• Description Resource Path Location Type
  Build path specifies execution environment JavaSE-1.7. There are no JREs installed in the workspace that are strictly compatible with this environment. oto Build path JRE System Library Problem

新建maven webapp项目后出现，目前的编译环境需要的是javase 1.7,而我电脑上的是1.8,因而需要配置运行环境为1.8

解决办法：找到pom.xml中maven-compiler-plugin配置

<plugin>
          <artifactId>maven-compiler-plugin</artifactId>
          <version>3.7.0</version>
        </plugin>

修改如下：

<plugin>
          <artifactId>maven-compiler-plugin</artifactId>
          <version>3.7.0</version>
          <configuration>
            <source>1.8</source>
            <target>1.8</target>
            <encoding>UTF8</encoding>
          </configuration>
        </plugin>

• Classpath entry org.maven.eclipse.MAVEN2_CLASSPATH_CONTAINER will not be exported or published

需要将navigator视图下.classpath文件中，添加

<classpathentry exported="true" kind="con" path="org.eclipse.m2e.MAVEN2_CLASSPATH_CONTAINER">
        <attributes>
            <attribute name="maven.pomderived" value="true"/>
        </attributes>
    </classpathentry>

添加元素如下

<classpathentry exported="true" kind="con" path="org.eclipse.m2e.MAVEN2_CLASSPATH_CONTAINER">
        <attributes>
            <attribute name="maven.pomderived" value="true"/>
            <attribute name="org.eclipse.jst.component.dependency" value="/WEB-INF/lib"/>
        </attributes>
    </classpathentry>

然后右击项目 -> propertier -> java build path -> order and export 下选中 Maven，点击确定，最后clean项目即可。

mvn插件库：https://mvnrepository.com/