[JAVA] Spring-Boot main class not found

Main class not found at runtime

When I tried to start the Spring-Boot project imported from git, the following error sometimes appeared.

** Error: Main class com.example.Hoge was not found or could not be loaded **

Cause

The causes reproduced here are as follows.

• Uploaded to git in the environment implemented by Eclipse + STS Plugin.
• Import the above as an "existing project" with STS (non-Eclipse plug-in).
• .project files are manufactured by copy and paste.

This method will result in an error that cannot be found. Also, clean build or Maven update on the imported project does not solve the problem.

Correspondence

When I imported the project from STS by the following method, it started normally.

• Right click on Package Explorer
• Select import
• Extract Maven from the Import Wizard
• Next with existing Maven project
• Select the git cloned package in the root directory

After this, it started normally (by habitually performing Maven update and clean build). For memorandum & reference.