Question

我经常需要重新启动我们拥有的微服务，因为我在一段时间（6-12小时）后得到了一个DataAccessResourceFailureException和JDBCConnectionException（我在下面插入了堆栈跟踪）。我使用的是Spring数据，数据库是AWS RDS

这是我的配置文件的片段，我认为可以解决问题

spring.datasource.dbcp2.validation-query= SELECT 1 spring.datasource.dbcp2.test-while-idle= true spring.datasource.dbcp2.test-on-borrow= true spring.datasource.dbcp2.time-between-eviction-runs-millis= 5000

[E] s.s.s.TaskUtils$LoggingErrorHandler:    Unexpected error occurred in scheduled task.
org.springframework.dao.DataAccessResourceFailureException: could not prepare statement; nested exception is org.hibernate.exception.JDBCConnectionException: could not prepare statement
    at org.springframework.orm.jpa.vendor.HibernateJpaDialect.convertHibernateAccessException(HibernateJpaDialect.java:257)
    at org.springframework.orm.jpa.vendor.HibernateJpaDialect.translateExceptionIfPossible(HibernateJpaDialect.java:244)
    at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.translateExceptionIfPossible(AbstractEntityManagerFactoryBean.java:488)
    at org.springframework.dao.support.ChainedPersistenceExceptionTranslator.translateExceptionIfPossible(ChainedPersistenceExceptionTranslator.java:59)
    at org.springframework.dao.support.DataAccessUtils.translateIfNecessary(DataAccessUtils.java:213)
Caused by: org.hibernate.exception.JDBCConnectionException: could not prepare statement
    at org.hibernate.exception.internal.SQLExceptionTypeDelegate.convert(SQLExceptionTypeDelegate.java:48)
    at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:42)
    at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:109)
    at org.hibernate.engine.jdbc.internal.StatementPreparerImpl$StatementPreparationTemplate.prepareStatement(StatementPreparerImpl.java:182)
    at org.hibernate.engine.jdbc.internal.StatementPreparerImpl.prepareQueryStatement(StatementPreparerImpl.java:148)
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: No operations allowed after connection closed.
    at sun.reflect.GeneratedConstructorAccessor80.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:425)
    at com.mysql.jdbc.Util.getInstance(Util.java:408)
Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: The last packet successfully received from the server was 39,231,404 milliseconds ago.  The last packet sent successfully to the server was 39,231,405 milliseconds ago. is longer than the server configured value of 'wait_timeout'. You should consider either expiring and/or testing connection validity before use in your application, increasing the server configured values for client timeouts, or using the Connector/J connection property 'autoReconnect=true' to avoid this problem.
    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.jdbc.Util.handleNewInstance(Util.java:425)
Caused by: java.net.SocketException: Connection timed out (Write failed)
    at java.net.SocketOutputStream.socketWrite0(Native Method)
    at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:109)
    at java.net.SocketOutputStream.write(SocketOutputStream.java:153)
    at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:82)
    at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:140)

Answer 1

DataAccessResourceFailureException - ＆gt; 资源完全失败时抛出数据访问异常，例如：如果我们无法使用JDBC连接到数据库。我怀疑是由于连接而导致错误。

请尝试查看RDS的日志。

而且我从日志中理解的是MySQLNonTransientConnectionException。所以这是由于超时后从池中删除连接。

所以最好的选择是配置超时，驱逐时间更多。但是你的应用程序正在做的是正确的，不建议有更大的超时或驱逐时间

JDBCConnectionException有时使用spring数据和amazon RDS

1 个答案: