Vaadin 20 starter project with errors in pom.xml

What I did:

• I went to start.vaadin.com
• I selected "Vaadin 20" and "Java 16"
• I downloaded and extracted the project

When I open the project in IntelliJ IDEA, I get three errors in the pom.xml:

1. Line 19, definition of parent: Project 'org.springframework.boot:spring-boot-starter-parent:2.4.6' not found
2. Line 143, vaadin-maven-plugin for prepare-frontend build goal: Plugin 'com.vaadin:vaadin-maven-plugin:20.0.1' not found
3. Line 164, production profile with vaadin-maven-plugin: Plugin 'com.vaadin:vaadin-maven-plugin:20.0.1' not found

The Maven Central repository is configured in the pom.xml file as a repository and as a plugin repository. Using my browser I can find the vaadin-maven-plugin in version 20.0.1 in the repository: https://mvnrepository.com/artifact/com.vaadin/vaadin-maven-plugin/20.0.1

When I change the version of the vaadin-maven-plugin to 19.0.7 and the version of the spring-boot-starter-parent to 2.4.5, the errors disappear and the dependencies could be found.

I am not behind a proxy and I don't have a firewall running on my computer. I use Apache Maven 3.8.1 and AdoptOpenJDK 16.0.1.

Any ideas what I am missing?

Sorry, the problem was related to IntelliJ IDEA. The fix was really easy:

Menu "File > Invalidate Caches", select "Clear file system cache and Local History" and "Clear downloaded shared indexes", click on "Invalidate and Restart".

Looks like some cache or index files of IntelliJ got corrupted. Opening the project after the restart took a little bit longer because IntelliJ needs to reindex everything, but the three errors in the pom.xml are gone.

Sorry, I totally forgot about the caching of IntelliJ…