获取运行执行器运行状况和映射 URL 的“Whitelabel 错误页面”

Question

I am starting with spring boot, running a demo spring web starter project, I was checking the spring actuator functionality by calling http://localhost:8080/mappings and http://localhost:8080/health ... It's giving me the "Whitelabel Error Page"... the log is not showing anything

the project is a very simple boot application created in STS with one @RestController which is working fine

Main class:

@SpringBootApplication
public class DemoApplication {

    public static HashMap<Long,Student> hmStudent;

    public static void main(String[] args) {
        //dummt code
          SpringApplication.run(DemoApplication.class, args);
    }
}

Rest Controller:

import java.util.HashMap;

import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import com.example.demo.DemoApplication;
import com.example.demo.entities.Student;

@RestController
@RequestMapping(value="/rest/student")
class StudentService{

   @RequestMapping(value="/",method = RequestMethod.GET)
   public HashMap<Long,Student> getAllStudents(){
      return DemoApplication.hmStudent;
   }
.
.
.
.
}

application properties:

spring.datasource.url=jdbc:oracle:thin:@localhost:ibmwas
spring.datasource.username=u
spring.datasource.password=p
spring.datasource.driver-class-name=oracle.jdbc.driver.OracleDriver

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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>demo</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.0.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>
    </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-data-rest</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jta-atomikos</artifactId>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </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-devtools</artifactId>
        </dependency>
        <dependency>
            <groupId>com.oracle</groupId>
            <artifactId>ojdbc8</artifactId>
            <version>12.0.2</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-actuator</artifactId>
            <version>2.0.0.RELEASE</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

What is the problem and how can I the logs be more descriptive

Answer 1

As of Spring Boot 2.0.0.RELEASE the default prefix for all endpoints is /actuator So if you want to check the health of an application, you should go to /actuator/health

To make an actuator endpoint available via HTTP, it needs to be both enabled and exposed.

By default:

• only the /health and /info endpoints are exposed.

• all endpoints but /shutdown are enabled (only /health and /info are exposed)

To expose all endpoints you have to add the following line into application.properties :

management.endpoints.web.exposure.include=*

Answer 2

I had the same problem. After some trial and error, i got the actuator output when i hit http://localhost:8080 on the browser, it took me to the HAL browser . From the HAL's explorer, i typed actuator, which took me to http://localhost:8080/browser/index.html#http://localhost:8080/actuator and this is where are all the details I was looking for at http://localhost:8080/application was present.

Note Spring boot version that I am using is : 2.0.6 SNAPSHOT.

And, in the application.properties, i had added management.security.enabled=false. w/o this i could see very minimal info.

Answer 3

spring.mvc.throw-exception-if-no-handler-found=true
spring.resources.add-mappings=false