Create a REST API in spring integration using Spring tool suite

Question

I need to create Restful APIs in Spring Integration.I found a example for the same in https://github.com/spring-projects/spring-integration-samples/tree/master/intermediate/rest-http But somehow this example is not working for me. I was wondering if there is any way to create a Restful API in Spring Integration using STS. As STS provides graphs for Spring Integration, how can we create a REST API using STS graphs directly.

Thanks in Advance.

I imported the Rest-http example in STS, ran Spring Tools->Update Maven dependencies and then Run As on Pivotal tc server. I am getting error: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'integrationEvaluationContext':... I want to create a sample REST API using Spring Integration similar to given in this example. I have less time for development, can I implement same example using STS quickly. — pogo22
I suggest you edit your question to include this information. "...is not working for me..." is not a suitable question for stack overflow. — Gary Russell

Gary Russell Gary Russell · Accepted Answer · 2015-09-22T15:54:40

I don't know why you are having trouble with the sample, I just tested it and it worked ok.

However, probably the simplest way to get started with STS is (using a recent version >= 3.7)...

File | New... | Spring Starter Project
Set the name to, e.g. rest
Click next
Select Web, Integration (under IO)
Click Finish
Open demo.RestApplication (where Rest is capitalized name from #2)
Add @ImportResource("classpath:context.xml")
Create context.xml in src/main/resources
Run the application and hit http://localhost:8080/foo/bar in your browser - it will output BAR.

RestApplication:

@SpringBootApplication
@ImportResource("classpath:context.xml")
public class RestApplication {

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

}

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:int="http://www.springframework.org/schema/integration"
    xmlns:int-http="http://www.springframework.org/schema/integration/http"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/integration http://www.springframework.org/schema/integration/spring-integration.xsd
        http://www.springframework.org/schema/integration/http http://www.springframework.org/schema/integration/http/spring-integration-http.xsd">

    <int-http:inbound-gateway request-channel="in"
            path="/foo/{id}"
            supported-methods="GET"
            request-payload-type="java.lang.String">
        <int-http:header name="requestedId" expression="#pathVariables.id" />
    </int-http:inbound-gateway>

    <int:transformer input-channel="in" expression="headers['requestedId'].toUpperCase()" />

</beans>

EDIT

To make a deployable war, follow the Spring Boot instructions 'Create a deployable war' here.

But see the note about old servlet containers that don't support servlet 3.x.

Here's the updated RestApplication class...

@SpringBootApplication
@ImportResource("classpath:context.xml")
public class RestApplication extends SpringBootServletInitializer {

    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
        return application.sources(RestApplication.class);
    }

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

}

Create a REST API in spring integration using Spring tool suite

2 Answers