Apache Camel Tutorial - Send SMTP Email Using Gmail

In this tutorial we will create a simple application to send mail using apache camel. We will define a camel route which will read contents from a file and send it to multiple mail recipients.
We makes use of camel smtp end point to send mail.

Apache Camel - Table of Contents
File Transfer Using Java DSL Apache Camel
Apache Camel Java DSL + Spring Integration Hello World Example
Apache Camel Exception Handling Using Simple Example
Apache Camel Redelivery policy using example
Integrate Apache Camel and ActiveMQ
EIP patterns using Apache Camel
Apache Camel Tutorial- Integrate Spring Boot+ Apache Camel
Apache Camel Tutorial- Integrate with MySQL DB using SQL query
Apache Camel EIP - Splitter and Aggregator pattern
Apache Camel Unit Testing 
Apache Camel + Spring + Quartz Hello World Example 
Camel application deployment on JBoss Fuse 
Apache Camel + Apache CXF SOAP Webservices 
Apache Camel + JAX-RS REST Webservice
Apache Camel + CXFRS REST Webservice
Apache Camel Routing Slip EIP Pattern
Apache Camel Dynamic Router Pattern
Apache Camel Load Balancer EIP Pattern
Apache Camel Interceptors
Apache Camel + Kafka Hello World Example
Apache Camel - Marshalling/Unmarshalling XML/JSON Data Example
Calling and Consuming Webservices using Apache Camel
Apache Camel Tutorial - Send SMTP Email Using Gmail
Apache Camel Tutorial - SEDA component Hello World Example
Spring Boot + Apache Camel + RabbitMQ - Hello World Example
Apache Camel Tutorial - Idempotent Consumer using MemoryIdempotentRepository and FileIdempotentRepository
Spring Boot + Apache Camel JDBC component + MySQL - Hello World Example 
Spring Boot + Apache Camel SQL component + MySQL - Hello World Example
Spring Boot + Apache Camel SQL component + Transaction Management Example

Lets Begin

The File component is present in the camel-core jar itself.Other than this we will be using the camel-mail dependency for smtp endpoint.
We will create Eclipse maven project as follows-

Our pom file will be as follows-

<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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>com.javainuse</groupId>
	<artifactId>camel-java-dsl</artifactId>
	<version>0.0.1-SNAPSHOT</version>

	<dependencies>
		<dependency>
			<groupId>org.apache.camel</groupId>
			<artifactId>camel-core</artifactId>
			<version>2.13.0</version>
		</dependency>
		<!-- https://mvnrepository.com/artifact/org.apache.camel/camel-mail -->
		<dependency>
			<groupId>org.apache.camel</groupId>
			<artifactId>camel-mail</artifactId>
			<version>2.13.0</version>
		</dependency>

	</dependencies>
</project>

For sending mail using Gmail, google has provided instructions here As specified in this page fully qualified domain name of SMTP service is smtp.gmail.com and port is 465.
Next we create a class to construct a camel route. A Route is like an instruction definition to Camel on how to move your messages from one point to another. Here we will be routing the message from file endpoint to the smtp endpoint.

package com.javainuse;

import org.apache.camel.builder.RouteBuilder;

public class SimpleRouteBuilder extends RouteBuilder {

	@Override
	public void configure() throws Exception {
		from("file:C:/inputFolder?noop=true").doTry().setHeader("subject", simple("JavaInUse Invitation111"))
				.setHeader("to", simple("javainuse@gmail.com,testouthworking@gmail.com"))
				.to("smtps://smtp.gmail.com:465?username=testcamelsmtp@gmail.com&password=ABC@123");
	}
}

When Camel is started, it creates a CamelContext object that contains the definition of the Route to be started. Below we create default camel context and load the route created in SimpleRouteBuilder.

package com.javainuse;

import org.apache.camel.CamelContext;
import org.apache.camel.impl.DefaultCamelContext;

public class MainApp {

    public static void main(String[] args) {
        SimpleRouteBuilder routeBuilder = new SimpleRouteBuilder();
        CamelContext ctx = new DefaultCamelContext();
        try {
            ctx.addRoutes(routeBuilder);
            ctx.start();
            Thread.sleep(5 * 60 * 1000);
            ctx.stop();
        }
        catch (Exception e) {
            e.printStackTrace();
        }

    }
}
Run this MainApp.java.

In Gmail we get a mail as follows-

It may be needed for you to go to the Google Account Security page and allow less secure applications to access your account.

Download Source Code

Download it - Apache Camel Java Mail Application

See Also
Spring Boot Hello World Application- Create simple controller and jsp view using Maven
Spring Boot Tutorial-Spring Data JPA
Spring Boot + Simple Security Configuration
Pagination using Spring Boot Simple Example
Spring Boot + ActiveMQ Hello world Example
Spring Boot + Swagger Example Hello World Example
Spring Boot + Swagger- Understanding the various Swagger Annotations
Spring Boot Main Menu
Spring Boot Interview Questions