Avoid multiple warnings related to jackson-module-kotlin in Jackson2ObjectMapperBuilder [SPR-16497]

[spring-issuemaster]

Rossen Stoyanchev opened SPR-16497 and commented

The following message appears repeatedly:

16:21:15.415 [main] WARN  org.springframework.http.converter.json.Jackson2ObjectMapperBuilder - For Jackson Kotlin classes support please add "com.fasterxml.jackson.module:jackson-module-kotlin" to the classpath

It seems we would be able to do some detection on startup and report only once, at least per Jackson2ObjectMapperBuilder initialization.

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Affects: 5.0.3

Issue Links:

• #20217 Log a warning in Jackson builder when Kotlin is used without jackson-module-kotlin

Referenced from: commits 7baf33f

[mauhiz]

For people who reach this page wondering how to silence the warn:

  @Bean
  fun configureJackson2() = Jackson2ObjectMapperBuilderCustomizer { it.findModulesViaServiceLoader(true) }