Swagger doesn't work in karaf-camel-rest-sql

2018-11-03 08:31:37,062 | INFO  | ead #2 - timer://foo | generateOrder-route              | 120 - org.apache.camel.camel-core - 2.21.0.fuse-720040 | Inserted new order 1
2018-11-03 08:31:37,547 | INFO  | rocessed%20=%20false | processOrder-route               | 120 - org.apache.camel.camel-core - 2.21.0.fuse-720040 | Processed order id 1 item ActiveMQ of 10 copies of ActiveMQ in Action
2018-11-03 08:31:45,741 | WARN  | qtp1210359820-76     | o.a.c.s.RestSwaggerProcessor     | 125 - org.apache.camel.camel-swagger-java - 2.21.0.fuse-720040 | Error rendering Swagger API due null
java.lang.NullPointerException: null
	at org.apache.camel.swagger.RestSwaggerSupport.renderResourceListing(RestSwaggerSupport.java:211) ~[?:?]
	at org.apache.camel.swagger.RestSwaggerProcessor.process(RestSwaggerProcessor.java:119) ~[?:?]
	at org.apache.camel.component.rest.RestApiProducer.process(RestApiProducer.java:36) ~[?:?]
	at org.apache.camel.util.AsyncProcessorConverterHelper$ProcessorToAsyncProcessorBridge.process(AsyncProcessorConverterHelper.java:61) ~[?:?]
	at org.apache.camel.processor.SendProcessor.process(SendProcessor.java:148) ~[?:?]
	at org.apache.camel.processor.RedeliveryErrorHandler.process(RedeliveryErrorHandler.java:548) ~[?:?]
	at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:201) ~[?:?]
	at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:201) ~[?:?]
	at org.apache.camel.processor.DelegateAsyncProcessor.process(DelegateAsyncProcessor.java:97) ~[?:?]
	at org.apache.camel.http.common.CamelServlet.doService(CamelServlet.java:214) ~[?:?]
	at org.apache.camel.http.common.CamelServlet.service(CamelServlet.java:80) ~[?:?]
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) ~[36:javax.servlet-api:3.1.0]
	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:865) ~[?:?]
	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:535) ~[?:?]
	at org.ops4j.pax.web.service.jetty.internal.HttpServiceServletHandler.doHandle(HttpServiceServletHandler.java:71) ~[?:?]
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:146) ~[?:?]
	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:548) ~[?:?]
	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132) ~[?:?]
	at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:257) ~[?:?]
	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1595) ~[?:?]
	at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:255) ~[?:?]
	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1317) ~[?:?]
	at org.ops4j.pax.web.service.jetty.internal.HttpServiceContext.doHandle(HttpServiceContext.java:293) ~[?:?]
	at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:203) ~[?:?]
	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:473) ~[?:?]
	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1564) ~[?:?]
	at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:201) ~[?:?]
	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1219) ~[?:?]
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:144) ~[?:?]
	at org.ops4j.pax.web.service.jetty.internal.JettyServerHandlerCollection.handle(JettyServerHandlerCollection.java:80) ~[?:?]
	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132) ~[?:?]
	at org.eclipse.jetty.server.Server.handle(Server.java:531) ~[?:?]
	at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:352) ~[?:?]
	at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:260) ~[?:?]
	at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:281) ~[?:?]
	at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:102) ~[?:?]
	at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:118) ~[?:?]
	at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:333) ~[94:org.eclipse.jetty.util:9.4.11.v20180605]
	at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:310) ~[94:org.eclipse.jetty.util:9.4.11.v20180605]
	at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:168) ~[94:org.eclipse.jetty.util:9.4.11.v20180605]
	at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.produce(EatWhatYouKill.java:132) ~[94:org.eclipse.jetty.util:9.4.11.v20180605]
	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:762) [94:org.eclipse.jetty.util:9.4.11.v20180605]
	at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:680) [94:org.eclipse.jetty.util:9.4.11.v20180605]
	at java.lang.Thread.run(Thread.java:748) [?:?]