我要评论今天关闭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
解决oracle.jdbc.oracledriver和threadlocal中的错误
在项目target目录下找到web-info下的lib,在lib中把ojdbc6.jar删除，当然你tomcat中lib目录下要有ojdbc6.jar才行。
运行 ，没有报错信息， 完美解决！
总结
以上为个人经验，希望能给大家一个参考，也希望大家多多支持代码网。
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