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I have a component that sends a message to a worker service waiting back the result.
@Autowired
private RabbitTemplate rabbit;
[...]
Object response = rabbit.convertSendAndReceive("testQ", ...);
The worker service is implemented with Apache Camel rabbitmq route:
from("rabbitmq://localhost/myExchange?declare=false&routingKey=testQ&queue=testQ")
.routeId("myCamelRoute")
.process(myProcessor)
.to("log:myLog");
myProcessor handles the message and logs out the Camel Message headers:
__TypeId__=...
breadcrumbId=...
rabbitmq.CONTENT_ENCODING=UTF-8
rabbitmq.CONTENT_TYPE=application/json
rabbitmq.CORRELATIONID=7e390b6b-d30f-4f26-ba44-33fb887db0e8
rabbitmq.DELIVERY_TAG=4
rabbitmq.EXCHANGE_NAME=
rabbitmq.PRIORITY=0
rabbitmq.REPLY_TO=amq.rabbitmq.reply-to.g2dkABNyYWJiaXRAOWU5ZjkxNDI4ZWRiAAAJgwAAADUC.5+kPXXxaXhoYo7A4T0HSZQ==
rabbitmq.ROUTING_KEY=testQ
The message header apparently contains rabbitmq.CONTENT_TYPE=application/json on the worker side but this info seems to get "lost" when the response message goes back:
o.s.a.s.c.Jackson2JsonMessageConverter : Could not convert incoming message with content-type [null]
Any idea what is wrong here?
241
I've seen the same error using the RabbitMQ Management console when using a Headers field. Passing "content_type":"application/json" as a message Property worked fine.
65
EDIT: Actually, it seems that chrome autocomplete is not working properly. I manually typed the property and worked fine too
I faced the same issue. It seems to be a problem between RabbitMQ Management console and the Spring consumer.
Based on this, I override the fromMessage method from Jackson2JsonMessageConverter, and forced the contentType to be application/json, and worked fine
My stack was:
import org.springframework.amqp.core.Message;
import org.springframework.amqp.support.converter.Jackson2JsonMessageConverter;
public class JacksonMessageConverter extends Jackson2JsonMessageConverter {
public JacksonMessageConverter() {
super();
}
@Override
public Object fromMessage(Message message) {
message.getMessageProperties().setContentType("application/json");
return super.fromMessage(message);
}
}and then I used in my rabbit configuration
@Bean
public MessageConverter messageConverter() {
JacksonMessageConverter jsonMessageConverter = new JacksonMessageConverter();
jsonMessageConverter.setClassMapper(classMapper());
return jsonMessageConverter;
}
Other solution was to create a basic application in GO to publish the message, add the content-type and it worked fine, since the problems appears to be in RabbitMQ Management console.
My script in go:
// MqFactory - Creates a connection with mq
func MqFactory() *amqp.Connection {
mqURI, err := amqp.ParseURI(createAmqpURI())
if err != nil {
fmt.Printf("Failed on parse mq uri: %s", err)
}
conn, err := amqp.Dial(mqURI.String())
if err != nil {
failOnError(err, "Failed to connect to MQ")
} else {
fmt.Println("Connection established with MQ")
}
sendMessage(conn)
return conn
}
func sendMessage(conn *amqp.Connection) {
channel, err := conn.Channel()
if err != nil {
failOnError(err, "Failed 1")
}
err2 := channel.Publish(
"<exchange>",
"<routin_key>",
false,
false,
amqp.Publishing{
Headers: amqp.Table{
"__TypeId__": "<type_id>", // If needed
},
ContentType: "application/json",
Body: []byte("<body>"),
},
)
if err2 != nil {
failOnError(err2, "Failed 2")
}
}
func createAmqpURI() string {
host := os.Getenv("MQ_HOST")
port := os.Getenv("MQ_PORT")
usr := os.Getenv("MQ_USR")
pwd := os.Getenv("MQ_PWD")
return "amqp://" + usr + ":" + pwd + "@" + host + ":" + port
}
func failOnError(err error, msg string) {
println(msg)
if err != nil {
fmt.Printf("%s: %s", msg, err)
}
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