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>
<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：