Java 11. javac/ warning: [options] module name in --add-reads option not found: moduleB

Question

I have a small java 11 module project, which consists of two modules moduleA and modules.

moduleB MyService.java

package com.company.packageB;
public class MyService {
    public String getHelloWorld(){
        return "Hello world!";
    }
}

module-info.java

module moduleB {}

moduleA module-info.java

module moduleA {}

Main.java

package com.company.packageA;   
import com.company.packageB.MyService;
    public class Main {
        public static void main(String[] args) {
            MyService myService = new MyService();
            String s = myService.getHelloWorld();
            System.out.println(s);
        }
    }

I'd like to run this project. I compile moduleB with this command

javac -d out/moduleB $(find ./moduleB -name "*.java")

and then I'd like to compile moduleA,

javac -p out/moduleB --add-reads moduleA=moduleB --add-exports moduleB/com.company.packageB=moduleA  -d out/moduleA   $(find ./moduleA -name "*.java")

but I run into the issue:

warning: module name in --add-reads option not found: moduleB
warning: [options] module name in --add-exports option not found: moduleB
./moduleA/src/com/company/packageA/Main.java:3: error: package com.company.packageB does not exist
import com.company.packageB.MyService;
                           ^
./moduleA/src/com/company/packageA/Main.java:7: error: cannot find symbol
        MyService myService = new MyService();
        ^
  symbol:   class MyService
  location: class Main

How can I compile moduleA with --add-export and --add-reads options?

I think you only need to tag your question with the actual java version you are using. Are you really using versions 9, 10 and 11 ? — Abra
– Abra, Commented Apr 29, 2020 at 12:56
If to specify export MAVEN_OPTS="--add-reads demo=ALL-UNNAMED" then WARNING: Unknown module: specified to --add-reads. — Oleksii Kyslytsyn
– Oleksii Kyslytsyn, Commented Nov 27, 2024 at 15:14

Naman · Accepted Answer · 2020-04-29 15:52:29Z

2

You should export the package before trying to use the classes from within it in another module.

So, at first the moduleB should export the package as:

module moduleB {
     exports com.company.packageB;
}

and then the other module moduleA should require the moduleB -

module moduleA {
     requires moduleB;
}

answered Apr 29, 2020 at 15:52

Naman

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