Revise generic type handling in GsonHttpMessageConverter [SPR-15381]

[spring-projects-issues]

Juergen Hoeller opened SPR-15381 and commented

In the course of #19490, it turns out that GsonHttpMessageConverter should be sharing AbstractJackson2HttpMessageConverter's recently revised generic type handling, also shared by the new JsonbHttpMessageConverter.

The full extent of this is only really feasible in 5.0, but in particular deprecations of getTypeToken and co should be backported to 4.3.8 as well.

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Issue Links:

• Subclass-resolved generic return type declarations for handler methods [SPR-16877] #21416 Subclass-resolved generic return type declarations for handler methods ("is duplicated by")
• Support for JSON Binding API (JSON-B) [SPR-14923] #19490 Support for JSON Binding API (JSON-B)
• Revise AbstractJackson2HttpMessageConverter's generic type adaptation [SPR-13728] #18301 Revise AbstractJackson2HttpMessageConverter's generic type adaptation

Referenced from: commits 3c8fc46, e5fdd4c

[spring-projects-issues]

Juergen Hoeller commented

There's also the same generic type resolution algorithm in Jackson2CodecSupport in our new reactive codec abstraction. This needs to be unified and reused as far as possible.