解决memory leak问题

原文地址：leak问题">解决memory leak问题作者：JavaLeader

异常如下：

 2012-2-9 17:43:12org.apache.catalina.loader.WebappClassLoaderclearReferencesJdbc
严重: The web application [/codeMarket] registered the JBDC driver[com.mysql.jdbc.Driver] but failed to unregister it when the webapplication was stopped. To prevent a memory leak, the JDBC Driverhas been forcibly unregistered.
2012-2-9 17:43:12 org.apache.catalina.loader.WebappClassLoaderclearReferencesJdbc
严重: The web application [/codeMarket] registered the JBDC driver[oracle.jdbc.OracleDriver] but failed to unregister it when the webapplication was stopped. To prevent a memory leak, the JDBC Driverhas been forcibly unregistered.
2012-2-9 17:43:12 org.apache.catalina.loader.WebappClassLoaderclearReferencesThreads
严重: The web application [/codeMarket] appears to have started athread named [Timer-0] but has failed to stop it. This is verylikely to create a memory leak.
2012-2-9 17:43:12 org.apache.catalina.loader.WebappClassLoaderclearThreadLocalMap
严重: The web application [/codeMarket] created a ThreadLocal withkey of type [null] (value[com.opensymphony.xwork2.inject.ContainerImpl$10@e1666]) and avalue of type [java.lang.Object[]] (value[[Ljava.lang.Object;@e0ada6]) but failed to remove it when the webapplication was stopped. This is very likely to create a memoryleak.
2012-2-9 17:43:12 org.apache.catalina.loader.WebappClassLoaderclearThreadLocalMap
严重: The web application [/codeMarket] created a ThreadLocal withkey of type [null] (value[com.opensymphony.xwork2.inject.ContainerImpl$10@a8a314]) and avalue of type [java.lang.Object[]] (value[[Ljava.lang.Object;@16ab2e8]) but failed to remove it when the webapplication was stopped. This is very likely to create a memoryleak.
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 webapplication was stopped. To prevent a memory leak, the JDBC Driverhas been forcibly unregistered.

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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 

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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() throwsSQLException{
//  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~

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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 webapplication was stopped. To prevent a memory leak, the JDBC Driverhas been forcibly unregistered.
2012-2-9 17:43:12 org.apache.catalina.loader.WebappClassLoaderclearReferencesJdbc

检查了一下jar包 发现多了一个mysql-connector-java-bin.jar  赶紧删之   ok~