Hibernate closing MySQL connection

Question

I'am unable to log in to my application after some hours of inactivity. Iam using Java, Spring Security, Struts 1.3 and Hibernate.

This is the log i found related to this issue

2014-07-30 14:11:40 INFO LocalSessionFactoryBean:246 - Closing Hibernate SessionFactory

java.io.EOFException
    at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:1388)
    at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:1532)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:1923)
    at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1163)
    at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1272)
    at com.mysql.jdbc.Connection.execSQL(Connection.java:2236)
    at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:1555)
    at org.hibernate.jdbc.AbstractBatcher.getResultSet(AbstractBatcher.java:186)
    at org.hibernate.loader.Loader.getResultSet(Loader.java:1787)

/var/lib/tomcat7/logs# 2014-07-30 14:11:40 INFO  SessionFactoryImpl:769 - closing
    at org.hibernate.loader.Loader.doQuery(Loader.java:674)
    at  org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:236)
    at org.hibernate.loader.Loader.doList(Loader.java:2220)
    at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2104)
    at org.hibernate.loader.Loader.list(Loader.java:2099)
    at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:378)
    at org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:338)
    at org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:172)
    at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1121)
    at org.hibernate.impl.QueryImpl.list(QueryImpl.java:79)
    at org.hibernate.impl.AbstractQueryImpl.uniqueResult(AbstractQueryImpl.java:811)
    at se.etm.ewo.daoImpl.UserDaoImpl.getUserByUsername(Unknown Source)
    at se.etm.ewo.daoImpl.UserDaoImpl.loadUserByUsername(Unknown Source)
    at org.springframework.security.authentication.dao.DaoAuthenticationProvider.retrieveUser(DaoAuthenticationProvider.java:82)
    at org.springframework.security.authentication.dao.AbstractUserDetailsAuthenticationProvider.authenticate(AbstractUserDetailsAuthenticationProvider.java:124)
    at org.springframework.security.authentication.ProviderManager.doAuthentication(ProviderManager.java:120)
    at org.springframework.security.authentication.AbstractAuthenticationManager.authenticate(AbstractAuthenticationManager.java:48)
    at org.springframework.security.authentication.ProviderManager.doAuthentication(ProviderManager.java:138)

This is my configuration file properties for hibernate

  <property name="hibernate.dialect">se.etm.ewo.hibernate.CustomDialect</property> <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property> <property name="hibernate.connection.url">jdbc:mysql://my_ip:my_port/my_database</property> <property name="hibernate.connection.username">username</property> <property name="hibernate.connection.password">password</property> <property name="hibernate.connection.autoReconnect">true</property> <property name="hibernate.connection.autoReconnectForPools">true</property> <property name="hibernate.c3p0.idle_test_period">100</property> <!-- Echo all executed SQL to stdout --> <property name="show_sql">true</property> 

and this is the spring configuration file properties

    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"
    destroy-method="close">
    <property name="driverClass">
        <value>com.mysql.jdbc.Driver</value>
    </property>
    <property name="jdbcUrl">
        <value>jdbc:mysql://my_ip:my_port/my_database</value>
    </property>
    <property name="user">
        <value>username</value>
    </property>
    <property name="password">
        <value>password</value>
    </property>
    <property name="initialPoolSize">
        <value>10</value>
    </property>
    <property name="maxPoolSize">
        <value>30</value>
    </property>
    <property name="minPoolSize">
        <value>10</value>
    </property>
    <property name="maxConnectionAge">
        <value>3600</value>
    </property>
    <property name="maxIdleTime">
        <value>3600</value>
    </property>
    <property name="maxIdleTimeExcessConnections">
        <value>1800</value>
    </property>
    <property name="acquireRetryAttempts">
        <value>3</value>
    </property>
    <property name="acquireRetryDelay">
        <value>3000</value>
    </property>
    <property name="breakAfterAcquireFailure">
        <value>false</value>
    </property>
    <property name="preferredTestQuery">
        <value>SELECT 1</value>
    </property>
</bean>

Please help me to fix this issue.

Answer 1

MySQL will close idle connections after 8 hours by default(that's the wait_timeout parameter in my.ini file).

• So, naturally you can edit my.ini file and change the value of wait_timeout , or just simply type the following command in mysql shell: SET GLOBAL wait_timeout=86400

• You can also set a property validationQuery in your hibernate config file: <property name="validationQuery">select 1</property> I prefer this one.

Know more about validationQuery : http://people.apache.org/~fhanik/tomcat/jdbc-pool.html