Eugene Burtsev's blog

Prevent iBatis org.apache.ibatis.transaction. TransactionException if the Database Connection Is Temporarily Lost

Sometimes there is an unpleasant situation when the database server goes to reboot. In this case, we can catch a nasty exception like this:

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Caused by: org.apache.ibatis.exceptions.PersistenceException:
### Error opening session.  Cause: org.apache.ibatis.transaction.TransactionException: Error configuring AutoCommit.  Your driver may not support getAutoCommit() or setAutoCommit(). Requested setting: false.  Cause: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: The last packet successfully received from the server was 59,121,876 milliseconds ago.  The last packet sent successfully to the server was 59,121,984 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.
### Cause: org.apache.ibatis.transaction.TransactionException: Error configuring AutoCommit.  Your driver may not support getAutoCommit() or setAutoCommit(). Requested setting: false.  Cause: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: The last packet successfully received from the server was 59,121,876 milliseconds ago.  The last packet sent successfully to the server was 59,121,984 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 org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:8)
        at org.apache.ibatis.session.defaults.DefaultSqlSessionFactory.openSessionFromDataSource(DefaultSqlSessionFactory.java:83)
        at org.apache.ibatis.session.defaults.DefaultSqlSessionFactory.openSession(DefaultSqlSessionFactory.java:32)
        at com.greytower.htmltemplates.core.dao.ibatis.TemplatesDAOImpl.readAll(TemplatesDAOImpl.java:70)
        at com.greytower.htmltemplates.beans.TemplatesEditorBean.init(TemplatesEditorBean.java:86)
        ... 59 more
Caused by: org.apache.ibatis.transaction.TransactionException: Error configuring AutoCommit.  Your driver may not support getAutoCommit() or setAutoCommit(). Requested setting: false.  Cause: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: The last packet successfully received from the server was 59,121,876 milliseconds ago.  The last packet sent successfully to the server was 59,121,984 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 org.apache.ibatis.transaction.jdbc.JdbcTransaction.setDesiredAutoCommit(JdbcTransaction.java:51)
        at org.apache.ibatis.transaction.jdbc.JdbcTransaction.<init>(JdbcTransaction.java:19)
        at org.apache.ibatis.transaction.jdbc.JdbcTransactionFactory.newTransaction(JdbcTransactionFactory.java:15)
        at org.apache.ibatis.session.defaults.DefaultSqlSessionFactory.openSessionFromDataSource(DefaultSqlSessionFactory.java:78)
        ... 62 more
Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: The last packet successfully received from the server was 59,121,876 milliseconds ago.  The last packet sent successfully to the server was 59,121,984 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.

To solve this problem you need to set the poolPingQuery and poolPingEnabled properties in the iBatis config file. For example, see lines 17 and 18 in code below.

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<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>

  <typeAliases>
      ...
  </typeAliases>

  <environments default="development">
      <environment id="development">
          <transactionManager type="JDBC" />
          <dataSource type="POOLED">
              <property name="driver" value="${db.driver}" />
              <property name="url" value="${db.url}" />
              <property name="username" value="${db.user}" />
              <property name="password" value="${db.password}" />
              <property name="poolPingQuery" value="SELECT id FROM user WHERE id = 1" />
              <property name="poolPingEnabled" value="true" />
          </dataSource>
      </environment>
  </environments>

</configuration>

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