jdbc - 为了防止内存泄漏，已强制注销JDBC驱动程序

当我停止tomcat7.0时，我明白了。我无法解决它。任何帮助将不胜感激。

SEVERE: The web application [/marketservice] registered the JDBC driver[oracle.jdbc.driver.OracleDriver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.
2011-10-13 9:11:27 org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [/marketservice] appears to have started a thread named [FileWatchdog] but has failed to stop it. This is very likely to create a memory leak.
2011-10-13 9:11:27 org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [/marketservice] appears to have started a thread named [Timer-0] but has failed to stop it. This is very likely to create a memory leak.
2011-10-13 9:11:27 org.apache.catalina.loader.WebappClassLoader checkThreadLocalMapForLeaks
SEVERE: The web application [/marketservice] created a ThreadLocal with key of type [com.opensymphony.xwork2.inject.ContainerImpl$10] (value [com.opensymphony.xwork2.inject.ContainerImpl$10@e24fa8]) and a value of type [java.lang.Object[]] (value [[Ljava.lang.Object;@1dba740]) 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.
2011-10-13 9:11:27 org.apache.coyote.AbstractProtocolHandler stop
INFO: Stopping ProtocolHandler ["http-bio-8080"]
2011-10-13 9:11:27 org.apache.coyote.AbstractProtocolHandler stop
INFO: Stopping ProtocolHandler ["ajp-bio-8009"]

最佳答案

我知道您的话题不再是崭新的，而是我在WatchDog中遇到的同样问题

（与JDBC连接的部分已经解决：link to Tomcat wiki）


似乎已启动名为[FileWatchdog]的线程，但未能停止该线程。这很可能造成内存泄漏。


他们尝试在log4j link to log4j bug parade的下一发行版中对其进行修复。

但我认为有办法解决。我像这样启动“ WatchDog”：

@PostConstruct
private void initLogging(File log4JConfig) {

    if (loggingExecutor == null) {
        LogManager.resetConfiguration();
        XMLWatchdog xdog = new XMLWatchdog(log4JConfig.getAbsolutePath());
        loggingExecutor = Executors.newSingleThreadScheduledExecutor();

        loggingExecutor.scheduleAtFixedRate(xdog, 0, 5, TimeUnit.MINUTES);
        Logger logger = Logger.getLogger(ConfigurationService.class);
        logger.info("Logging is initialized with the following configuration file: " + log4JConfig.getAbsolutePath());
    } else {
        logger.info("Logger is already ruinning");
    }

}

/**
 * Nasty bug:
 *
 * https://issues.apache.org/bugzilla/show_bug.cgi?id=4913
 *
 *
 * @author Johannes.Hoehne
 *
 */
private static class XMLWatchdog extends FileWatchdog {

    XMLWatchdog(String filename) {
        super(filename);
        setName("LogFileChecker");
    }

    public void doOnChange() {
        new DOMConfigurator().doConfigure(filename, LogManager.getLoggerRepository());
    }

    @Override
    public void run() {
        checkAndConfigure();
    }
}

然后像这样再停下来

    @PreDestroy
public void shutDownLogger() {
    logger.info("Will shut down logger task " + loggingExecutor);
    loggingExecutor.shutdown();
}