Tomcat不会停止。我该怎么调试呢？ [英] Tomcat doesn't stop. How can I debug this?
问题描述
我在Linux中运行 Tomcat 7 ，我通过 $ CATALINA_HOME / bin / startup.sh 启动关闭通过 $ CATALINA_HOME / bin / shutdown.sh
来自 /etc/init.d
I have a Tomcat 7 running in Linux that I start via $CATALINA_HOME/bin/startup.sh and shutdown via $CATALINA_HOME/bin/shutdown.sh
from /etc/init.d
除1个问题外，一切正常。有时tomcat不会停止。
虽然我停止它，但我看到catalina.out日志正在下降，如果我做 ps -ef 我仍然可以看到进程正在运行。
All is ok except 1 problem. Sometimes tomcat does not stop.
Although I stop it and I see in catalina.out logs that is going down, if I do ps -ef I can still see the process running.
可能是什么问题？我该怎么调试呢？我的感觉是，这与线程有关。
What could be the problem? How can I debug this? My feeling is, that this is related to threads.
所以可疑的部分如下：
1）我使用Log4j的LogManager来检测log4j配置是否已经改变，但是我在 contextDestroyed上执行 Log4jManager.shutdown ServletContextListener
2）我使用 H2 数据库，我在关机时看到：
So the parts that are suspicious are the following:
1) I use Log4j's LogManager to detect if the log4j configuration has been changed, but I do Log4jManager.shutdown on a contextDestroyed ServletContextListener
2) I use H2 database and I see on shutdown:
严重：Web应用程序[/ MyApplication]似乎已经启动了一个名为[H2 Log Writer MYAPPLICATION]的
线程但未能阻止它。
这很可能会创建内存泄漏
SEVERE: The web application [/MyApplication] appears to have started a
thread named [H2 Log Writer MYAPPLICATION] but has failed to stop it.
This is very likely to create a memory leak
严重：Web应用程序[/ MyApplication]似乎已经启动了一个名为[H2 File Lock Watchdog
的
线程b $ b /opt/myOrg/tomcat/webapps/MyApplication/db/myDatabase.lock.db]但是有
未能阻止它。这很可能造成内存泄漏。 4月2日，
2012 9:08:08 AM org.apache.catalina.loader.WebappClassLoader
clearReferencesThreads严重：网络应用程序[/ MyApplication]
似乎已经启动了一个名为[FileWatchdog]的线程，但是已经失败了
来阻止它。这很可能造成内存泄漏。
SEVERE: The web application [/MyApplication] appears to have started a
thread named [H2 File Lock Watchdog
/opt/myOrg/tomcat/webapps/MyApplication/db/myDatabase.lock.db] but has
failed to stop it. This is very likely to create a memory leak. Apr 2,
2012 9:08:08 AM org.apache.catalina.loader.WebappClassLoader
clearReferencesThreads SEVERE: The web application [/MyApplication]
appears to have started a thread named [FileWatchdog] but has failed
to stop it. This is very likely to create a memory leak.
请帮忙吗？我怎样才能在这里发现问题？
Any help please? How can I detect the problem here?
更新：
我做了 kill -3 正如@daveb和catalina.out所建议的那样，我看到：
UPDATE:
I did a kill -3 as suggested by @daveb, and in the catalina.out I see:
JVMDUMP006I正在处理转储事件user，详情 - 请等待。
JVMDUMP032I JVM使用
'/etc/init.d/javacore.20120402.093922.2568.0001.txt'请求Java转储以响应写入
/ etc的
事件JVMDUMP010I Java转储/init.d/javacore.20120402.093922.2568.0001.txt JVMDUMP013I
已处理的转储事件user，详细信息。
JVMDUMP006I Processing dump event "user", detail "" - please wait. JVMDUMP032I JVM requested Java dump using '/etc/init.d/javacore.20120402.093922.2568.0001.txt' in response to an event JVMDUMP010I Java dump written to /etc/init.d/javacore.20120402.093922.2568.0001.txt JVMDUMP013I Processed dump event "user", detail "".
/etc/init.d 中有一个javacore但我不喜欢不知道如何处理它。即我应该调查哪些部分
There is a javacore in /etc/init.d but I don't know how to process it. I.e. what parts should I investigate
推荐答案
如果Web应用程序已停止，则还应关闭与数据库的所有连接。如果您没有连接列表，则执行SQL语句shutdown（这仅适用于H2和HSQLDB数据库）。
If the web application is stopped, all connections to the database should be closed as well. If you don't have a list of connections, then execute the SQL statement "shutdown" (this only works for the H2 and HSQLDB databases).
如果您有注册了一个Servlet，您可以在 Servlet.destroy（）方法中执行此操作。
If you have a registered a Servlet, you can do that in the Servlet.destroy() method.
如果您已注册 ServletContextListener ，则可以在 org.h2.server.web.DbStarter ServletContextListener 是（H2数据库中包含的那个） ）。
If you have registered a ServletContextListener, you can execute the "shutdown" statement in the ServletContextListener.contextDestroyed(ServletContextEvent servletContextEvent) method. This is what org.h2.server.web.DbStarter ServletContextListener does (the one that is included in the H2 database).
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