CODEWITHSUNDEEP
jsonosgicxfkarafdosgi
medalik
medalik

Reputation: 139

Apache CXF DSOGI with JSON on Karaf

I am trying to create a RESTful web service in Karaf 4.0.8 with Apache CXF DOSGI. The service is being called but I am getting this error: No message body writer has been found for class....

Any suggestion is welcome. Thank you!!!

Component:

    @Component(immediate = true, property = {
            "service.exported.interfaces=*", 
            "service.exported.configs=org.apache.cxf.rs",
"org.apache.cxf.rs.provider=com.fasterxml.jackson.jaxrs.json.JacksonJsonProvider",
            "org.apache.cxf.rs.address=/integr" })
    public class AccountRestService implements AccountWebUserIdResource {
    ...
    }


Interface:
------------
    @GET
    @Produces({
        "application/json"
    })
    AccountWebUserIdResource.GetAccountByWebUserIdResponse getAccountByWebUserId(
@PathParam("webUserId")
        String webUserId,
        @QueryParam("sc")
        String sc,
        @QueryParam("fields")
        String fields)
        throws Exception
    ;

Entity:

@JsonInclude(JsonInclude.Include.NON_NULL)
@Generated("org.jsonschema2pojo")
@JsonPropertyOrder({
    "href",
    "crm_member_id",
    "email_address",
    "account_status"
})
public class Account {

    /**
     * 
     * (Required)
     * 
     */
    @JsonProperty("href")
    private String href;
    /**
     * 
     * (Required)
     * 
     */
    @JsonProperty("crm_member_id")
    private String crmMemberId;
    /**
     * 
     * (Required)
     * 
     */
    @JsonProperty("email_address")
    private String emailAddress;

....

Upvotes: 1

Views: 675

Answers (1)

Christian Schneider
Christian Schneider

Reputation: 19606

At least with CXF-DOSGi 2 your code probably will not work. Loading the provider from a class name is problematic in OSGi anyway as the CXF DOSGi code has no visibility of the com.fasterxml.jackson.jaxrs.json.JacksonJsonProvider class.

In CXF-DOSGi this can be done using an intent. This is more OSGi friendly as the JacksonJsonProvider is then directly used as a class and so OSGi class loading works nicely. It is also necessary to set a bus property to all to override the jacksonprovider as the spec normally would not allow this.

cxf.bus.prop.skip.default.json.provider.registration=true

The intent class looks like this:

@Component(property = "org.apache.cxf.dosgi.IntentName=jackson")
public class JacksonIntent implements Callable<List<Object>> {

    public List<Object> call() throws Exception {
        return Arrays.asList((Object)new JacksonJaxbJsonProvider());
    }

}

The intents provide a generic way to define features and other overrides for CXF without directly influencing your service class.

The intent then has to be referenced in the service using the service property service.exported.intents=jackson.

I just added a jackson example to CXF-DOSGi.

Another small obstacle is that the current cxf-jackson feature misses a bundle. See CXF-7298.

Upvotes: 1

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