Error on startup: 'overlaps the location of another project'...

0.8.0, Linux 14.04

• Opening up VSCode on a folder containing the devoxx sample (https://github.com/fbricon/devoxx.git) gives me the following error:

Contains: /home/aeschli/workspaces/samples/devoxx overlaps the location of another project: 'devoxx'

• the underlying problem is that the hidden Eclipe workspace can only have a single project of a given name
• looks like I already opened some other project called 'devoxx' some time (that's possible)
• it would be good if the other location would be printed so we can find out if it's a valid conflict
• conflicts like that should not be the users concern:
  • a solution would be to always qualify all project names so they are unique
  • an other solution would be to always delete such duplicated projects (and rebuild them if they are used again later)

[Error - 11:07:12 AM] Aug 21, 2017 11:07:11 AM Problem importing to workspace
Invalid project description.
org.eclipse.core.internal.resources.ResourceException: Invalid project description.
at org.eclipse.core.internal.resources.Project.checkDescription(Project.java:169)
at org.eclipse.core.internal.resources.Project.assertCreateRequirements(Project.java:53)
at org.eclipse.core.internal.resources.Project.create(Project.java:263)
at org.eclipse.core.internal.resources.Project.create(Project.java:247)
at org.eclipse.m2e.core.internal.project.ProjectConfigurationManager.create(ProjectConfigurationManager.java:995)
at org.eclipse.m2e.core.internal.project.ProjectConfigurationManager$1.call(ProjectConfigurationManager.java:162)
at org.eclipse.m2e.core.internal.project.ProjectConfigurationManager$1.call(ProjectConfigurationManager.java:1)
at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.executeBare(MavenExecutionContext.java:177)
at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.execute(MavenExecutionContext.java:151)
at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.execute(MavenExecutionContext.java:99)
at org.eclipse.m2e.core.internal.embedder.MavenImpl.execute(MavenImpl.java:1355)
at org.eclipse.m2e.core.internal.project.ProjectConfigurationManager.importProjects(ProjectConfigurationManager.java:143)
at org.eclipse.m2e.core.internal.project.ProjectConfigurationManager.importProjects(ProjectConfigurationManager.java:133)
at org.eclipse.jdt.ls.core.internal.managers.MavenProjectImporter.importToWorkspace(MavenProjectImporter.java:117)
at org.eclipse.jdt.ls.core.internal.managers.ProjectsManager.initializeProjects(ProjectsManager.java:75)
at org.eclipse.jdt.ls.core.internal.handlers.InitHandler$1.run(InitHandler.java:117)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:56)
Contains: OK
Contains: /home/aeschli/workspaces/samples/devoxx overlaps the location of another project: 'devoxx'

報告されている Project.checkDescription の失敗を出発点として、InitHandler、ProjectsManager、MavenProjectImporter を通る起動経路を追跡します。重複するプロジェクト名がどのように処理されるかを確認し、起動時に競合の説明がないままになったり、もう一方の場所を特定せずに失敗したりしないことを検証します。