Maven tab problems - missing projects
已回答
Following recommendations for migrating my Eclipse workspace to IntelliJ IDEA I created a single project and one module for each of 5 of my original Eclipse projects.
All was going fine until I looked at the Maven tab a moment ago... and found that two of my projects are missing and there is a "null" project listed there too. How do I fix it?
(in case it is relevant: bom-pom-master only holds the parent POM for all of the others, core-lib is a library imported as a dependency by all projects, core-services is a standalone spring boot app, rest-db-common-api contains pojos, rest-db-common is a REST app deployable as a WAR to Tomcat and relies on everything else, the client app... I didn't even get to before this problem happened).

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Please report at https://youtrack.jetbrains.com/newIssue?project=IDEA. Attach a small sample project to reproduce the issue and the logs using Help | Collect Logs and Diagnostic Data.
LOL, I wish I knew how to reproduce the issue. It was fine until added rest-db-common. That is when everything broke. Logs and Diagnostic data I can collect.
I was hoping this would be a simple and common issue. Will report it.
EDIT: Never mind... simply closing and restarting IntelliJ IDEA fixed the problem.
You can try to delete .idea directory and reimport the project from pom.xml: https://www.jetbrains.com/help/idea/maven-support.html#maven_import_project_start as a general troubleshooting step.