java - @SpringBootApplication 注解未在类路径中找到 bean
问题描述
根据我的理解, using@SpringBootApplication
相当于拥有@EnableAutoConfiguration
and @ComponentScan
。出于这个原因,我不明白为什么 Spring 没有找到我的注释。据我所知,项目结构是应有的,并且所有内容都已正确注释。但是,当我访问映射的端点http://localhost:8080/dashboard
或http://localhost:8080/dashboard/
时,我看到 404 错误。
我刚刚使用 IntelliJ 内置的 Spring Initialiser 创建了一个新的 Spring Boot 项目,我选择了 Spring Web 和一些用于 Postgres 的组件。在项目中,我找不到任何其他用于配置的 .xml 文件。但是,我确实发现:
DataSourceInitializerInvoker.java - which hasn't been edited
ConfigurationPropertiesAutoConfiguration.java - which hasn't been edited
我的项目结构如下:
com
+-abcde
+-appname
+-controllers
DashboardController.java
Application.java
应用程序.java:
package com.abcde.appname;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}
仪表板控制器.java
package com.abcde.appname.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.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
@Controller
@RequestMapping("/dashboard")
public class DashboardController {
@Autowired
public DashboardController() {
}
@GetMapping
public ModelAndView renderDashboard() {
return new ModelAndView("dashboard/index");
}
}
除了这些文件,我还有以下内容,
应用程序属性
spring.datasource.url=jdbc:postgresql://localhost:5432/postgres
spring.datasource.username=user
spring.datasource.driver-class-name=org.postgresql.Driver
spring.main.banner-mode=off
构建.gradle
plugins {
id 'org.springframework.boot' version '2.3.3.RELEASE'
id 'io.spring.dependency-management' version '1.0.10.RELEASE'
id 'java'
}
group = 'com.abcde'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = '14'
repositories {
mavenCentral()
}
dependencies {
implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
implementation 'org.springframework.boot:spring-boot-starter-freemarker'
implementation 'org.springframework.boot:spring-boot-starter-web'
implementation 'org.flywaydb:flyway-core'
runtimeOnly 'org.postgresql:postgresql'
testImplementation('org.springframework.boot:spring-boot-starter-test') {
exclude group: 'org.junit.vintage', module: 'junit-vintage-engine'
}
}
test {
useJUnitPlatform()
}
堆栈跟踪
2020-09-09 23:24:46.053 INFO 57966 --- [ main] c.d.f.Application : Starting Application on OP-MacBook-Pro.local with PID 57966 (/Users/op/IdeaProjects/lalala/build/classes/java/main started by op in /Users/op/IdeaProjects/lalala)
2020-09-09 23:24:46.054 INFO 57966 --- [ main] c.d.f.Application : No active profile set, falling back to default profiles: default
2020-09-09 23:24:46.374 INFO 57966 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data JPA repositories in DEFERRED mode.
2020-09-09 23:24:46.388 INFO 57966 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 10ms. Found 0 JPA repository interfaces.
2020-09-09 23:24:46.716 INFO 57966 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2020-09-09 23:24:46.720 INFO 57966 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2020-09-09 23:24:46.720 INFO 57966 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.37]
2020-09-09 23:24:46.775 INFO 57966 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2020-09-09 23:24:46.775 INFO 57966 --- [ main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 700 ms
2020-09-09 23:24:46.832 INFO 57966 --- [ main] o.f.c.internal.license.VersionPrinter : Flyway Community Edition 6.4.4 by Redgate
2020-09-09 23:24:46.835 INFO 57966 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Starting...
2020-09-09 23:24:46.872 INFO 57966 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Start completed.
2020-09-09 23:24:46.879 INFO 57966 --- [ main] o.f.c.internal.database.DatabaseFactory : Database: jdbc:postgresql://localhost:5432/postgres (PostgreSQL 12.3)
2020-09-09 23:24:46.901 INFO 57966 --- [ main] o.f.core.internal.command.DbValidate : Successfully validated 1 migration (execution time 00:00.011s)
2020-09-09 23:24:46.905 INFO 57966 --- [ main] o.f.core.internal.command.DbMigrate : Current version of schema "public": 10
2020-09-09 23:24:46.905 INFO 57966 --- [ main] o.f.core.internal.command.DbMigrate : Schema "public" is up to date. No migration necessary.
2020-09-09 23:24:46.960 INFO 57966 --- [ main] o.s.s.concurrent.ThreadPoolTaskExecutor : Initializing ExecutorService 'applicationTaskExecutor'
2020-09-09 23:24:46.985 INFO 57966 --- [ task-1] o.hibernate.jpa.internal.util.LogHelper : HHH000204: Processing PersistenceUnitInfo [name: default]
2020-09-09 23:24:47.000 WARN 57966 --- [ main] JpaBaseConfiguration$JpaWebConfiguration : spring.jpa.open-in-view is enabled by default. Therefore, database queries may be performed during view rendering. Explicitly configure spring.jpa.open-in-view to disable this warning
2020-09-09 23:24:47.010 INFO 57966 --- [ task-1] org.hibernate.Version : HHH000412: Hibernate ORM core version 5.4.20.Final
2020-09-09 23:24:47.070 INFO 57966 --- [ task-1] o.hibernate.annotations.common.Version : HCANN000001: Hibernate Commons Annotations {5.1.0.Final}
2020-09-09 23:24:47.122 INFO 57966 --- [ task-1] org.hibernate.dialect.Dialect : HHH000400: Using dialect: org.hibernate.dialect.PostgreSQL10Dialect
2020-09-09 23:24:47.253 INFO 57966 --- [ task-1] o.h.e.t.j.p.i.JtaPlatformInitiator : HHH000490: Using JtaPlatform implementation: [org.hibernate.engine.transaction.jta.platform.internal.NoJtaPlatform]
2020-09-09 23:24:47.257 INFO 57966 --- [ task-1] j.LocalContainerEntityManagerFactoryBean : Initialized JPA EntityManagerFactory for persistence unit 'default'
2020-09-09 23:24:47.264 INFO 57966 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2020-09-09 23:24:47.265 INFO 57966 --- [ main] DeferredRepositoryInitializationListener : Triggering deferred initialization of Spring Data repositories…
2020-09-09 23:24:47.266 INFO 57966 --- [ main] DeferredRepositoryInitializationListener : Spring Data repositories initialized!
2020-09-09 23:24:47.273 INFO 57966 --- [ main] c.d.f.lalala : Started Application in 1.401 seconds (JVM running for 1.885)
2020-09-09 23:24:49.520 INFO 57966 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring DispatcherServlet 'dispatcherServlet'
2020-09-09 23:24:49.520 INFO 57966 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Initializing Servlet 'dispatcherServlet'
2020-09-09 23:24:49.524 INFO 57966 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Completed initialization in 4 ms
对此问题的任何见解将不胜感激。非常感谢
解决方案
它可能成功调用了 renderDashboard() 并且没有找到“仪表板/索引”。您可以通过调试和设置断点或添加 log/System.out println 语句来验证这一点。您的索引文件是否存在并且设置是否正确?
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