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.
------------------------------------------------------------------------------------------------------------------------------------------------------
原因如下：
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
由于JDBC连接池用的是dbcp，dbcp1.3/1.4连接池没有自动的去回收空闲连接的功能,在1.3.1、1.4.1版本做了修复 (可以替换成新版本试试，亦可以按以下方案重写，也可以考虑使用c3p0，它有自动回收空闲连接功能）
-------------------------------------------------------------------------------------------------------------------
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：
问题解决~
-------------------------------------------------------------------------------------------------------------
第二个问题
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 因为我用的是oracle 但是把mysql和oracle的jar包都加进去了 删掉即可 ok~
-----------------------------------------------------------------------------------------------------------------
补充参考:
http://wy649898543.iteye.com/blog/1440165
http://weizuqing1986-126-com.iteye.com/blog/812748