每次把新项目加到tomcat跑的时候就报这个错 ,,,, 要 clean几次tomcat 有时还不管用

[ERROR] 2017-12-18 11:56:00,953 org.apache.shiro.web.env.EnvironmentLoader.initEnvironment(EnvironmentLoader.java:146) - Shiro environment initialization failed
org.apache.shiro.config.ConfigurationException: Unable to instantiate class [cn.wizzer.app.web.commons.shiro.realm.PlatformAuthorizingRealm] for object named 'shiroDbRealm'.  Please ensure you've specified the fully qualified class name correctly.
	at org.apache.shiro.config.ReflectionBuilder.createNewInstance(ReflectionBuilder.java:151)
	at org.apache.shiro.config.ReflectionBuilder.buildObjects(ReflectionBuilder.java:119)
	at org.apache.shiro.config.IniSecurityManagerFactory.buildInstances(IniSecurityManagerFactory.java:161)
	at org.apache.shiro.config.IniSecurityManagerFactory.createSecurityManager(IniSecurityManagerFactory.java:124)
	at org.apache.shiro.config.IniSecurityManagerFactory.createSecurityManager(IniSecurityManagerFactory.java:102)
	at org.apache.shiro.config.IniSecurityManagerFactory.createInstance(IniSecurityManagerFactory.java:88)
	at org.apache.shiro.config.IniSecurityManagerFactory.createInstance(IniSecurityManagerFactory.java:46)
	at org.apache.shiro.config.IniFactorySupport.createInstance(IniFactorySupport.java:123)
	at org.apache.shiro.util.AbstractFactory.getInstance(AbstractFactory.java:47)
	at org.apache.shiro.web.env.IniWebEnvironment.createWebSecurityManager(IniWebEnvironment.java:203)
	at org.apache.shiro.web.env.IniWebEnvironment.configure(IniWebEnvironment.java:99)
	at org.apache.shiro.web.env.IniWebEnvironment.init(IniWebEnvironment.java:92)
	at org.apache.shiro.util.LifecycleUtils.init(LifecycleUtils.java:45)
	at org.apache.shiro.util.LifecycleUtils.init(LifecycleUtils.java:40)
	at org.apache.shiro.web.env.EnvironmentLoader.createEnvironment(EnvironmentLoader.java:221)
	at org.apache.shiro.web.env.EnvironmentLoader.initEnvironment(EnvironmentLoader.java:133)
	at org.apache.shiro.web.env.EnvironmentLoaderListener.contextInitialized(EnvironmentLoaderListener.java:58)
	at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4853)
	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5314)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1408)
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1398)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)
Caused by: org.apache.shiro.util.UnknownClassException: Unable to load class named [cn.wizzer.app.web.commons.shiro.realm.PlatformAuthorizingRealm] from the thread context, current, or system/application ClassLoaders.  All heuristics have been exhausted.  Class could not be found.
	at org.apache.shiro.util.ClassUtils.forName(ClassUtils.java:148)
	at org.apache.shiro.util.ClassUtils.newInstance(ClassUtils.java:164)
	at org.apache.shiro.config.ReflectionBuilder.createNewInstance(ReflectionBuilder.java:144)
	... 25 more