AllEncompassingFormHttpMessageConverter ignores JAXB XML when Jackson used for JSON [SPR-14336]

[spring-projects-issues]

Jan Zahornadsky opened SPR-14336 and commented

After changes introduced in #17894, the new conditions are causing that in a project that uses both XML (via JAXB) and JSON (via Jackson) AllEncompassingFormHttpMessageConverter no longer works correctly with XML.

Referring to the code in https://github.com/spring-projects/spring-framework/blob/master/spring-web/src/main/java/org/springframework/http/converter/support/AllEncompassingFormHttpMessageConverter.java, the condition for including Jaxb part converter should read

// instead of && !jackson2Present
if (jaxb2Present && !jackson2XmlPresent) {
	addPartConverter(new Jaxb2RootElementHttpMessageConverter());
}

---

Affects: 4.2.6

Issue Links:

• AllEncompassingFormHttpMessageConverter prioritizes Jackson 2 XML over JSON [SPR-13309] #17894 AllEncompassingFormHttpMessageConverter prioritizes Jackson 2 XML over JSON

Referenced from: commits abcfffd, d0b2fe5

Backported to: 4.2.7