在tomcat热部署中，解决jdbc无法释放，war包无法彻底删除的问题

本文链接：https://blog.youkuaiyun.com/liumengcheng/article/details/37598901

本文详细介绍了如何在web.xml中添加listener进行资源清理，并通过替换dbcp连接池为c3p0来解决bug，同时优化了applicationContext.xml配置和tomcat配置，最终达到提高应用性能的目的。

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在web.xml中添加一个listener

ServletContextLTest.java

package com.southgis.grid.csgl.cas;
import java.sql.Driver;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.Enumeration;
import java.util.Set;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import net.sf.ehcache.CacheManager;
public class ServletContextLTest implements ServletContextListener {
 @SuppressWarnings("deprecation")
 public void contextDestroyed(ServletContextEvent arg0) {
  System.out.println("public void contextDestroyed(ServletContextEvent arg0) {");
  CacheManager.getInstance().shutdown();
  Enumeration<Driver> drivers = DriverManager.getDrivers();
     while (drivers.hasMoreElements()) {
         Driver driver = drivers.nextElement();
         try {
             DriverManager.deregisterDriver(driver);
             System.out.println(driver.toString());
         } catch (SQLException e) {
             e.printStackTrace();
         }
     }
     Set<Thread> threadSet = Thread.getAllStackTraces().keySet();
     Thread[] threadArray = threadSet.toArray(new Thread[threadSet.size()]);
     for(Thread t:threadArray) {
         if(t.getName().contains("Abandoned connection cleanup thread")) {
             synchronized(t) {
                 t.stop(); //don't complain, it works
             }
         }
     }
 }
 public void contextInitialized(ServletContextEvent arg0) {
 }
}

web.xml中加

<listener>
    	<listener-class>com.southgis.grid.csgl.cas.ServletContextLTest</listener-class>
    </listener>

或者解决连接池的bug

package com.southgis.grid.csgl.cas;
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();
 }
}

修改applicationContext.xml文件：

<!--创建dataSource -->
	<bean id="dataSource" destroy-method="close" class="com.southgis.grid.csgl.cas.XBasicDataSource">
		<property name="driverClassName" value="${driverClassName}" />
		<property name="url" value="${url}" />
		<property name="username" value="${username}" />
		<property name="password" value="${password}" />
	</bean>

另外要修改tomcat软件bin目录下的catalina.bat文件

在echo Using CATALINA_BASE: "%CATALINA_BASE%"的前面加上

set JAVA_OPTS=%JAVA_OPTS% -server -XX:PermSize=256M -XX:MaxPermSize=512m

在tomcat目录/conf/context.xml的<Context>元素中增加属性antiJARLocking="true" antiResourceLocking="true"
如下所示
<Context antiJARLocking="true" antiResourceLocking="true">
。。。。。。
。。。。
</Context>

网上说dbcp连接池bug很多，所以就换了一个c3p0连接池