由于jdbc驱动程序加载,Tomcat无法启动

Question

这是tomcat启动日志的相关部分:

SEVERE: Context [/f360] startup failed due to previous errors
Apr 8, 2010 6:45:56 PM org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc
SEVERE: A web application registered the JBDC driver [org.apache.derby.jdbc.ClientDriver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.
Apr 8, 2010 6:45:56 PM org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc
SEVERE: A web application registered the JBDC 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.
Apr 8, 2010 6:45:56 PM org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc
SEVERE: A web application registered the JBDC driver [com.microsoft.sqlserver.jdbc.SQLServerDriver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.

它导致的问题是它基本上导致Web应用程序无法正常启动.

任何想法如何解决这一问题？

Answer 1

显然,这是JDBC提供程序堆栈中的错误.但无论如何,我在Jetty中使用了一些类似的代码:

    public class CleanupContextListener implements ServletContextListener {
@Override
public void contextDestroyed(ServletContextEvent servletContextEvent) {
    Logger logger = Logger.getLogger("CleanupContextListener");
    Enumeration<Driver> drivers = DriverManager.getDrivers();
    while (drivers.hasMoreElements()) {
        Driver driver = drivers.nextElement();
        ClassLoader driverclassLoader = driver.getClass().getClassLoader();
        ClassLoader thisClassLoader = this.getClass().getClassLoader();
        if (driverclassLoader != null && thisClassLoader != null &&  driverclassLoader.equals(thisClassLoader)) {
            try {
                logger.warn("Deregistering: " + driver);
                DriverManager.deregisterDriver(driver);
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
}
@Override
public void contextInitialized(ServletContextEvent servletContextEvent) {}    

}

Answer 2

如果是DBCP问题,那么停止tomcat,杀死任何剩余进程(如果你运行多个tomcat),删除tomcat临时目录(也许还有工作目录),然后再试一次.

Answer 3

有时，尤其是在Tomcat上使用Spring应用程序时，错误消息具有误导性-当与任何JDBC驱动程序错误完全无关，而只是某些应用程序BEAN初始化方法（或@PostConstruct）失败时。错误堆栈跟踪已隐藏，仅显示在tomcat / logs / localhost.xxx文件中。请注意这种行为。这花了我很多时间。

此致，Yosi Lev

Answer 4

有关 JDBC 驱动程序的 SEVERE 消息是由 DBCP 问题引起的。参见DBCP-332