registered the JDBC driver [com.mysql.jdbc.Driver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.

问题是tomcat的版本问题，tomcat新检测机制导致的这个问题，换版本可以解决问题，但不建议这么做，租用服务器不是你说换就换的。
其实问题根源是BasicDataSource，BasicDataSource类close()的一个Bug。

BasicDataSource's method close() doesn't deregister JDBC driver. This causes permgen memory leaks in web server environments, during context reloads. For example, using Tomcat 6.0.26 with Spring, and BasicDataSource declared in Spring context, there is a message printed at web application reload:

SEVERE: A web application registered the JBDC driver [com.mysql.jdbc.Driver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.

解决方法：

继承org.apache.commons.dbcp.BasicDataSource 重写close()

package cn.com.do1.component.common.jdbc;
import org.apache.commons.dbcp.BasicDataSource;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.SQLFeatureNotSupportedException;
import java.util.logging.Logger;
/**
 * Created by ao.ouyang on 15-11-18.
 */
public class BasicDataSourceExt extends BasicDataSource {
  @Override
  public <T> T unwrap(Class<T> iface) throws SQLException {
    // TODO Auto-generated method stub
    return null;
  }
  @Override
  public boolean isWrapperFor(Class<?> iface) throws SQLException {
    // TODO Auto-generated method stub
    return false;
  }
  @Override
  public synchronized void close() throws SQLException {
    DriverManager.deregisterDriver(DriverManager.getDriver(url));
    super.close();
  }
  @Override
  public Logger getParentLogger() throws SQLFeatureNotSupportedException {
    return null;
  }
}

然后用BasicDataSourceExt 替换spring配置文件中的数据源bean的class

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