Java / Jersey REST client: MessageBodyReader not found

Patrik Harag, 2023-12-06

If you are using Jersey REST Client and you got an error message like this:

Exception in thread "main" org.glassfish.jersey.message.internal.MessageBodyProviderNotFoundException:
MessageBodyReader not found for media type=application/json, type=interface java.util.Map, genericType=java.util.Map<java.lang.String, java.lang.String>.
        at org.glassfish.jersey.message.internal.ReaderInterceptorExecutor$TerminalReaderInterceptor.aroundReadFrom(ReaderInterceptorExecutor.java:208)
        at org.glassfish.jersey.message.internal.ReaderInterceptorExecutor.proceed(ReaderInterceptorExecutor.java:132)
        at org.glassfish.jersey.message.internal.MessageBodyFactory.readFrom(MessageBodyFactory.java:1071)
        at org.glassfish.jersey.message.internal.InboundMessageContext.readEntity(InboundMessageContext.java:850)
        at org.glassfish.jersey.message.internal.InboundMessageContext.readEntity(InboundMessageContext.java:810)
        at org.glassfish.jersey.client.ClientResponse.readEntity(ClientResponse.java:339)
        at org.glassfish.jersey.client.InboundJaxrsResponse$2.call(InboundJaxrsResponse.java:102)
        at org.glassfish.jersey.internal.Errors.process(Errors.java:292)
        at org.glassfish.jersey.internal.Errors.process(Errors.java:274)
        at org.glassfish.jersey.internal.Errors.process(Errors.java:205)
        at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:365)
        at org.glassfish.jersey.client.InboundJaxrsResponse.runInScopeIfPossible(InboundJaxrsResponse.java:240)
        at org.glassfish.jersey.client.InboundJaxrsResponse.readEntity(InboundJaxrsResponse.java:99)

And your dependencies are fine...

You probably forgot to register the JacksonFeature:

Client client = ClientBuilder.newBuilder().register(JacksonFeature.class).build();