_011_Maven_ configuration in Maven version of JDK

Transfer, thanks to the author's selfless sharing.

problem:

• Create a project when maven, jdk version is version 1.7, and version 1.8 is installed themselves, making it impossible to use Java8 new features such as lambda.
• Every Right project name -maven-> update project when the project will change back to jdk version 1.7 version.

Solution:

Solution one: specify jdk version in the project pom.xml

<build>  
    <plugins>  
        <plugin>  
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>  
                <version>3.1</version>  
                <configuration>  
                    <source>1.8</source>  
                    <target>1.8</target>  
                </configuration>  
            </plugin>  
        </plugins>  
</build>

This method can only guarantee that the project is jdk1.8 version, each new project had to add the above code, is not recommended, recommended the second approach.

Solution two: find maven settings.xml file in the installation directory, and add the following code inside

<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>

Note: the low version of Maven might not recognize high version of the JDK.