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13.6 SpringBoot集成Mongodb开发问题@EnableMongoRepositories路径配置
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发布时间:2019-03-01

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13.6 SpringBoot集成Mongodb开发问题@EnableMongoRepositories路径配置


APPLICATION FAILED TO START


Description:

Parameter 0 of constructor in com.restfeel.controller.BlogController required a bean of type 'com.restfeel.biz.BlogService' that could not be found.

Action:

Consider defining a bean of type 'com.restfeel.biz.BlogService' in your configuration.

:bootRun FAILED

FAILURE: Build failed with an exception.

  • What went wrong:
    Execution failed for task ':bootRun'.

代码

package com.restfeel.serviceimport com.restfeel.entity.Blogimport org.springframework.data.mongodb.repository.MongoRepositoryimport org.springframework.data.mongodb.repository.Queryimport org.springframework.data.repository.query.Paraminterface BlogService : MongoRepository
{ @Query("{ 'title' : ?0 }") fun findByTitle(@Param("title") title: String): Iterable
}package com.restfeel.controllerimport com.restfeel.service.BlogServiceimport com.restfeel.entity.Blogimport org.springframework.boot.autoconfigure.EnableAutoConfigurationimport org.springframework.context.annotation.ComponentScanimport org.springframework.stereotype.Controllerimport org.springframework.transaction.annotation.Propagationimport org.springframework.transaction.annotation.Transactionalimport org.springframework.ui.Modelimport org.springframework.web.bind.annotation.GetMappingimport org.springframework.web.bind.annotation.RequestParamimport org.springframework.web.bind.annotation.ResponseBodyimport java.util.*/** * * 注意: * 这里要使用@Controller注解 * 而不要使用@RestController * 否则return "index";只是返回字符串"index", 不能跳转到index.html * * @RestController is a stereotype annotation that combines @ResponseBody and @Controller. * @RestController注解相当于@ResponseBody + @Controller合在一起的作用。 */@Controller@EnableAutoConfiguration@ComponentScan@Transactional(propagation = Propagation.REQUIRES_NEW)class BlogController(val blogService: BlogService) { @GetMapping("/blogs.do") fun listAll(model: Model): String { val now = Date(); blogService.save(Blog("SpringBoot极简教程", "XXX", "JasonChen", now, now, 0, now, "", 0)) blogService.save(Blog("SpringBoot极简教程", "XXX", "BluceLi", now, now, 0, now, "", 0)) blogService.save(Blog("SpringBoot极简教程", "XXX", "MichelleChen", now, now, 0, now, "", 0)) val allblogs = blogService.findAll() model.addAttribute("blogs", allblogs) return "jsp/blog/list" } @GetMapping("/listblogs") @ResponseBody fun listblogs(model: Model) = blogService.findAll() @GetMapping("/findBlog") @ResponseBody fun findBlog(@RequestParam(value = "title") title: String) = blogService.findByTitle(title)}

原因

@EnableMongoRepositories路径配置问题,AbstractMongoConfiguration扫描dao层包路径的配置要细心。

package com.restfeel.configimport com.mongodb.Mongoimport com.mongodb.MongoClientimport com.mongodb.MongoCredentialimport com.mongodb.ServerAddressimport org.springframework.beans.factory.annotation.Autowiredimport org.springframework.context.annotation.Beanimport org.springframework.context.annotation.Configurationimport org.springframework.core.env.Environmentimport org.springframework.data.mongodb.config.AbstractMongoConfigurationimport org.springframework.data.mongodb.repository.config.EnableMongoRepositories/** * Created by jack on 2017/3/29. */@Configuration@EnableMongoRepositories(*arrayOf("com.restfeel.dao", "com.???.???"))class PersistenceConfig : AbstractMongoConfiguration() {    @Autowired    private val env: Environment? = null    override fun getDatabaseName(): String {        return env!!.getProperty("mongodb.name")    }    @Bean    @Throws(Exception::class)    override fun mongo(): Mongo {        return MongoClient(listOf(ServerAddress(env!!.getProperty("mongodb.host"), env!!.getProperty("mongodb.port", Int::class.java))),                listOf(MongoCredential                        .createCredential(env!!.getProperty("mongodb.username"), env!!.getProperty("mongodb.name"),                                env!!.getProperty("mongodb.password").toCharArray())))    }//    override fun getMappingBasePackage(): String {//        return "com.restfiddle.dao"//    }    /**     * 这地方是配置扫描继承Repository类的所有接口类的路径的,路径配置错误,bean就不会创建了。     * 东海陈光剑 Jason Chen @蒋村花园如意苑 2017.3.30 01:41:35     */    override fun getMappingBasePackages(): Collection
{ return setOf("com.restfeel.dao", "com.restfeel.service") }}

原理

比如说,有代码

@Autowiredprivate UserDao userDao;

其中UserDao来自

public interface UserDao extends CrudRepository

无论在哪儿也找不到这个Bean是在哪儿定义的,但是代码还能正常工作。@Autowired 默认找不到会报错,再不然就是null,不会创建bean。

我们正常会推测:这是 CrudRepository导致的, CrudRepository会自动创建一个Bean。事实如此,这个是spring data jpa的功能,它会扫描Repository的子类并实现它们

转载地址:http://uaha.baihongyu.com/

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