项目现象如下:

这是由于你的 Maven 编译级别是 jdk太低了

解决方法:

1、在eclipse的工程上选择属性,在选择Project Facets里面中选择Dynamic web Module,将版本改成2.5

如下图:

2.在工程目录下(项目所在的那个位置) 有一个.settings文件夹(linux系统这个文件夹是隐藏的)打开org.eclipse.wst.common.project.facet.core.xml

做如下修改:

<installed facet="jst.web" version="2.5"/>

3、之后项目右健选择Maven--->Update Maven Project -->Force Update of Snaphots/Releases打勾,然后点击OK

参考链接:https://www.cnblogs.com/eaysun/p/5661631.html

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