caché de arranque primavera no se trabaja con @PostConstruct o @AfterPropertiesSet

d48b:

Trato de inicializar la caché de datos, cuando mi inicio de la aplicación, y que no funciona. Mi código:

springBootApplication

package com.r2b.springcache;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cache.CacheManager;
import org.springframework.cache.annotation.EnableCaching;
import org.springframework.cache.concurrent.ConcurrentMapCacheManager;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;

@ComponentScan("com.r2b")
@SpringBootApplication
@EnableCaching
public class SpringCacheApplication {

    public static void main(String[] args) {
        SpringApplication.run(SpringCacheApplication.class, args);
    }

    @Bean
    public CacheManager cacheManager() {
        return new ConcurrentMapCacheManager("student");
    }
}

estudiante

package com.r2b.model;

public class Student {

    String id;
    String name;
    String clz;

    public Student(String id, String name, String clz) {
        super();
        this.id = id;
        this.name = name;
        this.clz = clz;
    }

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getClz() {
        return clz;
    }

    public void setClz(String clz) {
        this.clz = clz;
    }

    //Setters and getters

}

studentService

package com.r2b.service;

import org.springframework.cache.annotation.Cacheable;
import org.springframework.stereotype.Service;

import com.r2b.model.Student;

@Service
public class StudentService  
{

    @Cacheable("student")
    public Student getStudentByID(String id)
    {
        try
        {
            System.out.println("Going to sleep for 5 Secs.. to simulate backend call.");
            Thread.sleep(1000*5);
        }
        catch (InterruptedException e)
        {
            e.printStackTrace();
        }

        return new Student(id,"Sajal" ,"V");
    }

}

StudentController

package com.r2b.controller;

import javax.annotation.PostConstruct;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;

import com.r2b.model.Student;
import com.r2b.service.StudentService;

@RestController
public class StudentController
{

    @Autowired
    StudentService studentService;


    @PostConstruct
    public void init() {
        studentService.getStudentByID("1");
    }

    @GetMapping("/student/{id}")
    public Student findStudentById(@PathVariable String id)
    {
        System.out.println("Searching by ID  : " + id);

        return studentService.getStudentByID(id);
    }
}

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.r2b</groupId>
    <artifactId>spring-cache</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>spring-cache</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.5.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-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

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


</project>

cuando voy a http: // localhost: 8080 / estudiante / 1 la primera vez, la caché no está activo, y la respuesta tarda más de 5 segundos, pero cuando lo actualice, responde el caché, y la solicitud tarda unos pocos milisegundos ! a pesar de eso que se llama el método de caché en PostConstruct, tengo intento con @AfterPropertiesSet y no trabajar demasiado!

Alguna idea ?

Gracias

rjdkolb:

La respuesta es sencilla, pero me tomó casi un día de averiguar los métodos decoradas con @Cacheable no tienen ningún efecto en un @PostConstruct

Simplemente reemplazar su @PostConstruct con un @EventListener (ApplicationReadyEvent.class)

@EventListener(ApplicationReadyEvent.class)
public void init() {
    studentService.getStudentByID("1");
}

Nota: Si una excepción es lanzada desde un método decorado con @PostConstruct o EventListener evento (ApplicationReadyEvent.class) su aplicación con accidente ...