maven build java project, jdk version problem

Use maven to build Java projects, the default jdk version is 1.5

For details, see the official description: https://maven.apache.org/plugins/maven-compiler-plugin/compile-mojo.html

source	String	2.0	The -source argument for the Java compiler. Default value is: 1.5. User property is: maven.compiler.source.
target	String	2.1	The -encoding argument for the Java compiler. Default value is: ${project.build.sourceEncoding}. User property is: encoding.
encoding	String	2.0	The -target argument for the Java compiler. Default value is: 1.5. User property is: maven.compiler.target.

If you want to specify the jdk version, there are two ways

The first way: specify in maven's settings.xml

<profiles>      
    <profile>  
        <id>JDK1.7</id>  
        <activation>  
            <activeByDefault>true</activeByDefault>  
        </activation>  
        <properties>  
            <maven.compiler.source>1.7</maven.compiler.source>  
            <maven.compiler.target>1.7</maven.compiler.target>  
            <encoding>UTF-8</encoding>  
        </properties>  
    </profile>  
</profiles>  

The second way: specify in the pom file in the project 

<properties>
    <maven_compiler_plugin_version>2.32</maven_compiler_plugin_version>
</properties>


<build>  
    <plugins>  
        <plugin>  
            <groupId>org.apache.maven.plugins</groupId>  
            <artifactId>maven-compiler-plugin</artifactId>  
            <version>${maven_compiler_plugin_version}</version>  
            <configuration>  
                <source>1.7</source>  
                <target>1.7</target>  
                <encoding>UTF-8</encoding>  
            </configuration>  
        </plugin>  
    </plugins>  
</build>