Spring boot custom starter , application doesn't find required bean - java

http://www.baeldung.com/spring-boot-custom-starter
I have followed tutorial and github example provided from the link above and have implemented similar way. I am using spring-boot-starter-parent :2.0.0.M3. Even after including my custom starter dependency in the pom for the app, it doesn't find required bean without #componentScan while deploying it.
It is giving following error.
APPLICATION FAILED TO START
Description:
Field fooApiCaller in com.core.controller.TestController required a bean of type 'service.ApiCaller' that could not be found.
Action:
Consider defining a bean of type 'service.ApiCaller' in your configuration.
Sample App ( one throwing error)
pom.xml
<dependency>
<groupId>abc.def</groupId>
<artifactId>custom-starter</artifactId>
<version>0.0.1-SNAPSHOT</version>
</dependency>
#Controller
public class FooController {
#Autowired
ApiCaller fooApiCaller
}
custom-starter module pom.xml
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
<version>${spring-boot.version}</version>
</dependency>
<dependency>
<groupId>abc.def</groupId>
<artifactId>custom-spring-boot-autoconfigure</artifactId>
<version>${project.version}</version>
</dependency>
<dependency>
<groupId>abc.def</groupId>
<artifactId>myapi</artifactId>
<version>${project.version}</version>
</dependency>
</dependencies>
Autoconfiguration module dependency
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot</artifactId>
<version>${spring-boot.version}</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-autoconfigure</artifactId>
<version>${spring-boot.version}</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-configuration-processor</artifactId>
<version>${spring-boot.version}</version>
<optional>true</optional>
</dependency>
<dependency>
<groupId>abc.def</groupId>
<artifactId>myapi</artifactId>
<version>${project.version}</version>
<optional>true</optional>
</dependency>
</dependencies>
spring factories code
org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
abc.def.myapi.autoconfigure.AutoConfiguration
MyAPI product
#Service
#Configuration
public class ApiCaller {
public String getName(String Id){return "name";}
}

Related

Succesfully deployed Spring MVC webapp responds 404

pls, bear with me as I am a beginner and this is also my first question placed here.
I am having the following problem:
I have a Spring MVC web app deployed with a CI/CD procedure, an AWS EC2 instance, three docker containers: one is the app, another is MySQL and then the third one is Tomcat. It is a maven project, built with Jenkins from a Github repo. The instance is up, containers are running and communicating, war file is deployed successfully by Jenkins, the app is present on tomcats manager.html.
Deployment is java based without web.xml. No Docker file either, the app container is on Jenkins BlueOcean. For one thing that I've noticed, the WebApplicationInitializer and the config files are not being included in the war file, not sure if it is supposed to be this way or not...
This is as far as I have come. App doesn't respond. Unfortunately, I've never seen a java web app deployed this way, or in any other way for that matter, so I am entirely at a loss. On my localhost it was working fine. Any help is greatly appreciated, thank you in advance! Please let me know if further code is needed.
This is my WebApplicationInitializer implementation:
public class SOAppInitializer implements WebApplicationInitializer {
#Override
public void onStartup(ServletContext container) {
XmlWebApplicationContext appContext = new XmlWebApplicationContext();
appContext.setConfigLocation("classpath:application-config.xml");
DispatcherServlet dispatcherServlet = new DispatcherServlet(appContext);
ServletRegistration.Dynamic registration = container.addServlet("dispatcher", dispatcherServlet);
registration.setLoadOnStartup(1);
registration.addMapping("/");
}
}
and the configuration
#EnableWebMvc
#ComponentScan(basePackages = "com.ownproject.S********r")
#Configuration
public class AppConfig extends WebMvcConfigurerAdapter {
// Resolve logical view names to .html resources in the /WEB-INF/views directory
#Bean
ViewResolver viewResolver() {
InternalResourceViewResolver resolver = new InternalResourceViewResolver();
resolver.setPrefix("WEB-INF/classes/templates");
return resolver;
}
#Override
public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
configurer.enable();
}
}
pom.xml:
<?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>2.5.3</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.ownproject</groupId>
<artifactId>Service-Organizer</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>Service-Organizer</name>
<packaging>war</packaging>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-security</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.thymeleaf.extras</groupId>
<artifactId>thymeleaf-extras-springsecurity5</artifactId>
<version>3.0.4.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.3.20</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>javax.inject</groupId>
<artifactId>javax.inject</artifactId>
<version>1</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-support</artifactId>
<version>5.3.19</version>
</dependency>
<dependency>
<groupId>org.seleniumhq.selenium</groupId>
<artifactId>selenium-java</artifactId>
<version>3.141.59</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.seleniumhq.selenium</groupId>
<artifactId>selenium-chrome-driver</artifactId>
<version>3.141.59</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.seleniumhq.selenium</groupId>
<artifactId>selenium-firefox-driver</artifactId>
<version>3.141.59</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.1.1</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-exec</artifactId>
<version>1.3</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>3.3.2</version>
<type>maven-plugin</type>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>3.3.2</version>
<configuration>
<failOnMissingWebXml>false</failOnMissingWebXml>
</configuration>
</plugin>
</plugins>
</build>
</project>
Docker.ps
Tomcat screenshot

