SpringBoot mapstruct-processor jar is missing when package from springboot2.4

Reproduce steps 1. new starter only contain spring-boot-web 2. add mapstruct in pom.xml 3. use org.mapstruct.ap.internal.util.Collections 4. if started by idea/eclipse: it's ok 5. when package to jar. error: java.lang.NoClassDefFoundError: org/mapstruct/ap/internal/util/Collections

java: java21 spring-boot: 3.3.2 err, 2.7.18 err, 2.4.0 err, but SpringBoot2.3.9.RELEASE ok

import org.mapstruct.ap.internal.util.Collections;

@RequestMapping
@RestController
@SpringBootApplication
public class ZzDemo01Application {

    public static void main(String[] args) {
        SpringApplication.run(ZzDemo01Application.class, args);
    }


    @GetMapping("hello")
    public Set<String> hello() {
        return Collections.asSet("a", "b");
    }
}

<!--mapstruct start-->
<dependency>
    <groupId>org.mapstruct</groupId>
    <artifactId>mapstruct-jdk8</artifactId>
    <version>1.5.5.Final</version>
</dependency>
<dependency>
    <groupId>org.mapstruct</groupId>
    <artifactId>mapstruct</artifactId>
    <version>1.5.5.Final</version>
</dependency>
<dependency>
    <groupId>org.mapstruct</groupId>
    <artifactId>mapstruct-processor</artifactId>
    <version>1.5.5.Final</version>
</dependency>

Comment From: hepengju

I cloned the code, and find from SpringBoot2.4.0: spring-boot-maven-plugin, add new JarTypeFilter exclude it. I will notify to https://github.com/mapstruct/mapstruct

Comment From: hepengju

maybe spring-boot-maven-plugin can give an option: use JarTypeFilter or not and default not.

Comment From: philwebb

The Collections is in an org.mapstruct.ap.internal package so I don't think it's intended to be used in your own code.