Failed to import projects because BasicFileDetector could not scan dirs

[testforstephen]

Failed to import projects
Failed to scan <REDACTED: user-file-path>
org.eclipse.core.runtime.CoreException: Failed to scan <REDACTED: user-file-path>
	at org.eclipse.jdt.ls.core.internal.managers.BasicFileDetector.scan(BasicFileDetector.java:140)
	at org.eclipse.jdt.ls.core.internal.managers.GradleProjectImporter.applies(GradleProjectImporter.java:154)
	at org.eclipse.jdt.ls.core.internal.managers.ProjectsManager.importProjects(ProjectsManager.java:151)
	at org.eclipse.jdt.ls.core.internal.managers.ProjectsManager.initializeProjects(ProjectsManager.java:114)
	at org.eclipse.jdt.ls.core.internal.handlers.InitHandler$1.runInWorkspace(InitHandler.java:260)
	at org.eclipse.core.internal.resources.InternalWorkspaceJob.run(InternalWorkspaceJob.java:43)
	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63)
Caused by: java.nio.file.NoSuchFileException: <REDACTED: user-file-path>
	at <REDACTED: user-file-path>(Unknown Source)
	at <REDACTED: user-file-path>(Unknown Source)
	at <REDACTED: user-file-path>(Unknown Source)
	at <REDACTED: user-file-path>$Basic.readAttributes(Unknown Source)
	at <REDACTED: user-file-path>$Basic.readAttributes(Unknown Source)
	at <REDACTED: user-file-path>(Unknown Source)
	at <REDACTED: user-file-path>(Unknown Source)
	at <REDACTED: user-file-path>(Unknown Source)
	at <REDACTED: user-file-path>(Unknown Source)
	at <REDACTED: user-file-path>(Unknown Source)
	at <REDACTED: user-file-path>(Unknown Source)
	at org.eclipse.jdt.ls.core.internal.managers.BasicFileDetector.scanDir(BasicFileDetector.java:178)
	at org.eclipse.jdt.ls.core.internal.managers.BasicFileDetector.scan(BasicFileDetector.java:138)
	... 6 more

Failed to import projects
Failed to scan <REDACTED: user-file-path>
org.eclipse.core.runtime.CoreException: Failed to scan <REDACTED: user-file-path>
	at org.eclipse.jdt.ls.core.internal.managers.BasicFileDetector.scan(BasicFileDetector.java:140)
	at org.eclipse.jdt.ls.core.internal.managers.GradleProjectImporter.applies(GradleProjectImporter.java:154)
	at org.eclipse.jdt.ls.core.internal.managers.ProjectsManager.importProjects(ProjectsManager.java:151)
	at org.eclipse.jdt.ls.core.internal.managers.ProjectsManager.initializeProjects(ProjectsManager.java:114)
	at org.eclipse.jdt.ls.core.internal.handlers.InitHandler$1.runInWorkspace(InitHandler.java:260)
	at org.eclipse.core.internal.resources.InternalWorkspaceJob.run(InternalWorkspaceJob.java:43)
	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63)
Caused by: java.nio.file.AccessDeniedException: <REDACTED: user-file-path>
	at <REDACTED: user-file-path>(Unknown Source)
	at <REDACTED: user-file-path>(Unknown Source)
	at <REDACTED: user-file-path>(Unknown Source)
	at <REDACTED: user-file-path>(Unknown Source)
	at <REDACTED: user-file-path>(Unknown Source)
	at <REDACTED: user-file-path>(Unknown Source)
	at <REDACTED: user-file-path>(Unknown Source)
	at <REDACTED: user-file-path>(Unknown Source)
	at org.eclipse.jdt.ls.core.internal.managers.BasicFileDetector.scanDir(BasicFileDetector.java:178)
	at org.eclipse.jdt.ls.core.internal.managers.BasicFileDetector.scan(BasicFileDetector.java:138)
	... 6 more

Failed to import projects
Failed to scan <REDACTED: user-file-path>
org.eclipse.core.runtime.CoreException: Failed to scan <REDACTED: user-file-path>
	at org.eclipse.jdt.ls.core.internal.managers.BasicFileDetector.scan(BasicFileDetector.java:140)
	at org.eclipse.jdt.ls.core.internal.managers.GradleProjectImporter.applies(GradleProjectImporter.java:154)
	at org.eclipse.jdt.ls.core.internal.managers.ProjectsManager.importProjects(ProjectsManager.java:151)
	at org.eclipse.jdt.ls.core.internal.managers.ProjectsManager.initializeProjects(ProjectsManager.java:114)
	at org.eclipse.jdt.ls.core.internal.handlers.InitHandler$1.runInWorkspace(InitHandler.java:260)
	at org.eclipse.core.internal.resources.InternalWorkspaceJob.run(InternalWorkspaceJob.java:43)
	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63)
Caused by: java.nio.file.FileSystemException: <REDACTED: user-file-path> <file>: Operation not permitted
	at <REDACTED: user-file-path>(Unknown Source)
	at <REDACTED: user-file-path>(Unknown Source)
	at <REDACTED: user-file-path>(Unknown Source)
	at <REDACTED: user-file-path>(Unknown Source)
	at <REDACTED: user-file-path>(Unknown Source)
	at <REDACTED: user-file-path>(Unknown Source)
	at <REDACTED: user-file-path>(Unknown Source)
	at <REDACTED: user-file-path>(Unknown Source)
	at org.eclipse.jdt.ls.core.internal.managers.BasicFileDetector.scanDir(BasicFileDetector.java:178)
	at org.eclipse.jdt.ls.core.internal.managers.BasicFileDetector.scan(BasicFileDetector.java:138)
	... 6 more

[jdneo]

One related issue: redhat-developer/vscode-java#1156

[testforstephen]

Another duplicated issue: redhat-developer/vscode-java#3137

[testforstephen]

A reproducing step is to open a user home directory in VS Code, you probably get the scan error of AccessDeniedException due to some folder inaccessible. For example, on macOS, opening the home directory in VS Code, the language server scanner will throw error "Library.photoslibrary: Operation not permitted" and abort. Meanwhile, looking at the VS Code file explorer behavior, it just doesn't list the photo library tree if permission is not allowed. So In java language server, we can follow the same strategy and ignore the disallowed directory and continue.