Cannot Resolve Symbol @SpringBootApplication - IntelliJ DEA

Question

I imported a Spring Initializr build to IntelliJ and then run it as a Spring Boot build. The build works fine and displays in the browser but I continue to receive an error about unused imports and that @SpringBootApplication cannot be resolved. I also followed these steps as well: Cannot resolve symbol SpringApplication

Anyone else has this issue.

package com.sts.kevthedev;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class KevthedevApplication {

    public static void main(String[] args) {
        SpringApplication.run(KevthedevApplication.class, args);
    }
}

Answer 1

Try it:
File -> Invalidate Caches/Restart -> Invalidate And Restart

Answer 2

Put your mouse over and press ⌥ Option + Enter, then click on Add library... (most of the cases the first option);

Otherwise:

File ▸ Invalidate Caches/Restart ▸ Invalidate And Restart

then:

Answer 3

First of all resolve all the dependency using

mvn dependency:resolve

and if still you see the error, cannot resolve @SpringBootApplication

then in pom.xml, add the version this version you can also get from https://start.spring.io/ which you would have selected while creating zip file for spring-boot project

<plugin>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-maven-plugin</artifactId>
    <version>2.5.3</version>
</plugin>

after this let the dependency to resolve by saving pom.xml and once it's resolved error will be gone

Answer 4

Error sometimes happens when wrong class mentioned as per below

Spring**Boot**Application.run(OrderServiceApplication.class);

It should be like below and as per other useful tips by others to clear the cache will also help to resolve your problem.

SpringApplication.run(OrderServiceApplication.class);