How to auto configure MultipartConfigElement?

[mayur9991]

Spring Boot includes MultipartAutoConfiguration, which automatically configures the MultipartConfigElement on the Spring Dispatcher Servlet.

Could you provide guidance on configuring this feature when using the Resteasy Spring Boot Starter?

[liweinan]

@mayur9991 I guess you are asking the MultipartConfigElement support in RESTEasy context. Here is how the RESTEasy uses the MultipartConfigElement:

• https://github.com/resteasy/resteasy/blob/main/resteasy-servlet-initializer/src/main/java/org/jboss/resteasy/plugins/servlet/ResteasyServletInitializer.java#L144

if (multipartConfig != null) {
            reg.setMultipartConfig(new MultipartConfigElement(multipartConfig));
}

[mayur9991]

I expected it to auto configure as spring does it with MultipartAutoConfiguration. However, that is not the case with resteasy-servlet-spring-boot-starter library.

[liweinan]

With my understanding the resteasy-spring-boot also uses the ServletInitializer internally from RESTEasy. I'll check this.

[liweinan]

I'm looking at the detail implementations between resteasy-spring-boot and resteasy and also the spring side. It may needs some time.

[liweinan]

I have checked the implementation of: https://github.com/resteasy/resteasy-spring-boot/blob/main/servlet/resteasy-servlet-spring-boot-starter/src/main/java/org/jboss/resteasy/springboot/ResteasyBeanProcessorTomcat.java

And seems it doesn't have the similar logic in:

• https://github.com/resteasy/resteasy/blob/main/resteasy-servlet-initializer/src/main/java/org/jboss/resteasy/plugins/servlet/ResteasyServletInitializer.java

        final MultipartConfig multipartConfig = applicationClass.getAnnotation(MultipartConfig.class);
        if (multipartConfig != null) {
            reg.setMultipartConfig(new MultipartConfigElement(multipartConfig));
        }

I will think about a solution on this.