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javaquarkusresteasyvert.xreactive

Quarkus: The return value of "org.jboss.resteasy.reactive.server.mapping.RuntimeResource.getProduces()" is null

I created Reactive SQL client on Quarkus using this official guide, but while making GET request on http://localhost:8080/hello trying to query data from database, I get such an error:

2022-03-06 13:18:53,051 ERROR [io.qua.ver.htt.run.QuarkusErrorHandler] (vert.x-eventloop-thread-5) HTTP Request to /hello failed, error id: 2796a874-61d9-43ee-bd87-6f098cffa484-2: java.lang.NullPointerException: Cannot invoke "org.jboss.resteasy.reactive.common.util.ServerMediaType.getSortedMediaTypes()" because the return value of "org.jboss.resteasy.reactive.server.mapping.RuntimeResource.getProduces()" is null
    at org.jboss.resteasy.reactive.server.handlers.PublisherResponseHandler.handle(PublisherResponseHandler.java:203)
    at org.jboss.resteasy.reactive.server.handlers.PublisherResponseHandler.handle(PublisherResponseHandler.java:30)
    at org.jboss.resteasy.reactive.common.core.AbstractResteasyReactiveContext.run(AbstractResteasyReactiveContext.java:141)
    at org.jboss.resteasy.reactive.server.handlers.RestInitialHandler.beginProcessing(RestInitialHandler.java:49)
    at org.jboss.resteasy.reactive.server.vertx.ResteasyReactiveVertxHandler.handle(ResteasyReactiveVertxHandler.java:17)
    at org.jboss.resteasy.reactive.server.vertx.ResteasyReactiveVertxHandler.handle(ResteasyReactiveVertxHandler.java:7)
    at io.vertx.ext.web.impl.RouteState.handleContext(RouteState.java:1212)
    at io.vertx.ext.web.impl.RoutingContextImplBase.iterateNext(RoutingContextImplBase.java:163)
    at io.vertx.ext.web.impl.RoutingContextImpl.next(RoutingContextImpl.java:141)
    at io.quarkus.vertx.http.runtime.StaticResourcesRecorder$2.handle(StaticResourcesRecorder.java:67)
    at io.quarkus.vertx.http.runtime.StaticResourcesRecorder$2.handle(StaticResourcesRecorder.java:55)
    at io.vertx.ext.web.impl.RouteState.handleContext(RouteState.java:1212)
    at io.vertx.ext.web.impl.RoutingContextImplBase.iterateNext(RoutingContextImplBase.java:126)
    at io.vertx.ext.web.impl.RoutingContextImpl.next(RoutingContextImpl.java:141)
    at io.vertx.ext.web.handler.impl.StaticHandlerImpl.lambda$sendStatic$1(StaticHandlerImpl.java:274)
    at io.vertx.core.impl.future.FutureImpl$3.onSuccess(FutureImpl.java:141)
    at io.vertx.core.impl.future.FutureBase.lambda$emitSuccess$0(FutureBase.java:54)
    at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:164)
    at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:469)
    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:503)
    at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:986)
    at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
    at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
    at java.base/java.lang.Thread.run(Thread.java:833)
Solution

  • You need to add something like:

    @Produces(MediaType.APPLICATION_JSON)
// Each element will be sent as JSON
@RestSseElementType(MediaType.APPLICATION_JSON)

    to your JAX-RS method.

    However, you most likely also need to include quarkus-resteasy-reactive-jackson. Furthermore, you might want to revisit the use of Multi as a return type as you are likely looking for something like Uni<List<Address>>.