"IllegalArgumentException: Path must include project and resource name" when unloadable .project file is present

Java extension is not working when opening some folders (it works for soem others).
For instance when opening the folder examples of https://github.com/apache/camel-k/tree/master/examples

there is this error in output:

[Error - 3:33:47 PM] May 13, 2020 3:33:47 PM An internal error occurred during: "Initialize workspace".
Path must include project and resource name: /examples
java.lang.IllegalArgumentException: Path must include project and resource name: /examples
	at org.eclipse.core.runtime.Assert.isLegal(Assert.java:66)
	at org.eclipse.core.internal.resources.Workspace.newResource(Workspace.java:2122)
	at org.eclipse.core.internal.resources.Container.getFolder(Container.java:205)
	at org.eclipse.jdt.ls.core.internal.managers.StandardProjectsManager.registerWatchers(StandardProjectsManager.java:311)
	at org.eclipse.jdt.ls.core.internal.handlers.JDTLanguageServer$1.run(JDTLanguageServer.java:277)
	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63)

Environment

• Operating System: Fedora 31
• JDK version: Java 8
• Visual Studio Code version: 1.45.0
• Java extension version: 0.61.0

Steps To Reproduce

1. clone locally https://github.com/apache/camel-k/
2. in VS Code, File -> Open Folder...
3. select the examples folder inside the cloned repository
4. Open one of the Java files
   --> stack trace in output log
   --> several errors reported in files

[Please attach a sample project reproducing the error]

full log with trace activated:
https://gist.github.com/apupier/ca016099587a7730745d1841b094f7e6

Current Result

Expected Result

Additional Informations

it was working few weeks/months ago seems not, i tried with VS Code 1.42.1 and extension 0.55.1 and there was already the issue.

VS Code で apache/camel-k の examples フォルダーを開き、リンクされた完全なログを確認して失敗を再現します。スタックトレースの StandardProjectsManager.java:311 と JDTLanguageServer.java:277 から確認を始めます。フォルダーを開いても IllegalArgumentException や関連するファイルエラーが発生しなくなれば完了です。