Apache Camel provides many components to interact with external systems. Here is one simple example of how to connect MongoDB using the Apache Camel route.

1. Create a Maven project and add the below dependencies:

<dependencies>
        <dependency>
            <groupId>org.apache.camel</groupId>
            <artifactId>camel-core</artifactId>
            <version>2.12.1</version>
        </dependency>
        <dependency>
            <groupId>org.apache.camel</groupId>
            <artifactId>camel-spring</artifactId>
            <version>2.12.1</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>3.2.4.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>3.2.4.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>3.2.4.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>3.2.4.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.apache.camel</groupId>
            <artifactId>camel-jetty</artifactId>
            <version>2.12.1</version>
        </dependency>
        <dependency>
            <groupId>org.apache.camel</groupId>
            <artifactId>camel-mongodb</artifactId>
            <version>2.12.1</version>
        </dependency>
    </dependencies>

2. Create a Camel route:

packagecom.vinod.test;

importorg.apache.camel.builder.RouteBuilder;

publicclass CamelMongoRoute extends RouteBuilder {
    @Override
    publicvoid configure()throwsException{
        from("jetty:http://localhost:8181/mongoSelect")
                .to("mongodb:myDb?database=customerdb&collection=customer&operation=findAll");
        from("jetty:http://localhost:8181/mongoInsert")
                .to("mongodb:myDb?database=customerdb&collection=customer&operation=insert");
    }
}

3. Create application context.xml:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:camel="http://camel.apache.org/schema/spring"
    xsi:schemaLocation="
          http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
         http://camel.apache.org/schema/spring http://camel.apache.org/schema/spring/camel-spring.xsd">
    <camel:camelContext id="camel-client">
        <camel:routeBuilder ref="vinodroute" />
    </camel:camelContext>
    <bean id="myDb" class="com.mongodb.Mongo">
        <constructor-arg index="0" value="localhost" />
    </bean>
    <bean id="vinodroute" class="com.vinod.test.CamelMongoRoute" />
</beans>

4. Create a main program. This main program will start the routes:

package com.vinod.test;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class CamelMongoMain {
    @SuppressWarnings("resource")
    public static void main(String[] args) {
                      new ClassPathXmlApplicationContext("application-context.xml");
    }
}

5. Run it!

5a. Start MongoDB.

5b. Run the main program.

5c. Use the REST client to give inputs.

6. Insert data into MongoDB. The URL is http://localhost:8181/mongoInsert

Request body= {name:"Vinod K K"}

7. Retrieve data. Again, the URL is http://localhost:8181/mongoSelect.

Response from mongodb = [{ "_id" : { "$oid" : "5419cefb0364771a127e352c"} , "name" : "Vinod K K"}]

Data in mongodb
> use customerdb
switched to db customerdb
> show collections
customer
system.indexes
> db.customer.find()
{ "_id" : ObjectId("5419cefb0364771a127e352c"), "name" : "Vinod K K" }
> 

You're done! You can download the example here.