启动时报如下异常，是哪里出问题了呢？
异常如下：
2018-05-09 11:08:27.069:WARN:oejw.WebAppContext:main: Failed startup of context o.e.j.w.WebAppContext@67784306{/,file:///tmp/jetty-0.0.0.0-80-DrSkinCMS.war-_-any-3394470165053160227.dir/webapp/,UNAVAILABLE}{/DrSkinCMS.war}
java.lang.NullPointerException
at com.jfinal.plugin.druid.DruidPlugin.autoCheckValidationQuery(DruidPlugin.java:123)
at com.jfinal.plugin.druid.DruidPlugin.<init>(DruidPlugin.java:95)
at com.cms.common.DemoConfig.createDruidPlugin(DemoConfig.java:100)
at com.cms.common.DemoConfig.configPlugin(DemoConfig.java:108)
at com.jfinal.core.Config.configJFinal(Config.java:51)
at com.jfinal.core.JFinal.init(JFinal.java:63)
at com.jfinal.core.JFinalFilter.init(JFinalFilter.java:49)
at org.eclipse.jetty.servlet.FilterHolder.initialize(FilterHolder.java:139)
at org.eclipse.jetty.servlet.ServletHandler.initialize(ServletHandler.java:741)
at org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:374)
at org.eclipse.jetty.webapp.WebAppContext.startWebapp(WebAppContext.java:1497)
at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1459)
at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:785)
at org.eclipse.jetty.servlet.ServletContextHandler.doStart(ServletContextHandler.java:287)
at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:545)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
at org.eclipse.jetty.deploy.bindings.StandardStarter.processBinding(StandardStarter.java:46)
at org.eclipse.jetty.deploy.AppLifeCycle.runBindings(AppLifeCycle.java:192)
at org.eclipse.jetty.deploy.DeploymentManager.requestAppGoal(DeploymentManager.java:505)
at org.eclipse.jetty.deploy.DeploymentManager.addApp(DeploymentManager.java:151)
at org.eclipse.jetty.deploy.providers.ScanningAppProvider.fileAdded(ScanningAppProvider.java:180)
at org.eclipse.jetty.deploy.providers.WebAppProvider.fileAdded(WebAppProvider.java:453)
at org.eclipse.jetty.deploy.providers.ScanningAppProvider$1.fileAdded(ScanningAppProvider.java:64)
at org.eclipse.jetty.util.Scanner.reportAddition(Scanner.java:610)
at org.eclipse.jetty.util.Scanner.reportDifferences(Scanner.java:529)
at org.eclipse.jetty.util.Scanner.scan(Scanner.java:392)
at org.eclipse.jetty.util.Scanner.doStart(Scanner.java:313)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
at org.eclipse.jetty.deploy.providers.ScanningAppProvider.doStart(ScanningAppProvider.java:150)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
at org.eclipse.jetty.deploy.DeploymentManager.startAppProvider(DeploymentManager.java:579)
at org.eclipse.jetty.deploy.DeploymentManager.doStart(DeploymentManager.java:240)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:138)
at org.eclipse.jetty.server.Server.start(Server.java:419)
at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:117)
at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:113)
at org.eclipse.jetty.server.Server.doStart(Server.java:386)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
at org.eclipse.jetty.xml.XmlConfiguration$1.run(XmlConfiguration.java:1588)
at org.eclipse.jetty.xml.XmlConfiguration$1.run(XmlConfiguration.java:1512)
at java.security.AccessController.doPrivileged(Native Method)
at org.eclipse.jetty.xml.XmlConfiguration.main(XmlConfiguration.java:1511)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.eclipse.jetty.start.Main.invokeMain(Main.java:220)
at org.eclipse.jetty.start.Main.start(Main.java:486)
at org.eclipse.jetty.start.Main.main(Main.java:77)
2018-05-09 11:08:27.099:INFO:oeja.AnnotationConfiguration:main: Scanning elapsed time=3ms
