Maven project is missing Maven Dependencies

　　Generally, Maven comes with Eclipse, or the Maven installed by itself does not open the service.

Solution: Right-click the Maven project -->Maven-->Enable Dependency Management

　　There may be some maven versions that do not have the option Enable Dependency Management

Solution: Add the following code to the .classpath file in the Maven project folder

　　

　　

　　<classpathentry 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>

　　Then right-click the project Maven-->Update Project.