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@Foxik1

Почему Spring не видит сервер MySql?

MainController
package com.example.ordersbackend.controllers

import org.springframework.beans.factory.annotation.Autowired
import org.springframework.stereotype.Controller
import org.springframework.web.bind.annotation.GetMapping
import org.springframework.web.bind.annotation.ResponseBody


@Controller
class MainController {
    @Autowired
    private lateinit var postRepository: PostRepository

    @GetMapping("/")
    @ResponseBody
    open fun getAllUsers(): MutableIterable<Any?> {
        // This returns a JSON or XML with the users
        return postRepository.findAll()
    }
}

PostRepository

package com.example.ordersbackend.controllers;

import org.springframework.data.repository.CrudRepository;

public interface PostRepository extends CrudRepository {
}


Post
package com.example.ordersbackend.models

import jakarta.persistence.*

@Entity
@Table(name = "posts")
class Post {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private var id: Short? = null

    var title: String = ""

    fun getId(): Short? {
        return id
    }

    fun setId(id: Short) {
        this.id = id
    }

    fun getTitle(): String {
        return title
    }

    fun setTitle(title: String) {
        this.title = title
    }
}

application.properties
spring.jpa.hibernate.ddl-auto=update
spring.datasource.url=jdbc:mysql://${MYSQL_HOST:localhost}:3306/posts
spring.datasource.username=
spring.datasource.password=
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.jpa.show-sql: true

Ошибки
java.lang.IllegalArgumentException: Could not resolve domain type of interface com.example.ordersbackend.controllers.PostRepository
	at org.springframework.data.repository.core.support.DefaultRepositoryMetadata.resolveTypeParameter(DefaultRepositoryMetadata.java:79) ~[spring-data-commons-3.1.1.jar:3.1.1]
	at org.springframework.data.repository.core.support.DefaultRepositoryMetadata.<init>(DefaultRepositoryMetadata.java:58) ~[spring-data-commons-3.1.1.jar:3.1.1]
	at org.springframework.data.repository.core.support.AbstractRepositoryMetadata.getMetadata(AbstractRepositoryMetadata.java:77) ~[spring-data-commons-3.1.1.jar:3.1.1]
	at org.springframework.data.repository.config.RepositoryConfigurationExtensionSupport.getRepositoryConfigurations(RepositoryConfigurationExtensionSupport.java:91) ~[spring-data-commons-3.1.1.jar:3.1.1]
	at org.springframework.data.repository.config.RepositoryConfigurationDelegate.registerRepositoriesIn(RepositoryConfigurationDelegate.java:163) ~[spring-data-commons-3.1.1.jar:3.1.1]
	at org.springframework.data.repository.config.RepositoryBeanDefinitionRegistrarSupport.registerBeanDefinitions(RepositoryBeanDefinitionRegistrarSupport.java:94) ~[spring-data-commons-3.1.1.jar:3.1.1]
	at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.lambda$loadBeanDefinitionsFromRegistrars$1(ConfigurationClassBeanDefinitionReader.java:373) ~[spring-context-6.0.10.jar:6.0.10]
	at java.base/java.util.LinkedHashMap.forEach(LinkedHashMap.java:721) ~[na:na]
	at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.loadBeanDefinitionsFromRegistrars(ConfigurationClassBeanDefinitionReader.java:372) ~[spring-context-6.0.10.jar:6.0.10]
	at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.loadBeanDefinitionsForConfigurationClass(ConfigurationClassBeanDefinitionReader.java:148) ~[spring-context-6.0.10.jar:6.0.10]
	at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.loadBeanDefinitions(ConfigurationClassBeanDefinitionReader.java:120) ~[spring-context-6.0.10.jar:6.0.10]
	at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:427) ~[spring-context-6.0.10.jar:6.0.10]
	at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:287) ~[spring-context-6.0.10.jar:6.0.10]
	at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java:344) ~[spring-context-6.0.10.jar:6.0.10]
	at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:115) ~[spring-context-6.0.10.jar:6.0.10]
	at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:771) ~[spring-context-6.0.10.jar:6.0.10]
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:589) ~[spring-context-6.0.10.jar:6.0.10]
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:146) ~[spring-boot-3.1.1.jar:3.1.1]
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:734) ~[spring-boot-3.1.1.jar:3.1.1]
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:436) ~[spring-boot-3.1.1.jar:3.1.1]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:312) ~[spring-boot-3.1.1.jar:3.1.1]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1306) ~[spring-boot-3.1.1.jar:3.1.1]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1295) ~[spring-boot-3.1.1.jar:3.1.1]
	at com.example.ordersbackend.OrdersBackendApplicationKt.main(OrdersBackendApplication.kt:18) ~[classes/:na]
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) ~[na:na]
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
	at java.base/java.lang.reflect.Method.invoke(Method.java:568) ~[na:na]
	at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:50) ~[spring-boot-devtools-3.1.1.jar:3.1.1]
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Ответы на вопрос 1
xez
@xez
TL Junior Roo
Похоже, спрингу надо подсказать, что вы расчитываете на этот интерфейс.
Попробуйте использовать аннотации @EnableJpaRepositories(…) и
@EntityScan(…). В скобочках надо будет указать пэкедж репозитория и дэтэошек соотвественно.
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