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java.lang.NoClassDefFoundError: javax/servlet/http/HttpUpgradeHandler	at java.lang.Class.getDeclaredMethods0(Native Method)	at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)	at java.lang.Class.privateGetPublicMethods(Class.java:2902)	at java.lang.Class.getMethods(Class.java:1615)	at java.beans.Introspector.getPublicDeclaredMethods(Introspector.java:1336)	at java.beans.Introspector.getTargetMethodInfo(Introspector.java:1197)	at java.beans.Introspector.getBeanInfo(Introspector.java:426)	at java.beans.Introspector.getBeanInfo(Introspector.java:173)	at groovy.lang.MetaClassImpl$15.run(MetaClassImpl.java:3290)	at java.security.AccessController.doPrivileged(Native Method)	at groovy.lang.MetaClassImpl.addProperties(MetaClassImpl.java:3288)	at groovy.lang.MetaClassImpl.initialize(MetaClassImpl.java:3265)	at org.codehaus.groovy.reflection.ClassInfo.getMetaClassUnderLock(ClassInfo.java:254)	at org.codehaus.groovy.reflection.ClassInfo.getMetaClass(ClassInfo.java:285)	at grails.views.mvc.GenericGroovyTemplateView$HttpViewRequest.$getStaticMetaClass(GenericGroovyTemplateView.groovy)	at grails.views.mvc.GenericGroovyTemplateView$HttpViewRequest.(GenericGroovyTemplateView.groovy)	at grails.views.mvc.GenericGroovyTemplateView.prepareWritable(GenericGroovyTemplateView.groovy:96)	at grails.views.mvc.GenericGroovyTemplateView.renderMergedOutputModel(GenericGroovyTemplateView.groovy:59)	at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:303)	at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1246)	at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1029)	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:973)	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:895)	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:967)	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:858)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:620)	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:843)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)	at javax.servlet.FilterChain$doFilter.call(Unknown Source)