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Chapter 33. Jackson

Marshal POJOs to JSON and back using Jackson

33.1. What’s inside
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Please refer to the above link for usage and configuration details.

33.2. Maven coordinates
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Create a new project with this extension on code.quarkus.redhat.com

Or add the coordinates to your existing project: 

<dependency>
    <groupId>org.apache.camel.quarkus</groupId>
    <artifactId>camel-quarkus-jackson</artifactId>
</dependency>
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33.3. Usage
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33.3.1. Configuring the Jackson ObjectMapper
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There are a few ways of configuring the ObjectMapper that the JacksonDataFormat uses. These are outlined below.

33.3.1.1. ObjectMapper created internally by JacksonDataFormat
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By default, JacksonDataFormat will create its own ObjectMapper and use the various configuration options on the DataFormat to configure additional Jackson modules, pretty printing and other features.

33.3.1.2. Custom ObjectMapper for JacksonDataFormat
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You can pass a custom ObjectMapper instance to JacksonDataFormat as follows. 

import com.fasterxml.jackson.databind.ObjectMapper;
import org.apache.camel.builder.RouteBuilder;
import org.apache.camel.component.jackson.JacksonDataFormat;

public class Routes extends RouteBuilder {
    public void configure() {
        ObjectMapper mapper = new ObjectMapper();
        JacksonDataFormat dataFormat = new JacksonDataFormat();
        dataFormat.setObjectMapper(mapper);
        // Use the dataFormat instance in a route definition
        from("direct:my-direct").marshal(dataFormat)
    }
}
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The Quarkus Jackson extension exposes an ObjectMapper CDI bean which can be discovered by the JacksonDataFormat. 

import org.apache.camel.builder.RouteBuilder;
import org.apache.camel.component.jackson.JacksonDataFormat;

public class Routes extends RouteBuilder {
    public void configure() {
        JacksonDataFormat dataFormat = new JacksonDataFormat();
        // Make JacksonDataFormat discover the Quarkus Jackson `ObjectMapper` from the Camel registry
        dataFormat.setAutoDiscoverObjectMapper(true);
        // Use the dataFormat instance in a route definition
        from("direct:my-direct").marshal(dataFormat)
    }
}
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If you are using the JSON binding mode in the Camel REST DSL and want to use the Quarkus Jackson ObjectMapper, it can be achieved as follows. 

import org.apache.camel.builder.RouteBuilder;

@ApplicationScoped
public class Routes extends RouteBuilder {
    public void configure() {
        restConfiguration().dataFormatProperty("autoDiscoverObjectMapper", "true");
        // REST definition follows...
    }
}
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You can perform customizations on the Quarkus ObjectMapper with a ObjectMapperCustomizer. 

import com.fasterxml.jackson.databind.ObjectMapper;
import io.quarkus.jackson.ObjectMapperCustomizer;

@Singleton
public class RegisterCustomModuleCustomizer implements ObjectMapperCustomizer {
    public void customize(ObjectMapper mapper) {
        mapper.registerModule(new CustomModule());
    }
}
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It’s also possible to @Inject the Quarkus ObjectMapper and pass it to the JacksonDataFormat. 

import com.fasterxml.jackson.databind.ObjectMapper;
import org.apache.camel.builder.RouteBuilder;
import org.apache.camel.component.jackson.JacksonDataFormat;

@ApplicationScoped
public class Routes extends RouteBuilder {
    @Inject
    ObjectMapper mapper;

    public void configure() {
        JacksonDataFormat dataFormat = new JacksonDataFormat();
        dataFormat.setObjectMapper(mapper);
        // Use the dataFormat instance in a route definition
        from("direct:my-direct").marshal(dataFormat)
    }
}
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