Package name not recognized when opening standalone java files

[fbricon]

If you open a folder containing src/mypackage/Foo.java, with

package mypackage;

public class Foo {}

You end up with The declared package "mypackage" does not match the expected package ""

See attached project

[rgrunber]

For a source file placed under mypackge.yourpackage correctly, the classpath entry for the sources is incorrectly defined as _/src/mypackage/yourpackage (as opposed to just _/src). After a restart, it seems to get it right, and I'm also seeing the behaviour where a second restart seems to eliminate the source entry entirely.

InvisibleProjectImporter is probably a good starting point.

[snjeza]

The issue has been introduced by #1658
A workaround is to add

"java.project.sourcePaths": [
    "src"
],

to .vscode/settings.json

[rgrunber]

It probably makes sense to add "src" to that list, if it's empty to avoid regressions with clients who don't set this property.