Spring-Retry 没有从 HikariCP 获得新的数据库连接
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【中文标题】Spring-Retry 没有从 HikariCP 获得新的数据库连接【英文标题】：Spring-Retry doesn't get a new database connection from HikariCP 【发布时间】：2021-03-23 03:40:54 【问题描述】：我知道 spring-retry 不会抓取数据库连接。
我们使用 @Retryable 包装了一个 REST 端点，以尝试执行重试功能，但它并没有按预期工作。我曾预料到，当由于com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure 而引发 SQLException 时，下一次尝试将从池中获取新连接。我面临一个问题，如果我们在处理过程中部分关闭 MySQL 数据库，spring-retry 会重试方法调用，但不会获得新的数据库连接。结果，所有重试都失败，但对 REST 端点的新请求成功。有没有办法可以强制从数据源建立新连接？
我知道 Spring-retry 对正在运行的代码一无所知，但我很困惑为什么刚刚抛出异常的连接没有被丢弃，并且在给定数据源配置的情况下从池中拉出一个新连接。 （它是一个简单的 Spring 数据源）
我很欣赏 Spring-retry 和 HikariCP 是独立的东西，但我曾设想如果数据库由于某种原因失败，Spring-retry 将允许我们重新尝试相同的处理？
版本
Mysql connector version: 8.0.18
HikariCP version: 3.4.5
SpringBoot version: 2.1.9.RELEASE
application.yml
spring:
main:
allow-bean-definition-overriding: true
jpa:
database-platform: org.hibernate.dialect.MySQL5Dialect
hibernate:
use-new-id-generator-mappings: false
boot:
admin:
url: http://127.0.0.1:8022
username: admin
password: *****
client:
name: $spring.application.name
application:
name: Usage Aggregation
datasource:
type: com.zaxxer.hikari.HikariDataSource
url: jdbc:mysql://localhost:3308/db?createDatabaseIfNotExist=false&autoReconnect=true&autoReconnectForPools=true&socketTimeout=5000&connectTimeout=1000&useSSL=false
hikari:
jdbcUrl: jdbc:mysql://localhost:3308/db?createDatabaseIfNotExist=false&autoReconnect=true&autoReconnectForPools=true&socketTimeout=5000&connectTimeout=1000&useSSL=false
username: root
password: ****
register-mbeans: true
connectionInitSql: SELECT 1 FROM DUAL
connectionTestQuery: SELECT 1 FROM DUAL
socketTimeout: 3000
validationTimeout: 500
maximumPoolSize: 5
idleTimeout: 3000
poolName: SpringBootJPAHikariCP
maxLifetime: 60000
connectionTimeout: 1000
控制器
@Retryable(exclude = IllegalStateException.class,
maxAttemptsExpression = 3,
backoff = @Backoff(
delayExpression = 30000,
maxDelayExpression = 2,
multiplierExpression = 500000
))
@RequestMapping("usageData/load/")
public void usageDataFromSource()
log.info("Running usage data live service end point for: usageData");
//Sets status of aggregation disabled to false.
aggregationService.updateAggregationDisabledFlag("usageData", false);
usageService.copyUsageDataFromSourceToDestination();
日志：
[2020-12-11 16:03:00,933] [http-nio-8095-exec-1] INFO u.b.c.RestController [] - Running usage data live service end point for: usageData
[2020-12-11 16:03:09,099] [http-nio-8095-exec-1] DEBUG o.s.retry.support.RetryTemplate [] - Retry: count=0
[2020-12-11 16:03:09,099] [http-nio-8095-exec-1] INFO u.b.config.RetryableDataSource [] - ***************************** Getting a new Database connection *****************************
[2020-12-11 16:03:09,811] [http-nio-8095-exec-1] INFO u.b.service.UsageDataServiceImpl [] - aggregation switch is false
[2020-12-11 16:03:19,906] [http-nio-8095-exec-1] ERROR u.b.service.UsageDataServiceImpl [] - No usage data file available to process. Setting aggregationDisabled flag to true.
