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I am a software engineer with a passion for learning. I have been programming primarily with Java, Scala and other JVM based languages for 15+ years now. http://biju-allandsundry.blogspot.com is my blog site where I regularly record my learnings. Biju is a DZone MVB and is not an employee of DZone and has posted 17 posts at DZone. You can read more from them at their website. View Full User Profile

Spring Integration Standalone Application with Spring Boot

03.14.2014
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I had earlier blogged about a way to write a standalone Spring Integration application. Spring Boot makes creating this standalone application much simpler.

The simple flow was to poll the USGS service providing information about the earthquake activity around the world and to log this information. The flow described using Spring Integration is the following:
<int:inbound-channel-adapter channel="quakeinfotrigger.channel" expression="''">
 <int:poller fixed-delay="60000"></int:poller>
</int:inbound-channel-adapter>
 
<int:channel id="quakeinfo.channel">
 <int:queue capacity="10"/>
</int:channel>
 
<int:channel id="quakeinfotrigger.channel"></int:channel>
 
<int-http:outbound-gateway id="quakerHttpGateway"
	request-channel="quakeinfotrigger.channel"
	url="http://earthquake.usgs.gov/earthquakes/feed/geojson/all/hour"
	http-method="GET"
	expected-response-type="java.lang.String"
	charset="UTF-8"
	reply-timeout="5000"
	reply-channel="quakeinfo.channel">    
</int-http:outbound-gateway>
 
<int:logging-channel-adapter id="messageLogger" log-full-message="true" channel="quakeinfo.channel" level="ERROR">
 <int:poller fixed-delay="5000" ></int:poller>
</int:logging-channel-adapter>
Pre-boot, the way to write a main program to start this flow would have been along these lines:

package standalone;
import org.springframework.context.support.ClassPathXmlApplicationContext;
 
public class Main {
 public static void main(String[] args) {
  ClassPathXmlApplicationContext applicationContext = new ClassPathXmlApplicationContext("classpath:/httpgateway.xml");
  applicationContext.registerShutdownHook();
 }
}
With Spring-boot however the configuration is IMHO simpler:
mvn spring-boot:run
I had a very small hand in fixing this start-up script by contributing a change to the plugin to start-up the application without needing to manually run the compilation step first.

Even better, the spring-boot-maven-plugin provides tools to package the entire application into a executable jar which gets triggered during the package phase, along the lines of shade plugin:
mvn package
and the executable jar run this way:
java -jar target/si-standalone-sample-1.0-SNAPSHOT.jar

An updated project with this change is available at this github location - https://github.com/bijukunjummen/si-standalone-sample

Published at DZone with permission of Biju Kunjummen, author and DZone MVB. (source)

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