throw ConverterNotFoundException using spring-cloud-consul for int property - spring

Question

I got the following error message when starting a spring boot/cloud application which gets some properties from consul:
***************************
APPLICATION FAILED TO START
***************************
Description:
Binding to target demo.config.Config#5b4954b2 failed:
Property: config.number
Value: ${config.number:5}
Reason: Failed to convert property value of type 'java.lang.String' to required type 'int' for property 'number'; nested exception is org.springframework.core.convert.ConverterNotFoundException: No converter found capable of converting from type [java.lang.String] to type [int]
Action:
Update your application's configuration
Here's my main class:
#SpringBootApplication
#WebAppConfiguration
#EnableDiscoveryClient
#EnableConfigurationProperties
public class DemoApplication {
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
}
And the configuration property class:
#Component
#ConfigurationProperties(prefix="config")
public class Config {
private int number;
public int getNumber() {
return number;
}
public void setNumber(int number) {
this.number = number;
}
}
The application.yml file is:
server:
port: 8100
spring:
application:
name: demo
And the bootstrap.yml file:
spring:
cloud:
consul:
host: localhost
port: 8500
config:
enabled: true
prefix: config
config:
number: ${config.number:5}
Finally the related part of maven pom.xml file:
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.3.RELEASE</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
<spring-cloud.version>Dalston.SR1</spring-cloud.version>
<cucumber.version>1.2.5</cucumber.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-config</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-eureka</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-consul-discovery</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-consul-config</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-configuration-processor</artifactId>
<optional>true</optional>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>

Answer 1

I found the problem is because PropertySourceBootstrapConfiguration cannot locate property source from consul in some case. If PropertySourceBootstrapConfiguration is properly initiated during the booting up, there's no such exception and the app works as expected.