本地主机：8080，在 Spring Boot 应用程序中显示 404 错误

时间：2021-07-11 07:07:42

标签： java spring spring-boot tomcat microservices

我在 Spring Boot 微服务方面遇到了一些问题，我已经能够将微服务成功连接到在 Google Cloud 上运行的 SQL 实例，但是由于某种原因，当我尝试使用示例端点只返回一个字符串“工作”我得到一个 404 未找到错误，我还尝试了一个示例空白项目，除了启动和运行 Spring Boot 所需的那些之外，没有任何依赖，但是我仍然面临同样的问题，即我收到 404 Not Found 错误，即使它正确编译和运行。我检查了我的防火墙，它没有阻止该服务。

这里是控制器

VideoController.java

package com.example.demo.Controllers;

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

@RestController
public class VideoController {


    @RequestMapping(path = "/test")
    public String index() {
        return "Greetings from Spring Boot!";
    }
}

运行日志

    2021-07-11 16:53:28.677  INFO 16456 --- [           main] com.example.demo.Run.DemoApplication     : Starting DemoApplication using Java 15.0.2 on DESKTOP-OO1339O with PID 16456 (C:\Users\Engineering\IdeaProjects\gcp-demo\build\classes\java\main started by Engineering in C:\Users\Engineering\IdeaProjects\gcp-demo)
2021-07-11 16:53:28.679  INFO 16456 --- [           main] com.example.demo.Run.DemoApplication     : No active profile set, falling back to default profiles: default
2021-07-11 16:53:29.149  INFO 16456 --- [           main] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data JPA repositories in DEFAULT mode.
2021-07-11 16:53:29.161  INFO 16456 --- [           main] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 5 ms. Found 0 JPA repository interfaces.
2021-07-11 16:53:29.510  INFO 16456 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
2021-07-11 16:53:29.517  INFO 16456 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2021-07-11 16:53:29.517  INFO 16456 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.48]
2021-07-11 16:53:29.624  INFO 16456 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2021-07-11 16:53:29.625  INFO 16456 --- [           main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 913 ms
2021-07-11 16:53:29.751  INFO 16456 --- [           main] o.hibernate.jpa.internal.util.LogHelper  : HHH000204: Processing PersistenceUnitInfo [name: default]
2021-07-11 16:53:29.788  INFO 16456 --- [           main] org.hibernate.Version                    : HHH000412: Hibernate ORM core version 5.4.32.Final
2021-07-11 16:53:29.888  INFO 16456 --- [           main] o.hibernate.annotations.common.Version   : HCANN000001: Hibernate Commons Annotations {5.1.2.Final}
2021-07-11 16:53:29.971  INFO 16456 --- [           main] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Starting...
2021-07-11 16:53:30.025  INFO 16456 --- [           main] c.g.cloud.sql.core.CoreSocketFactory     : Connecting to Cloud SQL instance [XXXXXXXXHIDDENFROMSTACKOVERFLOWPOST] via SSL socket.
2021-07-11 16:53:30.025  INFO 16456 --- [           main] c.g.cloud.sql.core.CoreSocketFactory     : First Cloud SQL connection, generating RSA key pair.
2021-07-11 16:53:31.820  INFO 16456 --- [           main] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Start completed.
2021-07-11 16:53:31.835  INFO 16456 --- [           main] org.hibernate.dialect.Dialect            : HHH000400: Using dialect: org.hibernate.dialect.MySQL57Dialect
2021-07-11 16:53:31.924  INFO 16456 --- [onnection adder] c.g.cloud.sql.core.CoreSocketFactory     : Connecting to Cloud SQL instance [XXXXXXXXHIDDENFROMSTACKOVERFLOWPOST] via SSL socket.
2021-07-11 16:53:32.035  INFO 16456 --- [onnection adder] c.g.cloud.sql.core.CoreSocketFactory     : Connecting to Cloud SQL instance [XXXXXXXXHIDDENFROMSTACKOVERFLOWPOST] via SSL socket.
2021-07-11 16:53:32.040  INFO 16456 --- [           main] o.h.e.t.j.p.i.JtaPlatformInitiator       : HHH000490: Using JtaPlatform implementation: [org.hibernate.engine.transaction.jta.platform.internal.NoJtaPlatform]
2021-07-11 16:53:32.049  INFO 16456 --- [           main] j.LocalContainerEntityManagerFactoryBean : Initialized JPA EntityManagerFactory for persistence unit 'default'
2021-07-11 16:53:32.099  WARN 16456 --- [           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
2021-07-11 16:53:32.147  INFO 16456 --- [onnection adder] c.g.cloud.sql.core.CoreSocketFactory     : Connecting to Cloud SQL instance [XXXXXXXXHIDDENFROMSTACKOVERFLOWPOST] via SSL socket.
2021-07-11 16:53:32.245  INFO 16456 --- [onnection adder] c.g.cloud.sql.core.CoreSocketFactory     : Connecting to Cloud SQL instance [XXXXXXXXHIDDENFROMSTACKOVERFLOWPOST] via SSL socket.
2021-07-11 16:53:32.265  INFO 16456 --- [           main] c.g.c.s.core.DefaultCredentialsProvider  : Default credentials provider for service account acn-demo-app@involuted-earth-319307.iam.gserviceaccount.com
2021-07-11 16:53:32.265  INFO 16456 --- [           main] c.g.c.s.core.DefaultCredentialsProvider  : Scopes in use by default credentials: [https://www.googleapis.com/auth/pubsub, https://www.googleapis.com/auth/spanner.admin, https://www.googleapis.com/auth/spanner.data, https://www.googleapis.com/auth/datastore, https://www.googleapis.com/auth/sqlservice.admin, https://www.googleapis.com/auth/devstorage.read_only, https://www.googleapis.com/auth/devstorage.read_write, https://www.googleapis.com/auth/cloudruntimeconfig, https://www.googleapis.com/auth/trace.append, https://www.googleapis.com/auth/cloud-platform, https://www.googleapis.com/auth/cloud-vision, https://www.googleapis.com/auth/bigquery, https://www.googleapis.com/auth/monitoring.write]
2021-07-11 16:53:32.277  INFO 16456 --- [           main] c.g.c.s.a.c.GcpContextAutoConfiguration  : The default project ID is XXXXXXXXHIDDENFROMSTACKOVERFLOWPOST
2021-07-11 16:53:32.353  INFO 16456 --- [onnection adder] c.g.cloud.sql.core.CoreSocketFactory     : Connecting to Cloud SQL instance [XXXXXXXXHIDDENFROMSTACKOVERFLOWPOST] via SSL socket.
2021-07-11 16:53:32.378  INFO 16456 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''
2021-07-11 16:53:32.389  INFO 16456 --- [           main] com.example.demo.Run.DemoApplication     : Started DemoApplication in 4.027 seconds (JVM running for 4.567)
2021-07-11 16:53:32.449  INFO 16456 --- [onnection adder] c.g.cloud.sql.core.CoreSocketFactory     : Connecting to Cloud SQL instance [XXXXXXXXHIDDENFROMSTACKOVERFLOWPOST] via SSL socket.
2021-07-11 16:53:32.554  INFO 16456 --- [onnection adder] c.g.cloud.sql.core.CoreSocketFactory     : Connecting to Cloud SQL instance [XXXXXXXXHIDDENFROMSTACKOVERFLOWPOST] via SSL socket.
2021-07-11 16:53:32.659  INFO 16456 --- [onnection adder] c.g.cloud.sql.core.CoreSocketFactory     : Connecting to Cloud SQL instance [involuted-earth-319307:australia-southeast1:cloud-demo] via SSL socket.
2021-07-11 16:53:32.768  INFO 16456 --- [onnection adder] c.g.cloud.sql.core.CoreSocketFactory     : Connecting to Cloud SQL instance [XXXXXXXXHIDDENFROMSTACKOVERFLOWPOST] via SSL socket.
2021-07-11 16:53:38.167  INFO 16456 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring DispatcherServlet 'dispatcherServlet'
2021-07-11 16:53:38.167  INFO 16456 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : Initializing Servlet 'dispatcherServlet'
2021-07-11 16:53:38.168  INFO 16456 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : Completed initialization in 1 ms