BeanCreationException: Error creating bean with name 'configurationPropertiesBeans' defined in class path resource

I'm writing a small program for circuit breaker, When running the application it throws exceptions. springboot versin 2.5.4, Hystrix Version using 2.2.6
BeanCreationException: Error creating bean with name 'configurationPropertiesBeans' defined in class path resource [org/springframework/cloud/autoconfigure/ConfigurationPropertiesRebinderAutoConfiguration.class]: Post-processing of merged bean definition failed; nested exception is java.lang.IllegalStateException: Failed to introspect Class [org.springframework.cloud.context.properties.ConfigurationPropertiesBeans] from ClassLoader [jdk.internal.loader.ClassLoaders$AppClassLoader#659e0bfd]
Pom.xml
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.5.4</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
<groupId>com.ramgovindhare</groupId>
<artifactId>cricuitbreakerhystrix</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>CricuitBreakerHystrix</name>
<description>firstMicroserviceProject</description>
<properties>
<java.version>11</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-netflix-hystrix -->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
<version>2.2.8.RELEASE</version> <--- **See this**
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
CricuitBreakerHystrixApplication.java
#SpringBootApplication
#EnableCircuitBreaker
public class CricuitBreakerHystrixApplication {
public static void main(String[] args) {
SpringApplication.run(CricuitBreakerHystrixApplication.class, args);
}
}
Controller class
#RestController
public class CricutiBreakerHystrixController {
#GetMapping("/process")
#HystrixCommand(fallbackMethod = "doWork")
public String doProcess() {
String response = "This msg come for processes";
int i = 10 / 0;
return response;
}
public String doWork() {
return "This msg coming from doWork()...!!";
}
}
Just add spring-cloud-dependencies to dependencyManagement block:
<properties>
<spring.cloud-version>2020.0.3</spring.cloud-version>
</properties>
<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>
Corresponding version of spring-cloud can be find here
The spring boot version and spring cloud version should be matched in strict accordance with the official version. Link to the official website:spring-cloud