此时数据库已经查询了一个标志的状态，表明数据库连接正在工作。数据库此时停止，以模拟数据库故障，以测试失败/重试/恢复场景。
[2020-12-11 16:03:19,929] [http-nio-8095-exec-1] WARN c.zaxxer.hikari.pool.ProxyConnection [] - SpringBootJPAHikariCP - Connection com.mysql.cj.jdbc.ConnectionImpl@184c1740 marked as broken because of SQLSTATE(08S01), ErrorCode(0)
com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure
The last packet successfully received from the server was 10,738 milliseconds ago. The last packet sent successfully to the server was 10,738 milliseconds ago.
at com.mysql.cj.jdbc.exceptions.SQLError.createCommunicationsException(SQLError.java:174)
at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:64)
at com.mysql.cj.jdbc.ConnectionImpl.setAutoCommit(ConnectionImpl.java:2056)
at com.zaxxer.hikari.pool.ProxyConnection.setAutoCommit(ProxyConnection.java:414)
at com.zaxxer.hikari.pool.HikariProxyConnection.setAutoCommit(HikariProxyConnection.java)
at org.hibernate.resource.jdbc.internal.AbstractLogicalConnectionImplementor.begin(AbstractLogicalConnectionImplementor.java:67)
at org.hibernate.resource.jdbc.internal.LogicalConnectionManagedImpl.begin(LogicalConnectionManagedImpl.java:263)
at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl$TransactionDriverControlImpl.begin(JdbcResourceLocalTransactionCoordinatorImpl.java:236)
at org.hibernate.engine.transaction.internal.TransactionImpl.begin(TransactionImpl.java:86)
at org.springframework.orm.jpa.vendor.HibernateJpaDialect.beginTransaction(HibernateJpaDialect.java:184)
at org.springframework.orm.jpa.JpaTransactionManager.doBegin(JpaTransactionManager.java:402)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:378)
at org.springframework.transaction.interceptor.TransactionAspectSupport.createTransactionIfNecessary(TransactionAspectSupport.java:475)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:289)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:98)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:139)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor$CrudMethodMetadataPopulatingMethodInterceptor.invoke(CrudMethodMetadataPostProcessor.java:144)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor$ExposeRepositoryInvocationInterceptor.invoke(CrudMethodMetadataPostProcessor.java:364)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:93)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.data.repository.core.support.SurroundingTransactionDetectorMethodInterceptor.invoke(SurroundingTransactionDetectorMethodInterceptor.java:61)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212)
at com.sun.proxy.$Proxy133.updateAggregationDisabledFlag(Unknown Source)
at uk.bobbins.service.AggregationServiceImpl.updateAggregationDisabledFlag(AggregationServiceImpl.java:457)
at uk.bobbins.service.UsageDataServiceImpl.copyUsageDataFromSourceToDestination(UsageDataServiceImpl.java:94)
at uk.bobbins.UsageServiceImpl.copyUsageDataFromSourceToDestination(UsageServiceImpl.java:94)
at uk.bobbins.controller.RestController.UsageDataFromSource(RestController.java:152)
at uk.bobbins.controller.RestController$$FastClassBySpringCGLIB$$ae255ac.invoke(<generated>)
at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)
...
...
at java.lang.Thread.run(Thread.java:748)
Caused by: com.mysql.cj.exceptions.CJCommunicationsException: Communications link failure
The last packet successfully received from the server was 10,738 milliseconds ago. The last packet sent successfully to the server was 10,738 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:423)
at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:61)
at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:105)
at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:151)
at com.mysql.cj.exceptions.ExceptionFactory.createCommunicationsException(ExceptionFactory.java:167)
at com.mysql.cj.protocol.a.NativeProtocol.readMessage(NativeProtocol.java:539)
at com.mysql.cj.protocol.a.NativeProtocol.checkErrorMessage(NativeProtocol.java:703)
at com.mysql.cj.protocol.a.NativeProtocol.sendCommand(NativeProtocol.java:642)
at com.mysql.cj.protocol.a.NativeProtocol.sendQueryPacket(NativeProtocol.java:941)
at com.mysql.cj.protocol.a.NativeProtocol.sendQueryString(NativeProtocol.java:887)
at com.mysql.cj.NativeSession.execSQL(NativeSession.java:1073)
at com.mysql.cj.jdbc.ConnectionImpl.setAutoCommit(ConnectionImpl.java:2046)
... 104 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.cj.protocol.FullReadInputStream.readFully(FullReadInputStream.java:67)
