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com.vaadin.server.ServiceException: java.lang.NoClassDefFoundError: org/apache/commons/lang3/StringUtils
javax.servlet.ServletException: com.vaadin.server.ServiceException: java.lang.NullPointerException at com.vaadin.server.VaadinServlet.service(VaadinServlet.java:352) 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.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:748) at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:488) at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:411) at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:338) at org.apache.catalina.core.StandardHostValve.custom(StandardHostValve.java:467) at org.apache.catalina.core.StandardHostValve.status(StandardHostValve.java:338) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:203) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1070) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1736) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1695) at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Unknown Source)Caused by: com.vaadin.server.ServiceException: java.lang.NullPointerException at com.vaadin.server.VaadinService.handleExceptionDuringRequest(VaadinService.java:1466) at com.vaadin.server.VaadinService.handleRequest(VaadinService.java:1420) at com.vaadin.server.VaadinServlet.service(VaadinServlet.java:350) ... 21 moreCaused by: java.lang.NullPointerException: null at com.vaadin.server.LegacyCommunicationManager.getClientCache(LegacyCommunicationManager.java:194) at com.vaadin.server.LegacyCommunicationManager.repaintAll(LegacyCommunicationManager.java:421) at com.vaadin.server.communication.UIInitHandler.synchronizedHandleRequest(UIInitHandler.java:76) at com.vaadin.server.SynchronizedRequestHandler.handleRequest(SynchronizedRequestHandler.java:41) at com.vaadin.server.VaadinService.handleRequest(VaadinService.java:1408) ... 22 more