceptor.invoke(JdbcInterceptor.java:109)
    at org.apache.tomcat.jdbc.pool.DisposableConnectionFacade.invoke(DisposableConnectionFacade.java:80)
    at com.sun.proxy.$Proxy68.getMetaData(Unknown Source)
    at org.springframework.jdbc.support.JdbcUtils.extractDatabaseMetaData(JdbcUtils.java:285)
    ... 66 common frames omitted
Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

The last packet successfully received from the server was 758,805 milliseconds ago.  The last packet sent successfully to the server was 37 milliseconds ago.
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:408)
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:377)
    at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1036)
    at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3427)
    at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3327)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3814)
    at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2435)
    at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2582)
    at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2526)
    at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2484)
    at com.mysql.jdbc.StatementImpl.executeQuery(StatementImpl.java:1446)
    at org.springframework.jdbc.core.JdbcTemplateQueryStatementCallback.doInStatement(JdbcTemplate.java:452)
    at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:402)
    ... 60 common frames omitted
Caused by: java.io.EOFException: Can not read response from server. Expected to read 4 bytes, read 0 bytes before connection was unexpectedly lost.
    at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:2914)
    at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3337)
    ... 69 common frames omitted

@Configuration
@ComponentScan(value = "com.demo.validation",scopedProxy = TARGET_CLASS)
@EnableAutoConfiguration
@EnableAspectJAutoProxy(proxyTargetClass = true)
@EnableCaching(proxyTargetClass = true)
@EnableAsync(proxyTargetClass = true)
@EnableJpaRepositories
@EnableTransactionManagement(proxyTargetClass = true)
public class Configuration {
  main(...)
}

The Configuration

配置

spring.datasource.url=jdbc:mysql://localhost/validation
spring.datasource.username=validation
spring.datasource.password=****
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

Gradle.Build

摇篮构建

dependencies {
    //Boot
    compile 'org.codehaus.groovy:groovy-all:2.3.7:indy'
    compile 'org.springframework.boot:spring-boot-starter-actuator:1.1.8.RELEASE'
    compile 'org.springframework.boot:spring-boot-starter-security:1.1.8.RELEASE'
    compile 'org.springframework:spring-aspects:4.0.7.RELEASE'
    compile 'org.springframework.boot:spring-boot-starter-aop:1.1.8.RELEASE'
    compile 'org.springframework:spring-instrument:4.0.7.RELEASE'
    compile('org.springframework.boot:spring-boot-starter-web:1.1.8.RELEASE'){
        exclude module: 'spring-boot-starter-tomcat'
    }

    //servlet container
    compile 'org.eclipse.jetty:jetty-webapp:9.2.3.v20140905'
    compile 'org.eclipse.jetty:jetty-servlets:9.2.3.v20140905'

    //DB
    compile 'org.springframework.boot:spring-boot-starter-data-jpa:1.1.8.RELEASE'
    compile 'mysql:mysql-connector-java:5.1.34'
    //compile 'org.mariadb.jdbc:mariadb-java-client:1.1.8'
    runtime 'com.h2database:h2:1.4.182'

采纳答案by Hazok

Per a senior member in the Spring forums, the Spring DataSource is not intended for production use:

根据Spring 论坛的高级成员的说法，Spring DataSource 不适用于生产用途：

The above answers are only part of the solution. Indeed you need proper transaction managent AND you need a connection pool. The DriverManagerDataSource is NOT meant for production, it opens and closes a datebase connection each time it needs one.

以上答案只是解决方案的一部分。实际上，您需要适当的事务管理并且需要一个连接池。DriverManagerDataSource 不是用于生产，它在每次需要时打开和关闭一个数据库连接。

Instead you can use C3P0 as your DataSource which handles the reconnect and is much better in performance. Here's a quick example of a potential configuration in a Spring xml configuration:

相反，您可以使用 C3P0 作为处理重新连接的数据源，并且性能要好得多。这是 Spring xml 配置中潜在配置的快速示例：

<bean id="c3p0DataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"
    destroy-method="close">
    <property name="driverClass" value="com.mysql.jdbc.Driver" />
    <property name="jdbcUrl" value="#{systemProperties.dbhost}" />
    <property name="user" value="#{systemProperties.dbuser}" />
    <property name="password" value="#{systemProperties.dbpass}" />
    <property name="maxPoolSize" value="25" />
    <property name="minPoolSize" value="10" />
    <property name="maxStatements" value="100" />
    <property name="testConnectionOnCheckout" value="true" />
</bean>
<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
    <constructor-arg ref="c3p0DataSource" />
</bean>

回答by user5101998

Spring (3) boot settings for hibernate and oracle:

Spring(3)hibernate和oracle的启动设置：

spring.datasource.test-on-borrow=true

spring.datasource.test-on-borrow=true

spring.datasource.validation-query=select 1 from dual

spring.datasource.validation-query=从双中选择 1

---

---

回答by Fritz Duchardt

Try changing your connection URL to:

尝试将您的连接 URL 更改为：

spring.datasource.url=jdbc:mysql://localhost/validation?autoReconnect=true