Spring Boot app runs through the spring-boot-maven-plugin, but not the jar

Question

I have a Spring Boot application that builds a jar successfully. However, when I run this jar, I receive an error:

mvn clean install

> java -jar target/my-app-api-0.0.local.jar

Exception in thread "main" java.lang.NoClassDefFoundError: org/springframework/boot/SpringApplication

However, I am able to run the app through the spring-boot-maven-plugin via IntelliJ maven tab or through the mvn spring-boot:run command . The plugin is included in the pom:

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

What could be a reason for this difference? I had previously received an error for not having a main method declared in the generated manifest, but added the maven-jar-plugin to specify this

Main-Class: org.springframework.boot.loader.JarLauncher
Start-Class: com.proofpoint.app.MyAppApiApplication
Spring-Boot-Version: 3.0.2
Spring-Boot-Classes: BOOT-INF/classes/
Spring-Boot-Lib: BOOT-INF/lib/
Spring-Boot-Classpath-Index: BOOT-INF/classpath.idx
Spring-Boot-Layers-Index: BOOT-INF/layers.idx

Answer 1

I'm guessing you didn't add the dependency to your POM, although I can't know without seeing it.

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
            <version>3.0.2</version>
        </dependency>