首先，windows--->show view --->markers 报：

1.JAX-RS (REST Web Services) 2.0 requires Java 1.7 or newer.SSMDemo Maven Webline 1Maven Java EE Configuration Problem

在pom.xml配置文件中加入如下语句：

        <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <executions>
                    <execution>
                        <id>default-compile</id>
                        <phase>compile</phase>
                        <goals>
                            <goal>compile</goal>
                        </goals>
                        <configuration>
                            <encoding>UTF-8</encoding>
                           <source>1.7</source>  
                           <target>1.7</target>
                        </configuration>
                    </execution>
                </executions>
         </plugin>

2. Description Resource Path Location Type Cannot change version of project facet Dynamic Web Module to 2.5.

在项目的硬盘目录中，找到.setting文件夹下的org.eclipse.wst.common.project.facet.core.xml文件，修改<installed facet="jst.web" version="2.5"/>即可。