Maven jdk.1.7

settings.xml

<profile>
 <id>jdk17</id>
 <activation>
  <activeByDefault>true</activeByDefault>
  <jdk>1.7</jdk>
 </activation>
 <properties>
  <maven.compiler.source>1.7</maven.compiler.source>
  <maven.compiler.target>1.7</maven.compiler.target>
  <maven.compiler.compilerVersion>1.7</maven.compiler.compilerVersion>
 </properties> 
</profile>

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pom.xml

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-compiler-plugin</artifactId>
    <version>3.1</version>
    <configuration>
     <source>1.7</source>
     <target>1.7</target>
    </configuration>
   </plugin>