SimpleREST return "Internal Server Error"

[relucant1]

i can run the SimpleREST's main method ,but when i call /products in chrome ,the api return "Internal Server Error" with http code 500 and show nothing in my ide console.please tell me some.thanks

[tsegismont]

I can't reproduce. Do you have anything in the server logs?

[relucant1]

I can't reproduce. Do you have anything in the server logs?

nothing in server logs. i thought the server maybe not receive the request. but the httpcode is 500. it's so strange .i thought maybe there is something wrong in the request header.i'm trying to make the server
available. appreciate any suggest very much.

[tsegismont]

Weird. Can you add this to the router definition and try again:

    router.errorHandler(500, rc -> {
      System.err.println("Handling failure");
      Throwable failure = rc.failure();
      if (failure != null) {
        failure.printStackTrace();
      }
    });

[onemsg]

The reson is

java.lang.NoSuchMethodError: com.fasterxml.jackson.core.JsonGenerator.writeStartObject(Ljava/lang/Object;)V
        at com.fasterxml.jackson.databind.ser.std.MapSerializer.serialize(MapSerializer.java:630)
        at com.fasterxml.jackson.databind.ser.std.MapSerializer.serialize(MapSerializer.java:33)
        at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider._serialize(DefaultSerializerProvider.java:480)
        at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.java:319)
        at com.fasterxml.jackson.databind.ObjectMapper.writeValue(ObjectMapper.java:2656)
        at com.fasterxml.jackson.core.base.GeneratorBase.writeObject(GeneratorBase.java:355)
        at io.vertx.core.json.JsonObjectSerializer.serialize(JsonObjectSerializer.java:22)
        at io.vertx.core.json.JsonObjectSerializer.serialize(JsonObjectSerializer.java:19)
        at com.fasterxml.jackson.databind.ser.impl.IndexedListSerializer.serializeContents(IndexedListSerializer.java:119)
        at com.fasterxml.jackson.databind.ser.impl.IndexedListSerializer.serialize(IndexedListSerializer.java:79)
        at com.fasterxml.jackson.databind.ser.impl.IndexedListSerializer.serialize(IndexedListSerializer.java:18)
        at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider._serialize(DefaultSerializerProvider.java:480)
        at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.java:319)
        at com.fasterxml.jackson.databind.ObjectMapper._configAndWriteValue(ObjectMapper.java:3906)
        at com.fasterxml.jackson.databind.ObjectMapper.writeValueAsString(ObjectMapper.java:3220)
        at io.vertx.core.json.jackson.JacksonCodec.toString(JacksonCodec.java:152)
        at io.vertx.core.json.JsonArray.encodePrettily(JsonArray.java:759)
        at web.Server.handleListProducts(Server.java:78)
        at io.vertx.ext.web.impl.RouteState.handleContext(RouteState.java:1034)
        at io.vertx.ext.web.impl.RoutingContextImplBase.iterateNext(RoutingContextImplBase.java:131)
        at io.vertx.ext.web.impl.RoutingContextImpl.next(RoutingContextImpl.java:130)
        at io.vertx.ext.web.impl.RouterImpl.handle(RouterImpl.java:54)
        at io.vertx.ext.web.impl.RouterImpl.handle(RouterImpl.java:36)
        at io.vertx.core.http.impl.WebSocketRequestHandler.handle(WebSocketRequestHandler.java:50)
        at io.vertx.core.http.impl.WebSocketRequestHandler.handle(WebSocketRequestHandler.java:32)
        at io.vertx.core.http.impl.Http1xServerConnection.handleMessage(Http1xServerConnection.java:136)
        at io.vertx.core.impl.ContextImpl.executeTask(ContextImpl.java:369)
        at io.vertx.core.impl.EventLoopContext.execute(EventLoopContext.java:43)
        at io.vertx.core.impl.ContextImpl.executeFromIO(ContextImpl.java:232)
        at io.vertx.core.net.impl.VertxHandler.channelRead(VertxHandler.java:173)
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374)
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360)
       ... 
       ...

I add this , and it works.

      <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-core</artifactId>
            <version>2.10.1</version>
      </dependency>