CODEWITHSUNDEEP
javaspring-bootspring-integration
Kumar Sambhav
Kumar Sambhav

Reputation: 7765

Standalone Spring Boot Integration Java Project

I am trying to build a standalone Spring Integration application that has an inbound RabbitMQ based gate way. As the application needs not to handle HTTP requests, I want to make it a runnable Java project (that can be simple run using java -jar). I borrowed this idea after going through a Spring Batch Guide example :-

Make the application executable

Although batch processing can be embedded in web apps and WAR files, the simpler approach demonstrated below creates a standalone application. You package everything in a single, executable JAR file, driven by a good old Java main() method.

PROBLEM 1

How should I start my Spring Boot application ? The Spring Boot Java application must run endlessly until interuppted.

PROBLEM 2

Exclude web project nature. Currently I trying my luck using :-

@SpringBootApplication(exclude = { WebMvcAutoConfiguration.class,
    EmbeddedServletContainerAutoConfiguration.class,
    DispatcherServletAutoConfiguration.class,
    EmbeddedWebApplicationContext.class })
// THESE excludes are not helping. !!!
public class MyIntegrationApplication {

    public static void main(String[] args) throws InterruptedException {            
        System.exit(SpringApplication.exit(SpringApplication.run(
                DelinquencyEngineApplication.class, args)));
    }
}

As my classpath has Spring Web MVC jar (indirectly through spring-boot-starter-integration dependency ), trying to run above main method results in this execption:-

Exception in thread "main" org.springframework.context.ApplicationContextException: Unable to start embedded container; nested exception is org.springframework.context.ApplicationContextException: Unable to start EmbeddedWebApplicationContext due to missing EmbeddedServletContainerFactory bean.
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.onRefresh(EmbeddedWebApplicationContext.java:133)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:476)
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:118)
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:686)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:320)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:957)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:946)
    at com.hcentive.wfm.delinquency.DelinquencyEngineApplication.main(DelinquencyEngineApplication.java:27)
Caused by: org.springframework.context.ApplicationContextException: Unable to start EmbeddedWebApplicationContext due to missing EmbeddedServletContainerFactory bean.
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.getEmbeddedServletContainerFactory(EmbeddedWebApplicationContext.java:183)
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.createEmbeddedServletContainer(EmbeddedWebApplicationContext.java:156)
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.onRefresh(EmbeddedWebApplicationContext.java:130)
    ... 7 more

How can I completely exclude web project nature ? Tried some excludes on @SpringBootApplication but it didn't help.

PROBLEM 3

How should I handle graceful shutdown ? My application should not end abruptly when someone kills the Java application.

Spring Boot 1.2.3 is used.

Thanks.

Upvotes: 4

Views: 1400

Answers (1)

Nicolas Labrot
Nicolas Labrot

Reputation: 4106

PROBLEM 1

A spring boot application will run until you stop it. It is a standard java application. You can run it using the java command

java -jar target/mymodule-0.0.1-SNAPSHOT.jar

The main issue will be the packaging. Have a look at :

PROBLEM 2

To exclude the web nature you should use the SpringApplicationBuilder builder 

new SpringApplicationBuilder(Application.class).web(false).run(args);

PROBLEM 3

In console mode CTRL+C will shutdown gracefully. In daemon mode, the Maven App assembler plugin (which embed JSW) will output a shell script with start/stop. As suggested by Gary, see too Spring Integration Documentation about orderly shutdown

Upvotes: 4

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