You need to tell Jersey where to find the Swagger resources like this (where org.example
is your package containing services):
Map<String, String> params = Maps.newHashMap();
params.put(PackagesResourceConfig.PROPERTY_PACKAGES, "org.example;com.wordnik.swagger.jaxrs.listing");
serve("/api/v1/*").with(GuiceContainer.class, params);
Also be sure that Swagger is on your classpath. If you're using Maven add:
<dependency>
<groupId>com.wordnik</groupId>
<artifactId>swagger-jaxrs_2.9.1</artifactId>
<version>1.2.1</version>
<scope>compile</scope>
</dependency>