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[I got it, the tag should be modified to "jar". Fixed!]

I've tried this on both ubuntu and mac, doesn't work. I've Apache Maven 3.5.2 and jdk 1.8

(1) create a directory called mytest and enter:

mkdir mytest
cd mytest

(2) create folder structure of src/main/java

mkdir -p src/main/java

(3) create pom file:

<?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.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 <modelVersion>4.0.0</modelVersion>

 <groupId>org.mytest</groupId>
 <artifactId>mytest</artifactId>
 <packaging>pom</packaging>
 <version>1.0-SNAPSHOT</version>
</project>

and a java file of "./src/main/java/m.java"

public class m
 public static void main(String args)
 System.out.println("hw");
 
 

(4) Now the structure is like:

.
./src
./src/main
./src/main/java
./src/main/java/m.java
./pom.xml

(5) mvn clean compile:

$ mvn clean compile
[INFO] Scanning for projects...
[INFO] 
[INFO] ------------------------------------------------------------------------
[INFO] Building mytest 1.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO] 
[INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ mytest ---
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 0.271 s
[INFO] Finished at: 2018-11-10T01:19:27-08:00
[INFO] Final Memory: 7M/188M
[INFO] ------------------------------------------------------------------------

From the screen print, no compilation is done. Check directory of "target", no class file generated.

Why this? I hope that when I have standard folder structure of src/main/java, then maven should automatically try to find the .java file and compile it into target/ folder right?

Did I miss anything?