Eclipse won't launch because `reload maven project has encountered a p‌r‌o‌b‌l‌e‌m`

Question

When I try to start Eclipse Luna in CentOS 7, I get the following dialog box:

Answer 1

I removed .metada from workspace and reimported the maven projects as quick and dirty solution. You loose your Eclipse settings, you can try to play with metadata.

Answer 2

For me it was enough just to remove the whole <persistedState /> tag in

<workspace folder>/.metadata/.plugins/org.eclipse.e4.workbench/workbench.xmi

Answer 3

Instead of deleting the whole .metadata folder, just delete the file .metadata/.plugins/org.eclipse.e4.workbench/workbench.xmi" You need to make sure to quit eclipse first, then remove this file and start eclipse again.

Error will be gone.