freemarker整合springMVC报错如下：
org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘freemarkerConfig‘ defined in class path resource [config/spring-mvc.xml]: Invocation of init method failed; nested exception is java.lang.NoSuchFieldError: DEFAULT_INCOMPATIBLE_IMPROVEMENTS
解决方法，把freemarker版本换成最新版就好
报错500 DEFAULT_INCOMPATIBLE_IMPROVEMENTS
原文：https://www.cnblogs.com/Sky-Raining/p/10242026.html