at com.mysql.cj.protocol.a.SimplePacketReader.readHeader(SimplePacketReader.java:63)
at com.mysql.cj.protocol.a.SimplePacketReader.readHeader(SimplePacketReader.java:45)
at com.mysql.cj.protocol.a.TimeTrackingPacketReader.readHeader(TimeTrackingPacketReader.java:52)
at com.mysql.cj.protocol.a.TimeTrackingPacketReader.readHeader(TimeTrackingPacketReader.java:41)
at com.mysql.cj.protocol.a.MultiPacketReader.readHeader(MultiPacketReader.java:54)
at com.mysql.cj.protocol.a.MultiPacketReader.readHeader(MultiPacketReader.java:44)
at com.mysql.cj.protocol.a.NativeProtocol.readMessage(NativeProtocol.java:533)
... 110 common frames omitted
[2020-12-11 16:03:19,947] [http-nio-8095-exec-1] DEBUG o.s.r.b.ExponentialBackOffPolicy [] - Sleeping for 30000
此时数据库重新启动。我们希望 Spring-retry 会抓住一个新的连接并继续。不是这种情况。而是使用相同的死连接进行后续重试，并且该过程相应地失败。
[2020-12-11 16:03:49,948] [http-nio-8095-exec-1] DEBUG o.s.retry.support.RetryTemplate [] - Checking for rethrow: count=1
[2020-12-11 16:03:49,948] [http-nio-8095-exec-1] DEBUG o.s.retry.support.RetryTemplate [] - Retry: count=1
[2020-12-11 16:03:49,948] [http-nio-8095-exec-1] INFO u.b.c.RestController [] - Running usage data live service end point for: usageData
[2020-12-11 16:03:53,752] [http-nio-8095-exec-1] DEBUG o.s.r.b.ExponentialBackOffPolicy [] - Sleeping for 60000
[2020-12-11 16:04:53,753] [http-nio-8095-exec-1] DEBUG o.s.retry.support.RetryTemplate [] - Checking for rethrow: count=2
[2020-12-11 16:04:53,753] [http-nio-8095-exec-1] DEBUG o.s.retry.support.RetryTemplate [] - Retry: count=2
[2020-12-11 16:04:53,753] [http-nio-8095-exec-1] INFO u.b.c.RestController [] - Running usage data live service end point for: usageData
[2020-12-11 16:06:53,609] [SpringBootJPAHikariCP housekeeper] WARN com.zaxxer.hikari.pool.HikariPool [] - SpringBootJPAHikariCP - Thread starvation or clock leap detected (housekeeper delta=2m3s700ms974µs274ns).
[2020-12-11 16:06:53,608] [http-nio-8095-exec-1] DEBUG o.s.retry.support.RetryTemplate [] - Checking for rethrow: count=3
[2020-12-11 16:06:53,612] [http-nio-8095-exec-1] DEBUG o.s.retry.support.RetryTemplate [] - Retry failed last attempt: count=3
[2020-12-11 16:06:53,640] [http-nio-8095-exec-1] ERROR o.a.c.c.C.[.[.[.[dispatcherServlet] [] - Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.transaction.CannotCreateTransactionException: Could not open JPA EntityManager for transaction; nested exception is org.hibernate.TransactionException: JDBC begin transaction failed: ] with root cause
java.sql.SQLException: Connection is closed
at com.zaxxer.hikari.pool.ProxyConnection$ClosedConnection.lambda$getClosedConnection$0(ProxyConnection.java:515)
at com.sun.proxy.$Proxy98.setAutoCommit(Unknown Source)
at com.zaxxer.hikari.pool.ProxyConnection.setAutoCommit(ProxyConnection.java:414)
at com.zaxxer.hikari.pool.HikariProxyConnection.setAutoCommit(HikariProxyConnection.java)
at org.hibernate.resource.jdbc.internal.AbstractLogicalConnectionImplementor.begin(AbstractLogicalConnectionImplementor.java:67)
at org.hibernate.resource.jdbc.internal.LogicalConnectionManagedImpl.begin(LogicalConnectionManagedImpl.java:263)
at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl$TransactionDriverControlImpl.begin(JdbcResourceLocalTransactionCoordinatorImpl.java:236)
at org.hibernate.engine.transaction.internal.TransactionImpl.begin(TransactionImpl.java:86)
at org.springframework.orm.jpa.vendor.HibernateJpaDialect.beginTransaction(HibernateJpaDialect.java:184)
at org.springframework.orm.jpa.JpaTransactionManager.doBegin(JpaTransactionManager.java:402)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:378)
at org.springframework.transaction.interceptor.TransactionAspectSupport.createTransactionIfNecessary(TransactionAspectSupport.java:475)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:289)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:98)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:139)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor$CrudMethodMetadataPopulatingMethodInterceptor.invoke(CrudMethodMetadataPostProcessor.java:144)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor$ExposeRepositoryInvocationInterceptor.invoke(CrudMethodMetadataPostProcessor.java:364)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:93)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.data.repository.core.support.SurroundingTransactionDetectorMethodInterceptor.invoke(SurroundingTransactionDetectorMethodInterceptor.java:61)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212)
