Question

我正在尝试创建一个简单的Spring Boot项目，该项目使用spring data jpa进行数据库交互。

应用程序类：

package org.railway.fms.documentmgmt;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.domain.EntityScan;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;

@SpringBootApplication
@EnableJpaRepositories(basePackages = {"org.railway.fms.documentmgmt.repository"})
@EntityScan(basePackages= {"org.railway.fms.documentmgmt.entities"})
public class FMSApplication {

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

}

控制器类：

package org.railway.fms.documentmgmt;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class NatureOfDocumentRestService {

    @GetMapping("/document/nature")
    public String getNatureOfDocuments() {
        return "test";
    }
}

build.gradle文件：

buildscript {
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath("org.springframework.boot:spring-boot-gradle-plugin:2.1.4.RELEASE")
    }
}

apply plugin: 'java'
apply plugin: 'eclipse'
apply plugin: 'idea'
apply plugin: 'org.springframework.boot'
apply plugin: 'io.spring.dependency-management'

bootJar {
    baseName = 'document-mgmt'
    version =  '0.1.0'
}

repositories {
    mavenCentral()
}

sourceCompatibility = 1.8
targetCompatibility = 1.8

dependencies {
    compile ("org.springframework.boot:spring-boot-starter-web")
    implementation ("org.springframework.boot:spring-boot-starter-data-jpa")
    implementation ("org.postgresql:postgresql")
    testCompile("junit:junit")
}

application.properties

# Database
spring.datasource.url=jdbc:postgresql://localhost:5444/db?currentSchema=fms
spring.datasource.username=username
spring.datasource.password=password

# The SQL dialect makes Hibernate generate better SQL for the chosen database
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.PostgreSQLDialect

# Hibernate ddl auto (create, create-drop, validate, update)
spring.jpa.hibernate.ddl-auto = update

spring.jpa.show-sql=true

我面临的问题是，在build.gradle文件中不使用org.springframework.boot:spring-boot-starter-data-jpa依赖性时，我能够从浏览器成功命中控制器。

但是当我使用org.springframework.boot:spring-boot-starter-data-jpa时，该控制器未在spring上下文中加载，因此无法从浏览器中访问该控制器。

如何在包含公开Web服务的spring boot项目中使用spring-data-jpa，请帮忙！

注意：日志中没有错误，应用程序成功启动。

日志：

2019-06-10 09:52:11.348  INFO 15540 --- [           main] o.r.fms.documentmgmt.FMSApplication      : Starting FMSApplication on abcd with PID 15540 (C:\Users\furquan.ahmed\Workspaces\fmsWorkspace\document-mgmt\bin\main started by furquan.ahmed in C:\Users\furquan.ahmed\Workspaces\fmsWorkspace\document-mgmt)
2019-06-10 09:52:11.354  INFO 15540 --- [           main] o.r.fms.documentmgmt.FMSApplication      : No active profile set, falling back to default profiles: default
2019-06-10 09:52:12.200  INFO 15540 --- [           main] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data repositories in DEFAULT mode.
2019-06-10 09:52:12.228  INFO 15540 --- [           main] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 13ms. Found 0 repository interfaces.
2019-06-10 09:52:13.083  INFO 15540 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration' of type [org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration$$EnhancerBySpringCGLIB$$5149c32d] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2019-06-10 09:52:14.106  INFO 15540 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
2019-06-10 09:52:14.161  INFO 15540 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2019-06-10 09:52:14.162  INFO 15540 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.17]
2019-06-10 09:52:14.402  INFO 15540 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2019-06-10 09:52:14.402  INFO 15540 --- [           main] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 2968 ms
2019-06-10 09:52:14.714  INFO 15540 --- [           main] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Starting...
2019-06-10 09:52:18.002  INFO 15540 --- [           main] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Start completed.
2019-06-10 09:52:18.099  INFO 15540 --- [           main] o.hibernate.jpa.internal.util.LogHelper  : HHH000204: Processing PersistenceUnitInfo [
    name: default
    ...]
2019-06-10 09:52:18.267  INFO 15540 --- [           main] org.hibernate.Version                    : HHH000412: Hibernate Core {5.3.9.Final}
2019-06-10 09:52:18.268  INFO 15540 --- [           main] org.hibernate.cfg.Environment            : HHH000206: hibernate.properties not found
2019-06-10 09:52:18.494  INFO 15540 --- [           main] o.hibernate.annotations.common.Version   : HCANN000001: Hibernate Commons Annotations {5.0.4.Final}
2019-06-10 09:52:19.060  INFO 15540 --- [           main] org.hibernate.dialect.Dialect            : HHH000400: Using dialect: org.hibernate.dialect.PostgreSQLDialect

Answer 1

如果不需要直接为basePackages和@EnableJpaRepositories声明@EntityScan，我建议让Spring通过自动配置来找出位置，因为所有类位于org.railway.fms.documentmgmt：

@SpringBootApplication
@EnableJpaRepositories
public class FMSApplication { ... }

否则，请尝试添加@ComponentScan来说明Spring组件的位置：

@SpringBootApplication
@EnableJpaRepositories(basePackages = "org.railway.fms.documentmgmt.repository")
@EntityScan(basePackages= "org.railway.fms.documentmgmt.entities")
@ComponentScan(basePackages= "org.railway.fms.documentmgmt")
public class FMSApplication { ... }

此外，如果您确实需要说明基本软件包的位置，则还可以选择使用basePackageClasses代替basePackages，这是一种类型安全的选择。

Answer 2

您提到的

我面临的问题是在build.gradle文件中不使用org.springframework.boot：spring-boot-starter-data-jpa依赖项时，我能够从浏览器成功命中控制器。但是，当我使用org.springframework.boot：spring-boot-starter-data-jpa时，该控制器未在spring上下文中加载，因此无法从浏览器访问该控制器。

我认为，当您添加org.springframework.boot:spring-boot-starter-data-jpa时，您可能会忘记在application.properties中添加数据库配置。如果我是正确的，则在application.properties文件中添加以下属性，并用特定于您的数据库的值替换

spring.jpa.hibernate.ddl-auto=create
spring.datasource.url=jdbc:mysql://localhost:3306/db_example
spring.datasource.username=springuser
spring.datasource.password=ThePassword

如果您已经添加了这些属性。您能否提供日志和堆栈跟踪信息以查看您遇到了什么错误。

Answer 3

尝试在application.properties文件中定义以下属性。

server.servlet.context-path
spring.data.rest.base-path

现在使用上下文路径访问控制器映射，并使用rest.base-path访问其余存储库映射。

@RestController不适用于spring-data-jpa启动器

3 个答案: