camel-spring-javaconfig test issue

[Bede Bignell]

Kia ora,

I'm having an issue writing a camel-spring-javaconfig test of a camel route 
where the RouteBuilder bean relies on Spring to inject fields annotated with 
@Value.

This repo: https://github.com/bedebignell/camel-bug-repro/ is able to reproduce 
the error by running 'mvn test 
-Dtest=nz.bignell.bede.camel.ReproduceUnableToLoadProperties'

The project uses the BOM versions Camel 3.6.0 and Spring 5.1.15.RELEASE and the 
dependencies (pom here: 
https://github.com/bedebignell/camel-bug-repro/blob/main/pom.xml):
 * camel-core
 * camel-spring-javaconfig
 * camel-spring
 * spring-web
// Testing deps
 * camel-test
 * camel-test-spring
 * spring-test


The class extending RouteBuilder relies on Spring to inject to field with a 
value (@Value("${rankOfCamel}")   int rankOfCamel). When the Spring 
@TestPropertySource hasn't been loaded/processed so the int property is 
attempted to be loaded with the literal string "${rankOfCamel}" which errors 
throwing a NumberFormatException.

Here is the test class (class here: 
https://github.com/bedebignell/camel-bug-repro/blob/main/src/test/java/nz/bignell/bede/camel/ReproduceUnableToLoadProperties.java):

package nz.bignell.bede.camel;

import org.apache.camel.ExchangePattern;
import org.apache.camel.ProducerTemplate;
import org.apache.camel.builder.RouteBuilder;
import org.apache.camel.spring.javaconfig.SingleRouteCamelConfiguration;
import org.apache.camel.test.spring.CamelSpringDelegatingTestContextLoader;
import org.apache.camel.test.spring.CamelSpringRunner;
import org.junit.Assert;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.stereotype.Component;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.TestPropertySource;
import org.springframework.test.context.junit4.AbstractJUnit4SpringContextTests;

@RunWith(CamelSpringRunner.class)
@ContextConfiguration(classes = 
{ReproduceUnableToLoadProperties.ExampleRouteBuilder.class, 
ReproduceUnableToLoadProperties.ContextConfig.class}, loader = 
CamelSpringDelegatingTestContextLoader.class)
@TestPropertySource(
    properties = {
        "rankOfCamel=1"
    }
)
public class ReproduceUnableToLoadProperties extends 
AbstractJUnit4SpringContextTests {
  @Autowired
  ProducerTemplate genericProducer;

  @Test
  public void checkProducer() {
    Assert.assertTrue(true);
    Assert.assertNotNull(genericProducer);
    Object resp = genericProducer.sendBody("direct:testA", 
ExchangePattern.InOut, "Klaus");
    Assert.assertEquals("hi Klaus", resp);
  }

  @Component
  public static class ExampleRouteBuilder extends RouteBuilder {
    @Value("${rankOfCamel}")
    int rankOfCamel;

    @Override
    public void configure() throws Exception {
      from("direct:testA")
          .log("Camel is number: " + rankOfCamel)
          .setBody(constant("hi ").append(body().convertToString()))
      ;
    }
  }

  @Configuration
  public static class ContextConfig extends SingleRouteCamelConfiguration {
    ReproduceUnableToLoadProperties.ExampleRouteBuilder exampleRouteBuilder;

    // Constructor Injection of Spring bean 'ExampleRouteBuilder'
    ContextConfig(ReproduceUnableToLoadProperties.ExampleRouteBuilder 
exampleRouteBuilder) {
      this.exampleRouteBuilder = exampleRouteBuilder;
    }

    @Override
    @Bean
    public RouteBuilder route() {
      return exampleRouteBuilder;
    }
  }
}

Regards
Bede


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