Swagger Feature throws NullPointerException if using non-default HTTP Port

Issue

• When accessing swagger /api-docs with jax-rs server configured with a non-default HTTP port (e.g http://localhost:9000/api), Swagger API throws NullPointerException.

However, we are able access api-docs if address is configured as "/api".

• Here is the configuration of jaxrs server. Exception log is attached for your reference.

  <jaxrs:server id="api-server" address="http://localhost:9000/api">
      <jaxrs:serviceBeans>
          <ref component-id="customerSvc"></ref>
      </jaxrs:serviceBeans>
      <jaxrs:features>
          <ref component-id="swaggerFeature"></ref>
      </jaxrs:features>
      <jaxrs:providers>
          <ref component-id="cors-filter"></ref>
          <bean class="com.fasterxml.jackson.jaxrs.json.JacksonJsonProvider"></bean>
      </jaxrs:providers>
  </jaxrs:server>
  <bean id="cors-filter" class="org.apache.cxf.rs.security.cors.CrossOriginResourceSharingFilter"></bean>
  <bean id="customerSvc" class="com.redhat.CustomerService"></bean>