How to use WireTap EIP using Apache Camel | Enterprise Integration Patterns

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>2.4.7</version>
      <relativePath/> <!-- lookup parent from repository -->
   </parent>
   <groupId>com.jss</groupId>
   <artifactId>camel</artifactId>
   <version>0.0.1-SNAPSHOT</version>
   <name>camel</name>
   <description>Apache Camel with Spring Boot</description>

   <properties>
      <java.version>1.8</java.version>
      <junit.platform.version>1.6.0</junit.platform.version>
      <camel.version>3.7.3</camel.version>
   </properties>

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

      <dependency>
         <groupId>org.apache.camel</groupId>
         <artifactId>camel-rabbitmq</artifactId>
         <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.projectlombok</groupId>
         <artifactId>lombok</artifactId>
         <optional>true</optional>
         <version>1.18.12</version>
      </dependency>

      <dependency>
         <groupId>org.junit.platform</groupId>
         <artifactId>junit-platform-runner</artifactId>
         <version>${junit.platform.version}</version>
         <scope>test</scope>
      </dependency>

      <dependency>
         <groupId>org.junit.vintage</groupId>
         <artifactId>junit-vintage-engine</artifactId>
         <version>5.7.0</version>
         <scope>test</scope>
      </dependency>

      <dependency>
         <groupId>org.apache.camel</groupId>
         <artifactId>camel-test-junit5</artifactId>
         <version>${camel.version}</version>
         <scope>test</scope>
      </dependency>

      <dependency>
         <groupId>org.apache.camel</groupId>
         <artifactId>camel-test-spring-junit5</artifactId>
         <version>${camel.version}</version>
         <scope>test</scope>
      </dependency>

   </dependencies>

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

</project>

CamelApplication.java

package com.jss.camel;

import org.apache.camel.ProducerTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@SpringBootApplication
public class CamelApplication {
   @Autowired
   ProducerTemplate producerTemplate;

   public static void main(String[] args) {
      SpringApplication.run(CamelApplication.class, args);
   }
}

Wiretap.java

package com.jss.camel.components;

import com.jss.camel.TransactionDto;
import org.apache.camel.Exchange;
import org.apache.camel.Message;
import org.apache.camel.builder.RouteBuilder;
import org.apache.camel.model.dataformat.JsonLibrary;
import org.apache.camel.support.DefaultMessage;
import org.springframework.stereotype.Component;

import java.util.Date;

import static org.apache.camel.LoggingLevel.ERROR;

@Component
public class Wiretap extends RouteBuilder {

    public static final String SENDER = "sender";
    public static final String RECEIVER = "receiver";
    public static final String AUDIT_TRANSACTION_ROUTE = "direct:audit-transaction";
    public static final String AUDIT = "audit-transactions";
    static final String RABBIT_URI = "rabbitmq://localhost:5672/amq.direct?queue=%s&routingKey=%s&autoDelete=false";

    @Override
    public void configure() throws Exception {
        fromF(RABBIT_URI, SENDER, SENDER)
                .unmarshal().json(JsonLibrary.Jackson, TransactionDto.class)
                .wireTap(AUDIT_TRANSACTION_ROUTE)
                .process(this::enrichTransactionDto)
                .marshal().json(JsonLibrary.Jackson, TransactionDto.class)
                .toF(RABBIT_URI, RECEIVER, RECEIVER)
                .log(ERROR, "Money Transferred: ${body}")
        ;

        from(AUDIT_TRANSACTION_ROUTE)
                .process(this::enrichTransactionDto)
                .marshal().json(JsonLibrary.Jackson, TransactionDto.class)
                .toF(RABBIT_URI, AUDIT, AUDIT);
    }

    private void enrichTransactionDto(Exchange exchange) {
        TransactionDto dto = exchange.getMessage().getBody(TransactionDto.class);
        dto.setTransactionDate(new Date().toString());

        Message message = new DefaultMessage(exchange);
        message.setBody(dto);
        exchange.setMessage(message);
    }
}