带有 H2 的 Spring boot - 不是托管类型答案

【问题标题】：Spring boot with H2 - Not a managed type带有 H2 的 Spring boot - 不是托管类型
【发布时间】：2023-01-04 20:39:03
【问题描述】：

我在启动 Spring Boot 应用程序时遇到问题：

Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'coffeeService': Unsatisfied dependency expressed through field 'coffeeRepository': Error creating bean with name 'coffeeRepository' defined in com.coffeetime.coffeeshop.repository.CoffeeRepository defined in @EnableJpaRepositories declared on CoffeeshopApplication: Not a managed type: class com.coffeetime.coffeeshop.domain.Coffee
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'coffeeRepository' defined in com.coffeetime.coffeeshop.repository.CoffeeRepository defined in @EnableJpaRepositories declared on CoffeeshopApplication: Not a managed type: class com.coffeetime.coffeeshop.domain.Coffee
Caused by: java.lang.IllegalArgumentException: Not a managed type: class com.coffeetime.coffeeshop.domain.Coffee

Spring Bot 的版本是 3.0，Java 是 17（最更新的来自 Initialzr）。我想使用 H2 作为内存数据库：

<dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
    </dependency>
    <dependency>
        <groupId>javax.persistence</groupId>
        <artifactId>javax.persistence-api</artifactId>
        <version>2.2</version>
    </dependency>
    <dependency>
        <groupId>com.h2database</groupId>
        <artifactId>h2</artifactId>
        <scope>runtime</scope>
    </dependency>

包层次结构便于扫描实体。所以，我认为没有必要添加@EntityScan（我也试过了）

File structure

这是 application.properties：

spring.datasource.url=jdbc:h2:mem:coffeeshopdb
spring.datasource.driverClassName=org.h2.Driver
spring.datasource.username=sa
spring.datasource.password=pass1234
spring.jpa.database-platform=org.hibernate.dialect.H2Dialect

spring.jpa.show-sql=true
spring.h2.console.enabled=true

spring.jpa.defer-datasource-initialization=true

资料库

import org.springframework.data.jpa.repository.JpaRepository;
import com.coffeetime.coffeeshop.domain.Coffee;

public interface CoffeeRepository extends JpaRepository<Coffee, Long>{

}

和实体：

@Entity
@Table(name = "coffee")
public class Coffee {
    
    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    private Long id;
    
    @Column(name = "name")
    @NotEmpty(message = "Coffee name cannot be empty")
    private String name;
    
    @Column(name = "amount")
    @NotNull(message = "Coffee price cannot be empty")
    @Min(value = 0, message = "Coffee price must be greater than or equal to 0")
    private BigDecimal amount;

    public Long getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

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

    public BigDecimal getAmount() {
        return amount;
    }

    public void setAmount(BigDecimal amount) {
        this.amount = amount;
    }
}

我在这个线程中检查了the similar problem，没有任何答案有效。我怀疑H2。

谢谢

我尝试使用 @EntityScan 并使用 application.properties。但仍然是同样的错误。

【问题讨论】：

标签： spring-boot spring-data-jpa spring-data h2

【解决方案1】：

我发现了问题。 Spring Boot 3.0.0 版本开始使用 jakarta 而不是 javax.persistence。重组进口解决了这个问题。

【讨论】：