# Project about ES version upgrades **URL:** \ **Category:** Elasticsearch\ **Created:** [March 26, 2018, 10:48am UTC](https://discuss.elastic.co/t/project-about-es-version-upgrades/125586 "2018-03-26T10:48:27Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![mark6688](https://avatars.discourse-cdn.com/v4/letter/m/f17d59/32.png) [@mark6688](https://discuss.elastic.co/u/mark6688)\ **Post date:** [March 26, 2018, 10:48am UTC](https://discuss.elastic.co/t/project-about-es-version-upgrades/125586/1 "2018-03-26T10:48:27Z")
I want to upgrade the project from ES2.1 to ES5.5.2, and after the jar package is replaced, the following error is encountered in the creation of client. # HTTP Status 500 - Handler dispatch failed; nested exception is java.lang.NoClassDefFoundError: org/elasticsearch/transport/Netty3Plugin * * * **type** Exception report **message** Handler dispatch failed; nested exception is java.lang.NoClassDefFoundError: org/elasticsearch/transport/Netty3Plugin **description** The server encountered an internal error that prevented it from fulfilling this request. **exception** ``` org.springframework.web.util.NestedServletException: Handler dispatch failed; nested exception is java.lang.NoClassDefFoundError: org/elasticsearch/transport/Netty3Plugin org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:982) org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:901) org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970) org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:872) javax.servlet.http.HttpServlet.service(HttpServlet.java:650) org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846) javax.servlet.http.HttpServlet.service(HttpServlet.java:731) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197) org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ``` **root cause** ``` java.lang.NoClassDefFoundError: org/elasticsearch/transport/Netty3Plugin org.elasticsearch.transport.client.PreBuiltTransportClient.(PreBuiltTransportClient.java:88) com.cdvcloud.es.common.ClientUtil.getClient(ClientUtil.java:52) com.cdvcloud.es.service.APIContentService.findIndex(APIContentService.java:47) com.cdvcloud.es.controller.APIContentController.findIndexContent(APIContentController.java:63) sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) java.lang.reflect.Method.invoke(Method.java:483) org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205) org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:133) org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:97) org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827) org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738) org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85) org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:967) org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:901) org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970) org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:872) javax.servlet.http.HttpServlet.service(HttpServlet.java:650) org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846) javax.servlet.http.HttpServlet.service(HttpServlet.java:731) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197) org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ``` **root cause** ``` java.lang.ClassNotFoundException: org.elasticsearch.transport.Netty3Plugin org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1892) org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1735) org.elasticsearch.transport.client.PreBuiltTransportClient.(PreBuiltTransportClient.java:88) com.cdvcloud.es.common.ClientUtil.getClient(ClientUtil.java:52) com.cdvcloud.es.service.APIContentService.findIndex(APIContentService.java:47) com.cdvcloud.es.controller.APIContentController.findIndexContent(APIContentController.java:63) sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) java.lang.reflect.Method.invoke(Method.java:483) org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205) org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:133) org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:97) org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827) org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738) org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85) org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:967) org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:901) org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970) org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:872) javax.servlet.http.HttpServlet.service(HttpServlet.java:650) org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846) javax.servlet.http.HttpServlet.service(HttpServlet.java:731) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197) org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ``` ---
**Author:** ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)\ **Post date:** [March 26, 2018, 12:55pm UTC](https://discuss.elastic.co/t/project-about-es-version-upgrades/125586/2 "2018-03-26T12:55:51Z")
May be share your `pom.xml`? Please format your code with markdown style or by using the `` icon. ---
**Author:** ![mark6688](https://avatars.discourse-cdn.com/v4/letter/m/f17d59/32.png) [@mark6688](https://discuss.elastic.co/u/mark6688)\ **Post date:** [March 27, 2018, 1:10am UTC](https://discuss.elastic.co/t/project-about-es-version-upgrades/125586/3 "2018-03-27T01:10:07Z")
Discuss the Elastic Stack：您好！ ``` Thank you for answering my question. My project is an ordinary java Web project , It doesn't have a pom.xml. 5.5.1 version of elasticsearch , through the ordinary java Web project , must require Maven to build related plug-ins? In fact , I changed the project into a project built by maven , and the error disappeared. 顺祝安琪 ``` 礼！ mark 2018-03-27 ---
**Author:** ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)\ **Post date:** [March 27, 2018, 3:20am UTC](https://discuss.elastic.co/t/project-about-es-version-upgrades/125586/4 "2018-03-27T03:20:19Z")
You were missing the transitive dependencies then. ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [April 24, 2018, 3:20am UTC](https://discuss.elastic.co/t/project-about-es-version-upgrades/125586/5 "2018-04-24T03:20:25Z")
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