解决One or more constraints have not been satisfied问题

jdk版本不对

在pom文件中加入 <build>
<finalName>ssmm</finalName>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</plugin>
</plugins>
</build>