我的应用程序属性文件

应用程序属性

  spring.main.allow-bean-definition-overriding=true
spring.datasource.url=SOMEVALUE HERE
spring.datasource.username=SOMEVALUE HERE
spring.datasource.password=SOMEVALUEHERE
spring.cloud.gcp.sql.database-name=SOMEVALUEHERE
spring.cloud.gcp.sql.instance-connection-name=SOMVEVALUEHERE
spring.jpa.show-sql=true
spring.jpa.hibernate.ddl-auto=update

我的文件结构

File Structure

我的应用程序运行类

DemoApplication.Java

package com.example.demo.Run;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class DemoApplication {

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

}

Postman Request

2 个答案:

答案 0 :(得分：1)

DemoApplication 位于 com.example.demo.Run 包中。这意味着它的组件扫描（通过 @SpringBootApplication 启用）将在 com.example.demo.Run 和任何子包（例如 com.example.demo.Run.example）中找到组件。因此，您的其余代码不在可以找到的包中。

我将通过将 DemoApplication 移到 com.example.demo 包中来解决此问题。这意味着可以找到任何现有 com.example.demo.* 包中的组件。

或者，您可以将 DemoApplication 留在原处并使用 scanBasePackages attribute on @SpringBootApplication 列出所有其他 com.example.demo.* 软件包。这将比移动 DemoApplication 更冗长，并且每次引入新包时都需要进行更改。

答案 1 :(得分：0)

正如你所说，你的第一个问题是因为你的主类和控制器类的包级别。但是第二个问题似乎并不依赖于重构主类。与你的JDK版本或其他库的版本冲突有关

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