我正在使用带有MySQL的Spring Boot 1.3.1。我在我的日志中得到这个：
The last packet successfully received from the server was 97,025,381 milliseconds ago.
The last packet sent successfully to the server was 97,025,381 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.
完整筹码：
Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: The last packet successfully received from the server was 97,025,381 milliseconds ago. The last packet sent successfully to the server was 97,025,381 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) ~[na:1.8.0_66]
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[na:1.8.0_66]
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:1.8.0_66]
at java.lang.reflect.Constructor.newInstance(Constructor.java:422) ~[na:1.8.0_66]
at com.mysql.jdbc.Util.handleNewInstance(Util.java:404) ~[mysql-connector-java-5.1.38.jar!/:5.1.38]
at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:981) ~[mysql-connector-java-5.1.38.jar!/:5.1.38]
at com.mysql.jdbc.MysqlIO.send(MysqlIO.java:3652) ~[mysql-connector-java-5.1.38.jar!/:5.1.38]
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2460) ~[mysql-connector-java-5.1.38.jar!/:5.1.38]
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2625) ~[mysql-connector-java-5.1.38.jar!/:5.1.38]
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2547) ~[mysql-connector-java-5.1.38.jar!/:5.1.38]
at com.mysql.jdbc.ConnectionImpl.setAutoCommit(ConnectionImpl.java:4874) ~[mysql-connector-java-5.1.38.jar!/:5.1.38]
at sun.reflect.GeneratedMethodAccessor70.invoke(Unknown Source) ~[na:na]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_66]
at java.lang.reflect.Method.invoke(Method.java:497) ~[na:1.8.0_66]
at org.apache.tomcat.jdbc.pool.ProxyConnection.invoke(ProxyConnection.java:126) ~[tomcat-jdbc-8.0.30.jar!/:na]
at org.apache.tomcat.jdbc.pool.JdbcInterceptor.invoke(JdbcInterceptor.java:108) ~[tomcat-jdbc-8.0.30.jar!/:na]
at org.apache.tomcat.jdbc.pool.DisposableConnectionFacade.invoke(DisposableConnectionFacade.java:81) ~[tomcat-jdbc-8.0.30.jar!/:na]
at com.sun.proxy.$Proxy78.setAutoCommit(Unknown Source) ~[na:na]
at org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction.doBegin(JdbcTransaction.java:72) ~[hibernate-core-4.3.11.Final.jar!/:4.3.11.Final]
at org.hibernate.engine.transaction.spi.AbstractTransactionImpl.begin(AbstractTransactionImpl.java:162) ~[hibernate-core-4.3.11.Final.jar!/:4.3.11.Final]
at org.hibernate.internal.SessionImpl.beginTransaction(SessionImpl.java:1471) ~[hibernate-core-4.3.11.Final.jar!/:4.3.11.Final]
at org.hibernate.jpa.internal.TransactionImpl.begin(TransactionImpl.java:61) ~[hibernate-entitymanager-4.3.11.Final.jar!/:4.3.11.Final]
at org.springframework.orm.jpa.vendor.HibernateJpaDialect.beginTransaction(HibernateJpaDialect.java:170) ~[spring-orm-4.2.4.RELEASE.jar!/:4.2.4.RELEASE]
at org.springframework.orm.jpa.JpaTransactionManager.doBegin(JpaTransactionManager.java:380) ~[spring-orm-4.2.4.RELEASE.jar!/:4.2.4.RELEASE]
at org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:373) ~[spring-tx-4.2.4.RELEASE.jar!/:4.2.4.RELEASE]
at org.springframework.transaction.interceptor.TransactionAspectSupport.createTransactionIfNecessary(TransactionAspectSupport.java:427) ~[spring-tx-4.2.4.RELEASE.jar!/:4.2.4.RELEASE]
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:276) ~[spring-tx-4.2.4.RELEASE.jar!/:4.2.4.RELEASE]
... 80 common frames omitted
Caused by: java.net.SocketException: Broken pipe
at java.net.SocketOutputStream.socketWrite0(Native Method) ~[na:1.8.0_66]
at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:109) ~[na:1.8.0_66]
at java.net.SocketOutputStream.write(SocketOutputStream.java:153) ~[na:1.8.0_66]
at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:82) ~[na:1.8.0_66]
at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:140) ~[na:1.8.0_66]
at com.mysql.jdbc.MysqlIO.send(MysqlIO.java:3634) ~[mysql-connector-java-5.1.38.jar!/:5.1.38]
根据spring boot docs，tomcat-pool通常应该自动使用，因为我依赖于JPA启动器：
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
有没有办法检查这个？
/beans端点返回如下bean：
{
"bean": "dataSource",
"scope": "singleton",
"type": "org.apache.tomcat.jdbc.pool.DataSource",
"resource": "class path resource [org/springframework/boot/autoconfigure/jdbc/DataSourceAutoConfiguration$NonEmbeddedConfiguration.class]",
"dependencies": []
}
所以我认为它使用的是tomcat池。
此question讨论了spring.datasource.test-while-idle和spring.datasource.validation-interval。你需要设置它们来避免这个问题吗？
答案 0 :(得分：0)
spring-boot-starter-jdbc（也由jpa-data引用）依赖于Tomcat池，因此默认使用Tomcat池。您可以通过检查maven依赖关系列表轻松验证。 （您发布的堆栈跟踪也确认了这一点）。
这意味着您应该使用tomcat-pooling parameters：