Not able to access application on Tomcat with Swagger, Spring, Hibernate

I am using Swagger-UI and Codegen to generate my APIs and then I am using Spring Boot and Hibernate in my application.
When I build my application and run via Maven command mvn spring-boot:run, my application runs and Swagger UI is displayed. But when I create the WAR file and deploy it to Tomcat server, I am not able to access the application. I do not see any errors in Catalina logs. Any advice on what could be going wrong?
pom.xml:
<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 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.datadivers</groupId>
<artifactId>swagger-spring</artifactId>
<packaging>war</packaging>
<name>swagger-spring</name>
<version>1.0.0</version>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.4.5</version>
</parent>
<properties>
<java.version>1.8</java.version>
<maven.compiler.source>${java.version}</maven.compiler.source>
<maven.compiler.target>${java.version}</maven.compiler.target>
<springfox-version>2.9.2</springfox-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-tomcat</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<!--SpringFox dependencies -->
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger2</artifactId>
<version>${springfox-version}</version>
</dependency>
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger-ui</artifactId>
<version>${springfox-version}</version>
</dependency>
<dependency>
<groupId>com.github.joschi.jackson</groupId>
<artifactId>jackson-datatype-threetenbp</artifactId>
<version>2.6.4</version>
</dependency>
<!-- Bean Validation API support -->
<dependency>
<groupId>javax.validation</groupId>
<artifactId>validation-api</artifactId>
</dependency>
<dependency>
<groupId>jakarta.xml.bind</groupId>
<artifactId>jakarta.xml.bind-api</artifactId>
</dependency>
<dependency>
<groupId>org.xerial</groupId>
<artifactId>sqlite-jdbc</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>javax.annotation</groupId>
<artifactId>javax.annotation-api</artifactId>
</dependency>
</dependencies>
<build>
<sourceDirectory>src</sourceDirectory>
<finalName>bankingapi</finalName>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<version>2.1.5.RELEASE</version>
<executions>
<execution>
<goals>
<goal>repackage</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
Spring Boot application:
imports...
#SpringBootApplication
#EnableSwagger2
#EnableJpaRepositories(basePackages = "com.datadivers.repository")
#EntityScan(basePackages = "com.datadivers.model")
#ComponentScan(basePackages = { "io.swagger", "io.swagger.configuration", "com.datadivers.api", "com.datadivers.service"})
public class Swagger2SpringBoot extends SpringBootServletInitializer{
public static void main(String[] args) {
SpringApplication.run(Swagger2SpringBoot.class, args);
}
#Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
return application.sources(Swagger2SpringBoot.class);
}
}
The suggestion from #PiotrP.Karwasz worked for me. Hence submitting this as the answer to my problem. Thank you for the help.
Spring 5 requires a Java EE 8 server (it provides a
javax.servlet.ServletContainerInitializer), while Tomcat 10 is a
Jakarta EE 9 server (it searches for a
jakarta.servlet.ServletContainerInitializer): see this question.
Downgrade to Tomcat 9.0 and it should work.
In Intellij idea
in project structure, you can create artifacts
pay attention to output directory this path must be excluded in Module section
now you can add war file to Deployment Section in Configuration Section
if you have security checked the access when input url swagger in to browser
Try this guideline https://www.baeldung.com/spring-boot-war-tomcat-deploy#creating-a-spring-boot-war
add a Tomcat dependency
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<scope>provided</scope>
</dependency>
and add SpringBootServletInitializer
like in example
#SpringBootApplication
public class SpringBootTomcatApplication extends SpringBootServletInitializer {
}

