Newbie Error? Unresolvable JacksonAnnotation(s)

[clou...@gmail.com]

Hi there!

I have a project that uses GWT-RPC and I thought I'd look into swapping over to our REST services that are available, but currently not being used.  Unfortunately, I seem to be having trouble getting my project to compile with resty-gwt.  I recently upgraded to GWT 2.8.1 and am developing in Eclipse.

First I updated the dependencies to pull down the requisite jars (Ivy.xml):

        <!-- Resty GWT -->
        <dependency org="org.fusesource.restygwt" name="restygwt" rev="2.2.0" transitive="true" conf="*->*" />

Next, the appropriate entries in the gwt.xml file:

    <!-- Resty GWT -->
    <inherits name="org.fusesource.restygwt.RestyGWT"/>
    <inherits name="com.github.nmorel.gwtjackson.GwtJackson" />
    <set-property name="restygwt.encodeDecode.useGwtJackson" value="true" />

Next, a simple service:

import javax.ws.rs.GET;

import org.fusesource.restygwt.client.MethodCallback;
import org.fusesource.restygwt.client.RestService;

public interface MyService extends RestService {
    @GET
    public void getHelloWorld(MethodCallback<String> callback);
}

Then on to creating the service object:

Resource resource = new Resource(GWT.getModuleBaseURL());
MyService cmfS = GWT.create(ConfigurationManagementService.class);
((RestServiceProxy)cmfS).setResource(resource);

The Resource URL won't be correct, but just trying to compile at this point.

When I start up Super Dev Mode I get numerous warnings in the form of:

   Resolving com.fasterxml.jackson.annotation.JacksonAnnotationsInside
      Found type 'com.fasterxml.jackson.annotation.JacksonAnnotationsInside'
         [WARN] Ignoring unresolvable annotation type com.fasterxml.jackson.annotation.JacksonAnnotation

And compilation fails similarly:

snip
Caused by: java.lang.NoClassDefFoundError: com/fasterxml/jackson/annotation/JacksonAnnotationsInside
snip
Caused by: java.lang.ClassNotFoundException: com.fasterxml.jackson.annotation.JacksonAnnotationsInside

I'm guessing this would be a relatively simple problem to address, however the solution escapes me and I seem to be stuck unable to even get a fairly simple use of resty-gwt to compile.  Is there something simple I am missing here?

Thanks for any insights!

[Ali Jalal]

Hi,

It seems that you do not have jackson-annotations-*.jar in project classpath (or SuperDevMode classpath). Please make sure that necessary jars added to the classpath.

Regards,

Ali

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[clou...@gmail.com]

Oddly enough, the various jackson-*.jars were present, with a single exception.  While jackson-annotations-2.7.2-sources.jar was present, jackson-annotations-2.7.2.jar was not, thus the compilation error.  I had to specifically pull that jar down as such.

Ivy.xml

        <!-- Resty GWT -->
        <dependency org="org.fusesource.restygwt" name="restygwt" rev="2.2.0" transitive="true" conf="*->

*" />
        <dependency org="com.fasterxml.jackson.core" name="jackson-annotations" rev="2.7.2" conf="*->*">
            <artifact name="jackson-annotations" />
        </dependency>

Odd situation, but there it is if anyone else encounters the same problem.

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