How to create RESTful Web Service with Spring Boot and Apache Camel?

Question

I'm learning Apache Camel in Spring Boot project and I try to create a Retful Webservice and the service is starting but the problem is that I get 404 when I call the endpoint.

@Component
@RequiredArgsConstructor
public class RestJavaDsl extends RouteBuilder {

    private final WeatherDataProvider weatherDataProvider;

    @Override
    public void configure() throws Exception {

        from("rest:get:javadsl/weather/{city}?produces=application/json")
                .outputType(WeatherDto.class)
                .process(this::getWeatherData);
    }

    private void getWeatherData(Exchange exchange) {
        String city = exchange.getMessage().getHeader("city", String.class);
        WeatherDto currentWeather = weatherDataProvider.getCurrentWeather(city);

        Message message = new DefaultMessage(exchange.getContext());
        message.setBody(currentWeather);
        exchange.setMessage(message);

    }

}

I created this class to hardcode some data:

@Component
public class WeatherDataProvider {

    private static Map<String, WeatherDto> weatherData = new HashMap<>();

    public WeatherDataProvider() {
        WeatherDto dto = WeatherDto.builder().city("London").temp("10").unit("C").receivedTime(new Date().toString()).id(1).build();
        weatherData.put("LONDON", dto);
    }

    public WeatherDto getCurrentWeather(String city) {
        return weatherData.get(city.toUpperCase());
    }

    public void setCurrentWeather(WeatherDto dto) {
        dto.setReceivedTime(new Date().toString());
        weatherData.put(dto.getCity().toUpperCase(), dto);
    }
}

@Data
@NoArgsConstructor
@AllArgsConstructor
@Builder
public class WeatherDto implements Serializable {
    static int counter = 1;
    private int id = counter++;
    private String city;
    private String temp;
    private String unit;
    private String receivedTime;
}

application.yml

camel:
  component:
    servlet:
      mapping:
        context-path: /services/*

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.6.3</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.dgs</groupId>
    <artifactId>camel-rest-springboot</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>camel-rest-springboot</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>11</java.version>
        <camel.version>3.14.0</camel.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.apache.camel.springboot</groupId>
            <artifactId>camel-spring-boot-starter</artifactId>
            <version>${camel.version}</version>
        </dependency>

        <dependency>
            <groupId>org.apache.camel</groupId>
            <artifactId>camel-test</artifactId>
            <scope>test</scope>
            <version>${camel.version}</version>
        </dependency>

        <dependency>
            <groupId>org.apache.camel</groupId>
            <artifactId>camel-jackson</artifactId>
            <version>${camel.version}</version>
        </dependency>

        <dependency>
            <groupId>org.apache.camel</groupId>
            <artifactId>camel-jaxb</artifactId>
            <version>${camel.version}</version>
        </dependency>

        <dependency>
            <groupId>org.apache.camel</groupId>
            <artifactId>camel-servlet</artifactId>
            <version>${camel.version}</version>
        </dependency>

        <dependency>
            <groupId>org.apache.camel.springboot</groupId>
            <artifactId>camel-servlet-starter</artifactId>
            <version>${camel.version}</version>
        </dependency>

        <dependency>
            <groupId>org.apache.camel.springboot</groupId>
            <artifactId>camel-rest-starter</artifactId>
            <version>${camel.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.0</version>
            <scope>provided</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

The serviceis starting and this is the console log:

2022-01-24 20:01:40.353  INFO 15796 --- [           main] c.d.c.CamelRestSpringbootApplication     : Starting CamelRestSpringbootApplication using Java 11.0.5 on pc-PC with PID 15796 (D:\Spring Boot\camel-rest-springboot\target\classes started by pc in D:\Spring Boot\camel-rest-springboot)
2022-01-24 20:01:40.357  INFO 15796 --- [           main] c.d.c.CamelRestSpringbootApplication     : No active profile set, falling back to default profiles: default
2022-01-24 20:01:43.583  INFO 15796 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
2022-01-24 20:01:43.604  INFO 15796 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2022-01-24 20:01:43.604  INFO 15796 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.56]
2022-01-24 20:01:43.820  INFO 15796 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2022-01-24 20:01:43.821  INFO 15796 --- [           main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 3235 ms
2022-01-24 20:01:45.228  INFO 15796 --- [           main] o.a.c.c.s.CamelHttpTransportServlet      : Initialized CamelHttpTransportServlet[name=CamelServlet, contextPath=]
2022-01-24 20:01:45.233  INFO 15796 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''
2022-01-24 20:01:45.592  INFO 15796 --- [           main] o.a.c.impl.engine.AbstractCamelContext   : Message DataType is enabled on CamelContext: camel-1
2022-01-24 20:01:45.607  INFO 15796 --- [           main] o.a.c.impl.engine.AbstractCamelContext   : Routes startup (total:1 started:1)
2022-01-24 20:01:45.607  INFO 15796 --- [           main] o.a.c.impl.engine.AbstractCamelContext   :     Started route1 (rest://get:javadsl/weather/%7Bcity%7D)
2022-01-24 20:01:45.607  INFO 15796 --- [           main] o.a.c.impl.engine.AbstractCamelContext   : Apache Camel 3.14.0 (camel-1) started in 370ms (build:83ms init:269ms start:18ms)
2022-01-24 20:01:45.617  INFO 15796 --- [           main] c.d.c.CamelRestSpringbootApplication     : Started CamelRestSpringbootApplication in 6.569 seconds (JVM running for 8.087)

But when I try to call the endpoint http://localhost:8080/services/javadsl/weather/london

It looks like this endpoint doesn't exist, the rest isn't created. I used debugger and the method getWeatherData() isn't called. And I think this log is not ok: Started route1 (rest://get:javadsl/weather/%7Bcity%7D), it should be something like that: route1 started and consuming from servlet:/javadsl/weather/%7Bcity%7D And the tutorial is from here: https://www.youtube.com/watch?v=spDjbC8mZf0&t=433s Thank you in advance!