Maven: How to run a .java file from command line passing arguments

Question

I have the following problem. I would like to run mvn from command line for a Main.java file. Main.java accepts a parameter. How do I do that from command line?

I tried finding an example but I was not successful. Could someone help me by giving me an example of that?

I looked here but didn't quite understand what I should do.

Also, how do I execute that command from a different folder than the Main.java folder?

for example the Main.java is located in my/java/program/Main.java. What should I put in

mvn exec:java -Dexec.mainClass="what to put here?" -Dexec.args="arg0 arg1 arg2" 

Answer 1

You could run: mvn exec:exec -Dexec.args="arg1".

This will pass the argument arg1 to your program.

You should specify the main class fully qualified, for example, a Main.java that is in a package test would need

mvn exec:java  -Dexec.mainClass=test.Main 

By using the -f parameter, as decribed here, you can also run it from other directories.

mvn exec:java -Dexec.mainClass=test.Main -f folder/pom.xm 

For multiple arguments, simply separate them with a space as you would at the command line.

mvn exec:java -Dexec.mainClass=test.Main -Dexec.args="arg1 arg2 arg3" 

For arguments separated with a space, you can group using 'argument separated with space' inside the quotation marks.

mvn exec:java -Dexec.mainClass=test.Main -Dexec.args="'argument separated with space' 'another one'"