Modular #Configuration/#Bean in Spring Boot - spring-boot

Question

I'm making a MicroServices based project so I have more the one Spring Boot projects in my workspace. I need to configure restOperations in some of then but I want to configure once for all the project that needs. So I'm trying to add my #Configuration class to a jar and import in each MS projects.
The problem is, when I execute the MS project in my server, I receive this error:
***************************
APPLICATION FAILED TO START
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Description:
Field restOperations in com.epavanellio.base.business.controller.BusinessController required a bean of type 'org.springframework.web.client.RestOperations' that could not be found.
The injection point has the following annotations:
- #org.springframework.beans.factory.annotation.Autowired(required=true)
Action:
Consider defining a bean of type 'org.springframework.web.client.RestOperations' in your configuration.
Here I have my Rest configuration class:
package com.epavanellio.base.restConfig;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.impl.client.LaxRedirectStrategy;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.client.ClientHttpRequestFactory;
import org.springframework.http.client.HttpComponentsClientHttpRequestFactory;
import org.springframework.stereotype.Component;
import org.springframework.web.client.RestOperations;
import org.springframework.web.client.RestTemplate;
//#Component
#Configuration
public class SimpleRestConfiguration {
final CloseableHttpClient httpClient = HttpClientBuilder.create().setRedirectStrategy(new LaxRedirectStrategy())
.build();
#Bean
public RestOperations createRestTemplate(final ClientHttpRequestFactory clientHttpRequestFactory){
return new RestTemplate(clientHttpRequestFactory);
}
#Bean
public ClientHttpRequestFactory createHttpRequestFactory (#Value("${rest.connect.timeout}") final int connectTimeout,
#Value("${rest.read.timeout}") final int readTimeout) {
HttpComponentsClientHttpRequestFactory clientHttpRequestFactory = new HttpComponentsClientHttpRequestFactory();
clientHttpRequestFactory.setConnectTimeout(connectTimeout);
clientHttpRequestFactory.setReadTimeout(readTimeout);
clientHttpRequestFactory.setHttpClient(httpClient);
return clientHttpRequestFactory;
}
}
I imported the .jar (dpdc-rest) with has the SimpleRestConfiguration class in my MS project POM:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.3.4.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.epavanellio.base</groupId>
<artifactId>ms-manager-business</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>ms-manager-business</name>
<description>Validate business logic. A microservice based project. </description>
<packaging>war</packaging>
<properties>
<java.version>11</java.version>
</properties>
<dependencies>
<dependency>
<groupId>com.epavanellio.base</groupId>
<artifactId>domain</artifactId>
<version>0.0.1-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>com.epavanellio.base</groupId>
<artifactId>dpdc-rest</artifactId>
<version>0.0.1-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>com.epavanellio.base</groupId>
<artifactId>dpdc-custom-exception-handler</artifactId>
<version>0.0.1-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>org.hibernate.validator</groupId>
<artifactId>hibernate-validator</artifactId>
</dependency>
<dependency>
<groupId>org.hibernate.validator</groupId>
<artifactId>hibernate-validator-annotation-processor</artifactId>
</dependency>
<dependency>
<groupId>javax.el</groupId>
<artifactId>javax.el-api</artifactId>
<version>3.0.0</version>
</dependency>
<dependency>
<groupId>org.glassfish.web</groupId>
<artifactId>javax.el</artifactId>
<version>2.2.6</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies>
<build>
<finalName>ms-manager-business</finalName>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
and in my MS application class is like this:
package com.epavanellio.base.business;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.domain.EntityScan;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
import org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Import;
import com.epavanellio.base.restConfig.SimpleRestConfiguration;
//#SpringBootApplication(scanBasePackages={"com.epavanellio.base", "com.epavanellio.base.restConfig"})
//#Import(SimpleRestConfiguration.class)
//#ComponentScan({"com.epavanellio.base", "com.epavanellio.base.restConfig"})
#ComponentScan("com.epavanellio.base")
#EntityScan("com.epavanellio.base.domain")
#EnableAutoConfiguration(exclude={DataSourceAutoConfiguration.class,HibernateJpaAutoConfiguration.class})
#SpringBootApplication
public class BusinessApplication extends SpringBootServletInitializer{
public static void main(String[] args) {
SpringApplication.run(BusinessApplication.class, args);
}
#Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
return application.sources(BusinessApplication.class);
}
}
as you can see commented, I already tried to my make my runtime "see" my configuration class in diffrent ways:
First I tried to add (scanBasePackages={"com.epavanellio.base", "com.epavanellio.base.restConfig"}) after my annotation #SpringBootApplication, but the same error occurs. Then I tried to add specifically the SimpleRestConfiguration class package to the #ComponentScan annotation(for this, I uncommented the #Component annotation in SimpleRestConfiguration class), but the same error occurs. At least I tried to use #Import, but in this case I receive the error:
java.io.FileNotFoundException: class path resource [com/epavanellio/base/restConfig/SimpleRestConfiguration.class] cannot be opened because it does not exist
does any one know how can I make my application class to "see" my
#Configuration class?

Answer 1

The problem was Maven, for some reason maven was no recognizing my jar.
so I made a new dependency project, with a new name but same same SimpleRestConfiguration class. I imported the new .Jar to my MS and then works fine.
My application become like this:
#ComponentScan("com.epavanellio.base")
#EntityScan("com.epavanellio.base.domain")
#EnableAutoConfiguration(exclude={DataSourceAutoConfiguration.class,HibernateJpaAutoConfiguration.class})
#SpringBootApplication
public class UserApplication extends SpringBootServletInitializer{
public static void main(String[] args) {
SpringApplication.run(UserApplication.class, args);
}
#Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
return application.sources(UserApplication.class);
}
}