1、 Question

This is the first time I learned Maven from the teacher of station B. because the video is previous, now I learn the knowledge of the past. First of all, we use the latest software or various packages, which leads to a version problem. This problem is really a headache.

The problem I encountered this time is: open the CMD command window to execute“`   MVN compile ` ` ` command, prompt “[error] no longer supports source option 5. Please use version 7 or later.” error message.

  2、 Cause

This is the version mismatch I just talked about. It is mainly the problem of configuration in pom.xml file

The teacher is configured as:

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="http://maven.apche.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

<modelVersion>4.0.0</modelVersion>

<groupId>com.njpowernode</groupId>
<artifactId>ch01-maven</artifactId>
<version>1.0-SNAPSHOT</version>
</project>

3、 Solution

Add the following code to the teacher’s configuration:

<properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.encoding>UTF-8</maven.compiler.encoding>
        <java.version>1.8</java.version>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
 </properties>

4、 Final result

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="http://maven.apche.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

<modelVersion>4.0.0</modelVersion>

<properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.encoding>UTF-8</maven.compiler.encoding>
        <java.version>1.8</java.version>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
 </properties>

<groupId>com.njpowernode</groupId>
<artifactId>ch01-maven</artifactId>
<version>1.0-SNAPSHOT</version>
</project>

5、 Successful execution