NoSuchFieldError: DEFAULT_INCOMPATIBLE_IMPROVEMENTS

While trying out Netflix hystrix on Spring boot 2.3.3 gives the following error -
...
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'freeMarkerConfigurer' defined in org.springframework.cloud.netflix.hystrix.dashboard.HystrixDashboardConfiguration: Invocation of init method failed; nested exception is java.lang.NoSuchFieldError: DEFAULT_INCOMPATIBLE_IMPROVEMENTS
Main SimpleClientApplication.java has following annotation
#SpringBootApplication
#EnableCircuitBreaker
#EnableHystrixDashboard
ProductListController.java
...
#RestController
#EnableAutoConfiguration(exclude = { FreeMarkerAutoConfiguration.class })
public class ProductListController {
#GetMapping
#HystrixCommand(fallbackMethod = "defaultProducts")
public List<String> cloudProductList() {
RestTemplate restTemplate = new RestTemplate();
URI uri = URI.create("http://localhost:8090/products");
return restTemplate.getForObject(uri, List.class);
}
public List<String> defaultProducts() {
return Arrays.asList("Spring Cloud");
}
}
pom.xml
...
4.0.0
org.springframework.boot
spring-boot-starter-parent
2.3.3.RELEASE
com.demo
simple-client-application
1.0
simple-client-application
Demo project for Spring Boot
<properties>
<java.version>14</java.version>
<spring-cloud.version>Hoxton.SR8</spring-cloud.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
<version>2.1.0.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-hystrix-dashboard</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-autoconfigure</artifactId>
</dependency>
<dependency>
<groupId>freemarker</groupId>
<artifactId>freemarker</artifactId>
<version>2.3.9</version>
</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>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-netflix-hystrix</artifactId>
<version>2.1.0.RELEASE</version>
</dependency>
<dependency>
<groupId>org.freemarker</groupId>
<artifactId>freemarker</artifactId>
<version>2.3.9</version>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.9.6</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-autoconfigure</artifactId>
<version>2.3.3.RELEASE</version>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
I tried many solutions:
Adjusted maven pom with freemarker exclusions and adding explicitly spring-context-support.
Added spring.freemarker.check-template-location: false
Added spring.freemarker.enabled: false
and none of these combinations were working for me, at every start of my Spring-Boot App I got the same error you mentioned.
Finally I found that just re-defining the suffix with:
spring
freemarker:
suffix: .ftl
and setting up:
#EnableAutoConfiguration(exclude = {FreeMarkerAutoConfiguration.class})
in my AppConfig class (the Class which contains the #Configuration annotation), my App is starting after that change.
I have to mention that I use Freemarker without template stored in my App but just using it as a runtime dependency (my Freemarker templates are just texts (Java String) passed in my Class Methods), then I don't really care about the file extensions. I do not want to use the Freemarker auto-configure and I just added the dependency explicitly:
<dependency>
<groupId>org.freemarker</groupId>
<artifactId>freemarker</artifactId>
<version>${freemarker.version}</version>
</dependency>

The import de.codecentric.boot.admin.server.config.EnableAdminServer cannot be resolved

I am developing the Microservices code by taking reference from https://github.com/spring-petclinic/spring-petclinic-microservices. I was able to successfully run all the modules, but I'm getting the below error.
The import de.codecentric.boot.admin.server.config.EnableAdminServer cannot be resolved
From the spring-petclinic-admin-server module, I am getting the below error.
import de.codecentric.boot.admin.server.config.EnableAdminServer;
#Configuration
#EnableAutoConfiguration
#EnableAdminServer
#EnableDiscoveryClient
public class SpringBootAdminApplication {
public static void main(String[] args) {
SpringApplication.run(SpringBootAdminApplication.class, args);
}
}
I was able to start the other microservices modules.
pom.xml
<parent>
<groupId>org.springframework.samples</groupId>
<artifactId>spring-petclinic-microservices</artifactId>
<version>2.0.4</version>
</parent>
<properties>
<spring-boot-admin.version>2.0.1</spring-boot-admin.version>
<docker.image.exposed.port>9090</docker.image.exposed.port>
<docker.image.dockerfile.dir>${basedir}/../docker</docker.image.dockerfile.dir>
</properties>
<dependencies>
<!-- Spring Boot -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-config</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
<!-- Spring Boot Admin -->
<dependency>
<groupId>de.codecentric</groupId>
<artifactId>spring-boot-admin-starter-server</artifactId>
<version>${spring-boot-admin.version}</version>
</dependency>
<dependency>
<groupId>de.codecentric</groupId>
<artifactId>spring-boot-admin-server-ui</artifactId>
<version>${spring-boot-admin.version}</version>
</dependency>
<!-- Third-party librairies -->
<dependency>
<groupId>org.jolokia</groupId>
<artifactId>jolokia-core</artifactId>
</dependency>
</dependencies>
As per the link : https://codecentric.github.io/spring-boot-admin/current/. I have added below dependencies, then it works well.
<dependency>
<groupId>de.codecentric</groupId>
<artifactId>spring-boot-admin-starter-server</artifactId>
<version>2.1.0-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>

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