Maven项目，右键-update project后报错如下：

Description Resource Path Location Type Java compiler level does not match the version of the instal 1、DescriptionResourcePathLocationType Java compiler level does not match the version of the installed Java project facet.SSMDemo Maven WebUnknownFaceted Project Problem (Java Version Mismatch) 2、DescriptionResourcePathLocationType JAX-RS (REST Web Services) 2.0 requires Java 1.7 or newer.SSMDemo Maven Webline 1Maven Java EE Configuration Problem 3、DescriptionResourcePathLocationType One or more constraints have not been satisfied.SSMDemo Maven Webline 1Maven Java EE Configuration Problem 解决办法：在pom.xml配置文件中加入 如下元素： <!-- 配置maven项目编译插件，即jdk -->   <build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <version>3.2</version> <configuration> <source>1.7</source> <target>1.7</target> <encoding>UTF-8</encoding> </configuration> </plugin> </plugins>   </build> 详细位置如下：