[CAMEL-15841] logging empties message body?

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Invalid
• Affects Version/s: 3.5.0
• Component/s: camel-core

Environment

my project is attached

• Estimated Complexity: Unknown
• Assignee: Unassigned
• Reporter: Vyacheslav Boyko
• Created: 10/Nov/20 19:18
• Updated: 10/Nov/20 19:21
• Resolved: 10/Nov/20 19:20

Description

my build.gradle is

plugins {
	id 'org.springframework.boot' version '2.3.5.RELEASE'
	id 'io.spring.dependency-management' version '1.0.10.RELEASE'
	id 'java'
}

group = 'com.bvn13'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = '11'

configurations {
	compileOnly {
		extendsFrom annotationProcessor
	}
}

repositories {
	mavenCentral()
}

dependencies {
	//implementation 'org.springframework.boot:spring-boot-starter-thymeleaf'
	//implementation 'org.springframework.boot:spring-boot-starter-web'
	implementation 'org.apache.camel.springboot:camel-spring-boot-starter:3.5.0'
	implementation 'org.apache.camel:camel-http:3.5.0'
	implementation 'org.apache.camel:camel-jetty:3.5.0'
	implementation 'org.apache.camel:camel-gson:3.5.0'
	
	compileOnly 'org.projectlombok:lombok'
	annotationProcessor 'org.projectlombok:lombok'
	testImplementation('org.springframework.boot:spring-boot-starter-test') {
		exclude group: 'org.junit.vintage', module: 'junit-vintage-engine'
	}
}

test {
	useJUnitPlatform()
}

my route builder is:

import org.apache.camel.builder.RouteBuilder;
import org.apache.camel.model.dataformat.JsonLibrary;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

import lombok.extern.slf4j.Slf4j;

@Slf4j
@Component
public class EgaisExpirationDateSearcher extends RouteBuilder {

    private final String host;
    private final int port;
    
    private final String searchEndpoint;

    public EgaisExpirationDateSearcher(
            @Value("${app.listen.host}") String host,
            @Value("${app.listen.port}") int port) {
        this.host = host;
        this.port = port;
        searchEndpoint = "jetty:http://"+host+":"+port+"/expire";
        
        log.info("Listening at: {}", searchEndpoint);
    }

    @Override
    public void configure() throws Exception {
        
        from(searchEndpoint+"?httpMethodRestrict=POST")
            .log("${body}")  // <-----------------
            .unmarshal().json(JsonLibrary.Gson, SearchRequest.class)
            .log("${body}")
            .process((exchange) -> {
                exchange.getMessage().setBody("HI!");
            })
            ;
        
        
    }

}

my application properties are:

app:
  listen:
    host: localhost
    port: 9091

I have an object as request body:

import lombok.Value;

@Value
public class SearchRequest {
    String contraInn;
    String alcoGoodName;
}

I perform POST HTTP request like

curl -X POST -H "Content-Type: application/json" -d '{"contraInn":123,"alcoGoodName":"name"}' http://localhost:9091/expire

now take a look at pointed line in route builder:

.log("${body}")  // <-----------------

if I comment this line (disable logging) the log has following lines:

2020-11-10 22:07:52.172  INFO 1344 --- [           main] c.b.b.e.EgaisConnectorApplication        : Started EgaisConnectorApplication in 2.003 seconds (JVM running for 2.982)
2020-11-10 22:11:05.575  INFO 1344 --- [tp1753113235-31] route2                                   : com.bvn13.beerspot.egaisconnector.SearchRequest@2d34001a

but when I uncomment pointed line the body seems become empty right after logging:

2020-11-10 22:12:40.284  INFO 10924 --- [           main] c.b.b.e.EgaisConnectorApplication        : Started EgaisConnectorApplication in 1.932 seconds (JVM running for 2.78)
2020-11-10 22:12:46.854  INFO 10924 --- [qtp216919586-31] route2                                   : {"contraInn":123,"alcoGoodName":"name"}
2020-11-10 22:12:46.857  INFO 10924 --- [qtp216919586-31] route2                                   : null

First log message is logged as arrived, then emptied , unmarshalled to null and logged out as null.

Is it normal?