August 14, 2022

Illegal to inject a message body into a singleton into public org.codehaus.jackson.jaxrs.JacksonJsonProvider

Using Jackson as JSON provider in RESTEasy. With RESTEasy auto scanning enabled. When starting up, it hits following errors and failed to start up any of the RESTEasy services: Illegal to inject a message body into a singleton into public org.codehaus.jackson.jaxrs.JacksonJsonProvider

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JSON example with RESTEasy + Jackson

Many like Jackson JSON processor, and it supported in RESTEasy. In this tutorial, we show you how to convert an object to JSON format and return it back to the client. To integrate Jackson with RESTEasy, you just need to include “resteasy-jackson-provider.jar“. When RESTEasy returned a json output, it will use Jackson provider to convert it automatically. You do not need to code a single line to integrate both.

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