Dynamic Web Module 3.0 requires Java 1.6 or newer

One or more constraints have not been satisfied.

解决方案 在pom.xml中添加

<build>  
    <plugins>  
        <!-- define the project compile level -->  
        <plugin>  
            <groupId>org.apache.maven.plugins</groupId>  
            <artifactId>maven-compiler-plugin</artifactId>  
            <version>2.3.2</version>  
            <configuration>  
                <source>1.8</source>  
                <target>1.8</target>  
            </configuration>  
        </plugin>  
    </plugins>  
</build> 

添加完之后右键项目-->Maven-->Update Project