Reference other unmanaged folders as dependencies

[provide a description of the issue]

Environment

• Operating System: ANY
• JDK version: 11
• Visual Studio Code version: 1.74.2
• Java extension version: Any

Steps To Reproduce

1. Create a javaproject 0, a package and a class
2. Create other project 1 a package and a class where you use class of project 0.

Suppose I have 4 independent Java projects: project0, project1, project2, and project3.

Inside each project, I have the src folder, and inside some packages and classes. Project 1, 2, and 3 use classes from project0.

In Eclipse, I can indicate in a section that the sources of project 0 are used. When I try something similar in VScode, I go to configure the classpath of project one and see that it includes its src folder. When I add the src folder of project0, I get the following error: "The source path must be contained in the project root folder."

I can solve this by creating the .jar of project 0 and adding it to the other projects, but this is very inconvenient when making quick tests.

I know there are tools like Maven or Ant to do these things, but I would like to know if there is any way to indicate in vscode that one project uses classes from another without having to include the .jar as a dependency.

Es werden keine Quelldateien, Tests oder Einstiegspunkte genannt. Beginne damit, das Setup mit vier Projekten zu reproduzieren, und verfolge die Classpath-Konfiguration der Java-Erweiterung, insbesondere die Validierung des Source-Pfads. Als erledigt gilt die Aufgabe, wenn project1, project2 und project3 auf die nicht verwalteten Quellen von project0 verweisen können, ohne ein JAR zu erstellen oder den Fehler bezüglich des Projektstamms auszulösen.