Handler processing failed; nested exception is java.lang.NoClassDefFoundError: Could not initialize

最近把项目中es 从1.7.3 升级 到 2.2.2， 遇到如下异常:

exception

org.springframework.web.util.NestedServletException: Handler processing failed; nested exception is java.lang.NoClassDefFoundError:

Could not initialize class org.elasticsearch.common.xcontent.smile.SmileXContent
org.springframework.web.servlet.DispatcherServlet.triggerAfterCompletionWithError(DispatcherServlet.java:1302)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:977)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:968)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:859)
javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:844)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
com.alibaba.druid.support.http.WebStatFilter.doFilter(WebStatFilter.java:124)
org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:61)
org.apache.shiro.web.servlet.AdviceFilter.executeChain(AdviceFilter.java:108)
org.apache.shiro.web.servlet.AdviceFilter.doFilterInternal(AdviceFilter.java:137)
org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)
org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:66)
org.apache.shiro.web.servlet.AdviceFilter.executeChain(AdviceFilter.java:108)

使用maven管理jar文件的，一直往jar包组件冲突方向上找问题，还是不得其解；

最后偶然在看到一论坛文章才知道原因， Jackson要用2.6.2
，ES 2.x版本 Jackson不能 =< 2.3 ；

maven升级jackson版本，就OK了

，参考论坛文章