IDEA compiles java and prompts that the symbol cannot be found

Problem:

This situation occurred when maintaining a new project. When the project was built, it kept reporting an error "xxx package not found", but the referenced package and referenced classes both exist.

Solution:

maven settings

First check the maven settings, do not use the default maven version:

Maven-Reimport

UTF-8

Encoding selection is set to UTF-8, do not use the default configuration:

Invalidate Caches and Restart

Restart idea and try it

Recompile

Select the module that reported the error and right-click. Click 'Build Module' and then start the project again. There is no error message anymore.

Recommended tutorial:Java tutorial

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