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javax.servlet.ServletException: WEB2789: Class SimpleServlet is not a Servlet	at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:893)	at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:813)	at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:3478)	at org.apache.catalina.core.StandardContext.start(StandardContext.java:3760)	at com.iplanet.ias.web.WebModule.start(WebModule.java:245)	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1133)	at org.apache.catalina.core.StandardHost.start(StandardHost.java:652)	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1133)	at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:355)	at org.apache.catalina.startup.Embedded.start(Embedded.java:995)	at com.iplanet.ias.web.WebContainer.start(WebContainer.java:429)	at com.iplanet.ias.web.WebContainer.startInstance(WebContainer.java:498)	at com.iplanet.ias.server.J2EERunner.confPostInit(J2EERunner.java:161)