完美解决Tomcat关闭后报错问题_Tomcat

今天关闭tomcat时报错

如下所示：

06-may-2019 17:10:13.543 警告 [localhost-startstop-1] org.apache.catalina.loader.webappclassloaderbase.clearreferencesthreads the web application [root] registered the jdbc driver [com.alibaba.druid.proxy.druiddriver] but failed to unregister it when the web application was stopped. to prevent a memory leak, the jdbc driver has been forcibly unregistered.
06-may-2019 17:10:13.543 警告 [localhost-startstop-1] org.apache.catalina.loader.webappclassloaderbase.clearreferencesthreads the web application [root] appears to have started a thread named [druid-connectionpool-create-316799830] but has failed to stop it. this is very likely to create a memory leak. stack trace of thread:
sun.misc.unsafe.park(native method)
java.util.concurrent.locks.locksupport.park(locksupport.java:175)
java.util.concurrent.locks.abstractqueuedsynchronizer conditionobject.await( abstractqueuedsynchronizer.java:2039 ) com.alibaba.druid.pool.druiddata source conditionobject.await(abstractqueuedsynchronizer.java:2039) com.alibaba.druid.pool.druiddatasource conditionobject.await(abstractqueuedsynchronizer.java:2039)com.alibaba.druid.pool.druiddatasourcecreateconnectionthread.run(druiddatasource.java:2443)

06-may-2019 16:00:49.348 警告 [localhost-startstop-1] org.apache.catalina.loader.webappclassloaderbase.clearreferencesjdbc the web application [root] registered the jdbc 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.
06-may-2019 15:39:25.116 严重 [localhost-startstop-1] org.apache.catalina.loader.webappclassloaderbase.checkthreadlocalmapforleaks the web application [root] created a threadlocal with key of type [java.lang.threadlocal] (value [java.lang.threadlocal@770cddd]) and a value of type [java.lang.class] (value [class oracle.sql.anydatafactory]) but failed to remove it when the web application was stopped. threads are going to be renewed over time to try and avoid a probable memory leak.
06-may-2019 15:39:25.116 严重 [localhost-startstop-1] org.apache.catalina.loader.webappclassloaderbase.checkthreadlocalmapforleaks the web application [root] created a threadlocal with key of type [java.lang.threadlocal] (value [java.lang.threadlocal@799b61b6]) and a value of type [java.lang.class] (value [class oracle.sql.typedescriptorfactory]) but failed to remove it when the web application was stopped. threads are going to be renewed over time to try and avoid a probable memory leak.

项目是springboot+ssm+oracle,报错的主要原因就是在关闭tomcat时没有将一些资源释放出去，从而导致错误

解决方法

如下所示：

解决com.alibaba.druid.proxy.druiddriver和druid-connectionpool-create报错

要编写如下类

import com.alibaba.druid.pool.druiddatasource;
import com.smm.datasource.dynamicdatasource;
import org.slf4j.logger;
import org.slf4j.loggerfactory;
import javax.servlet.servletcontextevent;
import javax.servlet.servletcontextlistener;
import javax.servlet.annotation.weblistener;
import java.sql.driver;
import java.sql.drivermanager;
import java.sql.sqlexception;
import java.util.enumeration;
import java.util.iterator;
import java.util.map;
/**
 * @description: servlet容器销毁时，需要释放一些资源，避免报错
 * @author: songmingming
 * @create: 2019-05-06 16:35
 */
@weblistener
public class  contextfinalizelistener implements servletcontextlistener  {
    private logger logger = loggerfactory.getlogger(testconfig.class);
    @override
    public void contextinitialized(servletcontextevent servletcontextevent) {
    }
    @override
    public void contextdestroyed(servletcontextevent servletcontextevent) {
        dynamicdatasource dynamicdatasource = dynamicdatasource.getinstance();
        map<object, object> datasourcemap = dynamicdatasource.getdatasourcemap();
        iterator<map.entry<object, object>> iterator = datasourcemap.entryset().iterator();
        while (iterator.hasnext()) {
            string key = (string) iterator.next().getkey();
            druiddatasource   datasource = (druiddatasource)datasourcemap.get(key);
            //将datesource关闭 解决了 org.apache.catalina.loader.webappclassloaderbase.clearreferencesthreads the web application [root] appears to have started a thread named [druid-connectionpool-create-316799830] but has failed to stop it. this is very likely to create a memory leak.
            datasource.close();
        }
        //解决关闭tomcat时报错 registered the jdbc driver [com.alibaba.druid.proxy.druiddriver] but failed to unregister it when the web application was stopped. to prevent a memory leak, the jdbc driver has been forcibly unregistered.
        // 高版本tomcat添加了一些对数据库连接的监听，当tomcat关闭时，若这些连接未关 闭，tomcat会提示错误，但tomcat会帮我们关闭掉这些连接
        enumeration<java.sql.driver> drivers = drivermanager.getdrivers();
        while (drivers.hasmoreelements()) {
            java.sql.driver driver = drivers.nextelement();
                try {
                    drivermanager.deregisterdriver(driver);
                } catch (sqlexception ex) {
                    if (logger.iserrorenabled()) {
                        logger.error("关闭连接池错误",ex);
                    }
                }
        }
    }
}

上面代码，因为我采用的是多数据源，

所有数据源信息druiddatesource都是放在map中的，所以获取遍历了map

解决druid-connectionpool-create，主要代码就是调用druiddatesource.close就行了