ng failed; nested exception is java.lang.nullpointerexception

org.springframework.web.servlet.frameworkservlet.processrequest(frameworkservlet.java:982)

org.springframework.web.servlet.frameworkservlet.dopost(frameworkservlet.java:872)

javax.servlet.http.httpservlet.service(httpservlet.java:648)

org.springframework.web.servlet.frameworkservlet.service(frameworkservlet.java:846)

javax.servlet.http.httpservlet.service(httpservlet.java:729)

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)