A family of Microsoft suites of integrated development tools for building applications for Windows, the web, mobile devices and many other platforms. Miscellaneous topics that do not fit into specific categories.
Your java-extension doesn't know your jar packages even if they lie in your project. Expected behavior is like:
Under "JAVA PROJECTS" > "Referenced Libraries", there are jar packages (ignore gurobi-12.0.1.jar, that is my personal-purpose jar).
Conventionally, java-extension (actually extension "Project Manager for Java") know where your jar packages are by folder name "lib", so try rename your "test-lib" to "lib". If it doesn't work, you can manage the dependencies by clicking the "+" icon or the "-" icon on the "Referenced Libraries" node, or you can just directly drag your jar libraries to the node "Referenced Libraries". For more information: dependencies-for-unmanaged-folder.