struts spring integration get following error java.lang.ClassNotFoundException: org.springframework.web.struts.ContextLoaderPlugIn

In my application i used spring-struts.jar but it is throwing this error.

java.lang.ClassNotFoundException: org.springframework.web.struts.ContextLoaderPlugIn at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1714) at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1559) at org.apache.struts.util.RequestUtils.applicationClass(RequestUtils.java:207) at org.apache.struts.util.RequestUtils.applicationInstance(RequestUtils.java:231) at org.apache.struts.action.ActionServlet.initModulePlugIns(ActionServlet.java:1142) at org.apache.struts.action.ActionServlet.init(ActionServlet.java:473) at javax.servlet.GenericServlet.init(GenericServlet.java:160) at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1280) at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1193) at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1088) at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:5123) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5407) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549) at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source) at java.util.concurrent.FutureTask.run(Unknown Source) at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.lang.Thread.run(Unknown Source)