The temporary upload location [/tmp/tomcat.3056330638826298336.18601/work/Tomcat/localhost/ROOT] is

org.springframework.web.multipart.MultipartException: Could not parse multipart servlet request;nested exception is java.io.IOException: The temporary upload location [/tmp/tomcat.3056330638826298336.18601/work/Tomcat/localhost/ROOT] is not valid 

解决办法：

1. 临时的，直接重新启动项目就行，会重新建立临时文件夹 /tmp/tomcat.3056330638826298336.18601/work/Tomcat/localhost/ROOT

2. 在配置文件中配置tomcat的临时目录：server.tomcat.basedir=/home/tmp

3. 写一个配置类

    @Bean
   	 MultipartConfigElement multipartConfigElement() {
   	    MultipartConfigFactory factory = new MultipartConfigFactory();
   	    factory.setLocation("/home/tmp");
   	    return factory.createMultipartConfig();
   	}