at com.sun.proxy.$Proxy133.updateAggregationDisabledFlag(Unknown Source)
at uk.bobbins.service.AggregationServiceImpl.updateAggregationDisabledFlag(AggregationServiceImpl.java:457)
at uk.bobbins.controller.RestController.usageDataFromSource(RestController.java:149)
at uk.bobbins.controller.RestController$$FastClassBySpringCGLIB$$ae255ac.invoke(<generated>)
at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:750)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
at org.springframework.retry.interceptor.RetryOperationsInterceptor$1.doWithRetry(RetryOperationsInterceptor.java:91)
at org.springframework.retry.support.RetryTemplate.doExecute(RetryTemplate.java:287)
at org.springframework.retry.support.RetryTemplate.execute(RetryTemplate.java:164)
at org.springframework.retry.interceptor.RetryOperationsInterceptor.invoke(RetryOperationsInterceptor.java:118)
at org.springframework.retry.annotation.AnnotationAwareRetryOperationsInterceptor.invoke(AnnotationAwareRetryOperationsInterceptor.java:153)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:689)
at uk.bobbins.controller.RestController$$EnhancerBySpringCGLIB$$574fc03d.usageDataFromSource(<generated>)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:105)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:893)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:798)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:634)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.boot.actuate.web.trace.servlet.HttpTraceFilter.doFilterInternal(HttpTraceFilter.java:88)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:94)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.filterAndRecordMetrics(WebMvcMetricsFilter.java:114)
at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java:104)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:526)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:860)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1589)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
如果有人能阐明我如何使 spring-retry 功能获取新的数据库连接（甚至从池中），我将不胜感激。
为了更清晰而进行了编辑。
【问题讨论】：
>retry would grab a new connection from the pool. Spring Retry 对正在重试的代码甚至正在使用的连接一无所知。获得连接完全超出了重试的范围。对我来说，新的 REST 请求有效，但重试无效。也许这是一个时间问题。我会在调试器中运行它，看看发生了什么。
我知道重试对正在运行的代码一无所知，我想它只是该方法的一个包装器。我只能说明通过代码进行调试后似乎正在发生的事情。我只是想找出当前连接已死时代码未从池中获取新连接的原因。
看起来线程以某种方式保持着数据库连接。
【参考方案1】：
好的，经过一番摸索，我终于想我已经设法弄清楚发生了什么。似乎在数据库连接失败时，抛出异常并向上报告，但 Spring 重试阻止了某些事情的发生，并且在随后通过代码重试时未获取新的数据库连接。
我能找到的唯一解决方案是用我自己的 @Retry 注释和处理注释的方面替换 Spring-Retry。
也就是说：
@Retry
@RequestMapping("usageData/load/")
public void usageDataFromSource()
log.info("Running usage data live service end point for: usageData");
//Sets status of aggregation disabled to false.
aggregationService.updateAggregationDisabledFlag("usageData", false);
usageService.copyUsageDataFromSourceToDestination();
还有注解：
@Documented
@Target(ElementType.METHOD)
@Inherited
@Retention(RetentionPolicy.RUNTIME)
public @interface Retry
int initialDelay() default 30000;
int multiplier() default 2;
int maxInterval() default 500000;
还有方面：
@Around(value = "@annotation(retry)")
public Object performMethodCallWithRetry(ProceedingJoinPoint joinPoint, Retry retry) throws Throwable
log.debug("About to try checking the Connection");
int initialDelay = retry.initialDelay();
int multiplier = retry.multiplier();
int maxInterval = retry.maxInterval();
int count = 0;
long startTime = System.currentTimeMillis();
int delay = 0;
Object object = null;
Throwable throwable;
do
try
// Create the future call and wait for the response
object = CompletableFuture.supplyAsync(() ->
try
return joinPoint.proceed();
catch (Throwable e)
throw new IllegalStateException(e);
).join();
throwable = null;
catch (Exception e)
// catch everything. If the method has been wrapped in this aspect, we want to catch
// and retry for all exceptions.
throwable = e.getCause();
log.error(
"Failed to process on attempt ",
joinPoint.getSignature().getName(),
count + 1,
e);
delay = count == 0 ? initialDelay : count * multiplier * initialDelay;
log.info("Sleeping for seconds", delay);
Thread.sleep(delay);
count++;
while (Objects.nonNull(throwable) && count < multiplier
&& System.currentTimeMillis() - startTime < maxInterval);
log.debug("About to exit with success , count and delay ms", Objects.isNull(throwable), count, delay);
// if we have been through the retry loop and still have an exception, throw it.
if (throwable != null)
throw throwable;
return object;
我希望这可以帮助遇到类似问题的人
【讨论】：
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