解决Memory Leak问题

异常如下：
2012-2-9 17:43:12 org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc
严重: The web application [/codeMarket] 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.
2012-2-9 17:43:12 org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc
严重: The web application [/codeMarket] registered the JBDC driver [oracle.jdbc.OracleDriver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.
2012-2-9 17:43:12 org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
严重: The web application [/codeMarket] appears to have started a thread named [Timer-0] but has failed to stop it. This is very likely to create a memory leak.
2012-2-9 17:43:12 org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
严重: The web application [/codeMarket] created a ThreadLocal with key of type [null] (value [com.opensymphony.xwork2.inject.ContainerImpl$10@e1666]) and a value of type [java.lang.Object[]] (value [[Ljava.lang.Object;@e0ada6]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.
2012-2-9 17:43:12 org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
严重: The web application [/codeMarket] created a ThreadLocal with key of type [null] (value [com.opensymphony.xwork2.inject.ContainerImpl$10@a8a314]) and a value of type [java.lang.Object[]] (value [[Ljava.lang.Object;@16ab2e8]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.
AbandonedObjectPool is used (org.apache.commons.dbcp.AbandonedObjectPool@11f1f12)
LogAbandoned: false
RemoveAbandoned: true
RemoveAbandonedTimeout: 3600

搜了一堆资料终于搞懂了 赶紧记下来~~
第一个问题：
严重: The web application [/codeMarket] registered the JBDC driver [oracle.jdbc.OracleDriver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.

网上资料:
详细如下：
应用程序注册了JDBC驱动，但当程序停止时无法注销这个驱动，tomcat为了防止内存溢出，就给强制注销了
https://issues.apache.org/jira/browse/DBCP-332

解决：
重写了org.apache.commons.dbcp.BasicDataSource 的 close（）方法：

package org.company.util;
import java.sql.DriverManager;
import java.sql.SQLException;
import org.apache.commons.dbcp.BasicDataSource;

public class XBasicDataSource extends BasicDataSource{
    @Override
    public synchronized void close() throws SQLException{
　　　　//  System.out.println("......输出数据源Driver的url："+DriverManager.getDriver(url));
     　DriverManager.deregisterDriver(DriverManager.getDriver(url));
　　　　super.close();
    }
}

在dbcp数据源中的配置：

class="org.company.util.XBasicDataSource" destroy-method="close">
value="oracle.jdbc.driver.OracleDriver">
value="jdbc:oracle:thin:@XX.XXX.XX.X:1521:ccdb">

问题解决~

再重新加载的时候发现还有：
严重: The web application [/codeMarket] 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.
2012-2-9 17:43:12 org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc
检查了一下jar包 发现多了一个mysql-connector-java-bin.jar 赶紧删之 ok~