java - Hibernate 无法在 1 天后执行查询

一天后，我的 Web 应用程序出现以下错误。我没有对其进行大量搜索，因为还无法解决此问题。有人可以帮我吗？

Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: The last packet successfully received from the server was59461 milliseconds ago.The last packet sent successfully to the server was 59461 milliseconds ago, which  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:39)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:406)
    at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1074)
    at com.mysql.jdbc.MysqlIO.send(MysqlIO.java:3270)
    at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1932)
    at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2101)
    at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2554)
    at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1761)
    at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:1912)
    at org.hibernate.jdbc.AbstractBatcher.getResultSet(AbstractBatcher.java:186)
    at org.hibernate.loader.Loader.getResultSet(Loader.java:1778)
    at org.hibernate.loader.Loader.doQuery(Loader.java:662)
    at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:224)
    at org.hibernate.loader.Loader.doList(Loader.java:2211)
    ... 26 more
Caused by: java.net.SocketException: Broken pipe
    at java.net.SocketOutputStream.socketWrite0(Native Method)
    at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:92)
    at java.net.SocketOutputStream.write(SocketOutputStream.java:136)
    at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:65)
    at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:123)
    at com.mysql.jdbc.MysqlIO.send(MysqlIO.java:3251)
    ... 36 more

最佳答案

您需要配置 hibernate 以执行虚拟查询，以便您的连接保持 Activity 状态。

<!--connection pool-->
<property name="hibernate.dbcp.maxActive">10</property>
<property name="hibernate.dbcp.whenExhaustedAction">1</property>
<property name="hibernate.dbcp.maxWait">20000</property>
<property name="hibernate.dbcp.maxIdle">10</property>

<!-- prepared statement cache-->
<property name="hibernate.dbcp.ps.maxActive">10</property>
<property name="hibernate.dbcp.ps.whenExhaustedAction">1</property>
<property name="hibernate.dbcp.ps.maxWait">20000</property>
<property name="hibernate.dbcp.ps.maxIdle">10</property>

<!-- optional query to validate pooled connections:-->
<property name="hibernate.dbcp.validationQuery">select 1</property>
<property name="hibernate.dbcp.testOnBorrow">true</property>
<property name="hibernate.dbcp.testOnReturn">true</property>