java – Hibernate在1天后未能执行查询

一天之后,我的网络应用程序中出现以下错误.我没有很多搜索它无法解决这个问题.有人可以帮帮我吗？

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

解决方法:

您需要配置hibernate以执行虚拟查询,以便您的连接保持活动状态.

<!--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> 

标签：c3p0,java,mysql,hibernate,tomcat6
来源： https://codeday.me/bug/20190723/1514851.html