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Previously the recommendation when a user wanted to use Gson was to exclude Jackson from the classpath and add Gson. This worked fine until the user also want to use the Actuator which requires Jackson. To get over this hurdle the user could leave Jackson on the classpath and perform their own HttpMessageConverter configuration and register a GsonHttpMessageConverter instead of or before any Jackson-based converter. A little complicated, but it worked. This commit makes things easier by updating the auto-configuration for HTTP message converters to prefer Gson when both Gson and Jackson are on the classpath, i.e. in the presence of both, a GsonHttpMessageConverter will be auto-configured and a MappingJackson2HttpMessageConverter won’t be. This allows an application to easily use Gson while allowing the Actuator to continue to use Jackson. Closes gh-2247 |
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