How to run Maven project using simple java command

Question

I know I can use mvn exec:java ... to run my Maven project. But since I want to learn more about Java, I'm trying to run my project with the java command. Here is my project structure:

pom.xml
src/
    main/java/com/company/prod/
        Obj.java
        Main.java
target/
    classes/com/company/prod/
        Obj.class
        Main.class

I'm trying to run Main by executing java -cp target/classes/com/company/prod target/classes/com/company/prod/Main. But I get java.lang.ClassNotFoundException: target.classes.com.company.prod.Main.

I also tried to cd into the target/classes/com/company/prod/ directory and run java -cp . Main but then I got Error: Could not find or load main class Main Caused by: java.lang.NoClassDefFoundError: com/company/prod/Main (wrong name: Main).

Why is this not working?

You should be using `java -cp target/classes com.company.prod.Main`. — Mark Rotteveel, Nov 20 '20 at 13:45

score 1 · Accepted Answer · answered Nov 20 '20 at 12:35

1

Use this:

java -cp target/classes com.company.prod.Main

The class path ends just before the package directories start.

answered Nov 20 '20 at 12:35

Henry

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That worked, only now, it can't find my maven dependencies. So I guess I need to add these dependencies to my classpath manually. – Sahand Nov 20 '20 at 12:39
Yes. All dependencies must be reachable via the class path. – Henry Nov 20 '20 at 12:40

score 0 · Answer 2 · answered Nov 20 '20 at 12:38

0

Mentioned Main class in POM by

<mainClass>src.main.java.org.jis.Main</mainClass>

Create executable jar file and run command java -jar your_jar_name.jar

answered Nov 20 '20 at 12:38

Vinay Katore

1
2

How to run Maven project using simple java command

2 Answers2