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I recently moved from Jersey 1.X to Jersey 2.1 and using jersey-media-json-jackson for (de-)serializing to Json.

In my JUnit-Test I would like to consume a web service that return a List. With Jerey 1.x I used to work with GenericType. However, folling code does not work with Jersey 2.1 / Jackson 2.1:

GenericType<Collection<String>> listType = new GenericType<Collection<String>>() {};
assertTrue(target("location").request().get(listType).contains("item"));

it crashes with 

org.glassfish.jersey.message.internal.MessageBodyProviderNotFoundException: 
MessageBodyReader not found for media type=application/json, 
type=interface java.util.List, genericType=java.util.Collection<java.lang.String>.

Serializing is okay, since following code:

target("location").request().accept(MediaType.APPLICATION_JSON).get(String.class);

returns a valid Json String

Any ideas how to fix? Any working examples?

Versions:

    <dependency>
        <groupId>org.glassfish.jersey.core</groupId>
        <artifactId>jersey-common</artifactId>
        <version>2.1</version>
    </dependency>
    <dependency>
        <groupId>org.glassfish.jersey.core</groupId>
        <artifactId>jersey-server</artifactId>
        <version>2.1</version>
    </dependency>
    <dependency>
        <groupId>org.glassfish.jersey.containers</groupId>
        <artifactId>jersey-container-servlet</artifactId>
        <version>2.1</version>
    </dependency>
    <dependency>
        <groupId>org.glassfish.jersey.media</groupId>
        <artifactId>jersey-media-json-jackson</artifactId>
        <version>2.1</version>
    </dependency>
Johannes Staehlin
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1 Answers1

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Probably too late and you found the solution, but here it is for some else who might run into the same problem. Make sure you register the JacksonFeature on a client config before creating your client, code example below.

ClientConfig cc = new ClientConfig().register(new JacksonFeature());
Client client = ClientBuilder.newClient(cc);
WebTarget target = client.target(url);
okram123
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