title: Grails 2.3.0 and mysql connection timeout
body: <p>I have a Grails 2.2.3 application using this configuration to connect to a mysql database:</p>
  
  <pre><code> production {
      dataSource {
          dbCreate = "update" // one of 'create', 'create-drop','update'
          url = "jdbc:mysql://localhost/database?autoReconnect=true"
  
          pooled = true
          properties {
              maxActive = 50
              maxIdle = 25
              minIdle = 5
              initialSize = 5
              minEvictableIdleTimeMillis = 1800000
              timeBetweenEvictionRunsMillis = 1800000
              maxWait = 10000
  
          }
  
  
      }
  
  }
  </code></pre>
  
  <p>After upgrading to Grails 2.3.0 this stopped working and after a weekend of inactivity on the app I get this exception:</p>
  
  <pre><code>Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: The last packet successfully received from the server was 50,139,380 milliseconds ago.  The last packet sent successfully to the server was 50,139,380 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 com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
  at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1116)
  at com.mysql.jdbc.MysqlIO.send(MysqlIO.java:3352)
  at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1971)
  at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2151)
  at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2619)
  at com.mysql.jdbc.ConnectionImpl.setAutoCommit(ConnectionImpl.java:4997)
  ... 5 more
  Caused by: java.net.SocketException: Write failed: Broken pipe
  at jrockit.net.SocketNativeIO.socketWrite(SocketNativeIO.java:46)
  </code></pre>
  
  <p>Any ideas ?</p>