Spring Boot H2 控制台返回 404

Question

我有一个简单的 Springboot 应用程序并且它正在运行。我可以通过 Postman 调用 REST 端点。但是，当我尝试使用 http://localhost:8080/h2 访问控制台时，它一直返回 404。

2020-08-29 08:06:37.577  INFO 6507 --- [           main] o.hibernate.jpa.internal.util.LogHelper  : HHH000204: Processing PersistenceUnitInfo [

        name: default

        ...]

2020-08-29 08:06:37.644  INFO 6507 --- [           main] org.hibernate.Version                    : HHH000412: Hibernate Core {5.2.17.Final}

2020-08-29 08:06:37.645  INFO 6507 --- [           main] org.hibernate.cfg.Environment            : HHH000206: hibernate.properties not found

2020-08-29 08:06:37.677  INFO 6507 --- [           main] o.hibernate.annotations.common.Version   : HCANN000001: Hibernate Commons Annotations {5.0.1.Final}

2020-08-29 08:06:37.787  INFO 6507 --- [           main] org.hibernate.dialect.Dialect            : HHH000400: Using dialect: org.hibernate.dialect.H2Dialect

2020-08-29 08:06:38.247  INFO 6507 --- [           main] j.LocalContainerEntityManagerFactoryBean : Initialized JPA EntityManagerFactory for persistence unit 'default'

2020-08-29 08:06:38.737  INFO 6507 --- [           main] o.s.j.e.a.AnnotationMBeanExporter        : Registering beans for JMX exposure on startup

2020-08-29 08:06:38.738  INFO 6507 --- [           main] o.s.j.e.a.AnnotationMBeanExporter        : Bean with name 'dataSource' has been autodetected for JMX exposure

2020-08-29 08:06:38.741  INFO 6507 --- [           main] o.s.j.e.a.AnnotationMBeanExporter        : Located MBean 'dataSource': registering with JMX server as MBean [com.zaxxer.hikari:name=dataSource,type=HikariDataSource]

2020-08-29 08:06:38.813  INFO 6507 --- [ctor-http-nio-1] r.ipc.netty.tcp.BlockingNettyContext     : Started HttpServer on /0:0:0:0:0:0:0:0:8080

2020-08-29 08:06:38.813  INFO 6507 --- [           main] o.s.b.web.embedded.netty.NettyWebServer  : Netty started on port(s): 8080

2020-08-29 08:06:38.816  INFO 6507 --- [           main] c.v.t.c.m.tenant.discovery.Application   : Started Application in 3.4 seconds (JVM running for 3.661)

2020-08-29 08:06:48.527  WARN 6507 --- [ctor-http-nio-2] .a.w.r.e.DefaultErrorWebExceptionHandler : Failed to handle request [GET http://localhost:8080/h2]: Response status 404

2020-08-29 08:23:07.301  WARN 6507 --- [l-1 housekeeper] com.zaxxer.hikari.pool.HikariPool        : HikariPool-1 - Retrograde clock change detected (housekeeper delta=29s626ms), soft-evicting connections from pool.

2020-08-29 08:57:06.586  WARN 6507 --- [l-1 housekeeper] com.zaxxer.hikari.pool.HikariPool        : HikariPool-1 - Thread starvation or clock leap detected (housekeeper delta=33m59s284ms).

2020-08-29 09:35:49.699  WARN 6507 --- [l-1 housekeeper] com.zaxxer.hikari.pool.HikariPool        : HikariPool-1 - Thread starvation or clock leap detected (housekeeper 

我的 application.yml 文件看起来像这样。

spring:
  datasource:
    url: jdbc:h2:mem:test
    platform: h2
    username: sa
    password:
    driverClassName: org.h2.Driver
    hikari:
      maximum-pool-size: 50
  h2:
    console:
      enabled: true
      path: /h2
      settings:
        web-allow-others: true
  jpa:
    database-platform: org.hibernate.dialect.H2Dialect
    hibernate:
      ddl-auto: update
server:
  port: 8080

Answer 1

根据您的日志，我发现您使用的是嵌入式服务器，而不是 tomcat，即，spring-boot-starter-reactor-netty它与 spring webflux 依赖项一起提供。

H2ConsoleAutoConfiguration不会为 spring webflux 和 netty（基于反应器）执行，因为 H2 控制台仅可用于基于 servlet 的应用程序。因此，您必须在此 Spring Boot 应用程序中使用 spring webflux 和 netty 手动配置 H2 服务器。

示例 H2Server（工作代码）：

package com.example.springbootnettyserver;

import org.h2.tools.Server;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.event.ContextClosedEvent;
import org.springframework.context.event.ContextRefreshedEvent;
import org.springframework.context.event.EventListener;
import org.springframework.stereotype.Component;

import static org.h2.tools.Server.createWebServer;

    @Component
    public class H2ServerManual {
    
            Logger log = LoggerFactory.getLogger(H2ServerManual.class);
            private Server webServer;
    
            @Value("${h2-server.port}")
            Integer h2ConsolePort;
    
            @EventListener(ContextRefreshedEvent.class)
            public void start() throws java.sql.SQLException {
                log.info("starting h2 console at port "+ h2ConsolePort);
                this.webServer = createWebServer("-webPort", h2ConsolePort.toString(),
                                                 "-tcpAllowOthers").start();
                System.out.println(webServer.getURL());
            }
    
            @EventListener(ContextClosedEvent.class)
            public void stop() {
                log.info("stopping h2 console at port "+h2ConsolePort);
                this.webServer.stop();
            }
    }

注意：org.h2.tools.Server只有在没有运行时范围的情况下添加 h2 依赖项时，才会解析类。（删除依赖项的范围元素）

在 application.properties 中，您将为 h2 服务器添加端口详细信息，例如

h2-server:
 port: 8081

现在，H2 控制台将在 http://localhost:8081 上可用

可以删除以下属性

#  h2:
#    console:
#      enabled: true
#      path: /h2
#      settings:
#        web-allow-others: true

参考：https : //github.com/donthadineshkumar/webflux-netty-server-h2-example.git