StrutsPrepareAndExecuteFilter 这个错误是为什么，
八月 16, 2017 3:26:21 下午 org.apache.catalina.core.StandardContext filterStart严重: Exception starting filter
java.lang.ClassNotFoundException: org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1269)
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1104)
at org.apache.catalina.core.DefaultInstanceManager.loadClass(DefaultInstanceManager.java:508)
at org.apache.catalina.core.DefaultInstanceManager.loadClassMaybePrivileged(DefaultInstanceManager.java:489)
at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:119)
at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:262)
at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:108)
at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4481)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5121)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1425)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1415)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:134)
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:941)
at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:839)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1425)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1415)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:134)
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:941)
at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:258)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.core.StandardService.startInternal(StandardService.java:422)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:770)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.startup.Catalina.start(Catalina.java:657)
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.apache.catalina.startup.Bootstrap.start(Bootstrap.java:355)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:495)
今天上午导入项目，可以说导入好几次了，都是这两个问题。希望有人来帮忙解决下。
上面是第一个问题，因为不知道怎么放图片所以就粘贴过来了。
下面是另外一个问题
八月 16, 2017 3:26:57 下午 org.apache.catalina.loader.WebappClassLoaderBase clearReferencesThreads
警告: The web application appears to have started a thread named but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
java.lang.Object.wait(Native Method)
java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:143)
com.mysql.jdbc.AbandonedConnectionCleanupThread.run(AbandonedConnectionCleanupThread.java:40)
八月 16, 2017 3:26:57 下午 org.apache.catalina.loader.WebappClassLoaderBase clearReferencesThreads
警告: The web application appears to have started a thread named but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
java.net.TwoStacksPlainDatagramSocketImpl.receive0(Native Method)
java.net.TwoStacksPlainDatagramSocketImpl.receive(TwoStacksPlainDatagramSocketImpl.java:114)
java.net.DatagramSocket.receive(DatagramSocket.java:812)
net.sf.ehcache.distribution.MulticastKeepaliveHeartbeatReceiver$MulticastReceiverThread.run(MulticastKeepaliveHeartbeatReceiver.java:124)
八月 16, 2017 3:26:57 下午 org.apache.catalina.loader.WebappClassLoaderBase clearReferencesThreads
警告: The web application appears to have started a thread named but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
java.lang.Object.wait(Native Method)
net.sf.ehcache.distribution.MulticastKeepaliveHeartbeatSender$MulticastServerThread.run(MulticastKeepaliveHeartbeatSender.java:146)
八月 16, 2017 3:26:57 下午 org.apache.catalina.loader.WebappClassLoaderBase clearReferencesThreads 应该是下载的maven仓库有问题，删掉，重新下载试试 admin 发表于 2017-8-16 15:33 static/image/common/back.gif
应该是下载的maven仓库有问题，删掉，重新下载试试
:handshake好的多谢，我重新试试！ admin 发表于 2017-8-16 15:33 static/image/common/back.gif
应该是下载的maven仓库有问题，删掉，重新下载试试
我把本地仓库里东西删了，重新下载了一遍，还是这个问题。:'(
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