redhat-developer / redhat-developer/vscode-java

supposed compilation errors when using java 17 modules in visual studio code

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Description

Environment
  • Operating System: windows 11
  • JDK version: "17.0.7" 2023-04-18 LTS
  • Visual Studio Code version: 1.84.0 user setup
  • Java extension version: v.0.25.15

When I create the following code I get a compilation error saying that certain packages do not exist. The steps I followed are:

1. create a project in java in my case it is called OCP JAVA 17

2. create a folder called 12. Modules (within this folder is the directory with program codes and modules written in Java 17)

3. create a folder called feeding

4. inside the feeding folder, create a module-info.java file with the following code
module zoo.animal.feeding {
    exports zoo.animal.feeding;
}
5. inside the feeding folder, create a package or folders in the following order zoo/animal/feeding and add the Task.java file with the following code
package zoo.animal.feeding;

public class Task {
    public static void main(String... args) {
        System.out.println("All fed!");
    }
}
6. compile Task.java class and module-info.java with following command in terminal opening from 12.Modules folder
   javac -p
   mods -d
   feeding
   feeding/zoo/animal/feeding/Task.java feeding/*.java

7. create a folder called mods and run the following command in the terminal to package our compiled code from the 12.Modules folder
   jar -cvf
   mods/zoo.animal.feeding.jar -C
   feeding/ .

8. run the program by entering the following command in the terminal from 12.Modules
   java -p
   mods
   -m
   zoo.animal.feeding/zoo.animal.feeding.Task
   must be printed in console All fed!

9. create a folder called care with the following file module-info.java with the code
module zoo.animal.care {
    exports zoo.animal.care.medical; //here is vsc supposed compilation error

    requires zoo.animal.feeding;
}
10. inside the care folder create 2 packages/folders in the following order zoo/animal/care/details and zoo/animal/care/medical

11. in the zoo/animal/care/details package add the following file HippoBirthday.java
// HippoBirthday.java
package zoo.animal.care.details;

import zoo.animal.feeding.*;

public class HippoBirthday {
    private Task task;
    public static void main(String... args) { //mio
        System.out.println("Feliz cumple"); //mio
    }
}
12. in the zoo/animal/care/medical package add the following Diet.java file
// Diet.java
package zoo.animal.care.medical;

public class Diet {
    public static void main(String... args) { //mio
        System.out.println("Diet"); //mio
    }
}
13. compile and package what is inside the care folder, in the terminal from 12.Modules with the following command
    javac -p
    mods
    -d
    care
    care/zoo/animal/care/details/_.java
    care/zoo/animal/care/medical/_.java
    care/module-info.
    java

jar -cvf mods/zoo.animal.care.jar -C care/ . 14) run the classes that are inside the zoo.animal.care.medical package (which vsc says does not exist) in terminal from 12.Modules java -p mods -m zoo.animal.care/zoo.animal.care.medical.Diet the word Diet should be printed in the console

If the program runs properly, there should be no reason for vsc to mark an error in red, such as in the module-info.java file in the care folder that says that the package zoo.animal.care.medical does not exist. Your help please

attached screenshots

imagen imagen

VS Code version: Code 1.84.0 (d037ac0, 2023-11-01T11:29:04.398Z) OS version: Windows_NT x64 10.0.22621 Modes:
System Info
Extensions (15)
A/B Experiments

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Reproduce the report using the shown module-info.java, Task.java, HippoBirthday.java, and Diet.java files and the listed javac, jar, and java commands. Compare the successful terminal compilation with the red diagnostic on care/module-info.java, then trace how the Java extension handles this module layout. Done means the valid package is no longer reported as missing, or the issue has a documented explanation if the diagnostic is expected.

Written by the indexing model from the issue text.

Assessment

Tech stack
java, vscode
Domain
developer-experience, tooling
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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