<plugins> 
    <plugin> 
        <groupId>org.apache.maven.plugins</groupId> 
        <artifactId>maven-compiler-plugin</artifactId> 
        <version>2.3.2</version> 
        <configuration> 
            <source>1.7</source> 
            <target>1.7</target> 
            <encoding>UTF-8</encoding> 
        </configuration> 
    </plugin> 
</plugins>

<profile>    
    <id>jdk-1.8</id>    
    <activation>    
        <activeByDefault>true</activeByDefault>    
        <jdk>1.8</jdk>    
    </activation>    
    <properties>    
        <maven.compiler.source>1.8</maven.compiler.source>    
        <maven.compiler.target>1.8</maven.compiler.target>    
        <maven.compiler.compilerVersion>1.8</maven.compiler.compilerVersion>    
    </properties>    
</profile>