SpringBoot2.4.5和Java11的模块系统问题

在上面的示例中，我在类路径上有spring.boot.starter.web，但应用程序启动失败。如果我添加org.apache.tomcat.embed.core，那么应用程序将成功启动

当我这样配置module-info.java时

requires spring.boot;
requires spring.boot.autoconfigure;
requires spring.web;
requires spring.boot.starter.web;

2021-05-20 10:56:09.501  INFO 17112 --- [           main] com.example.police.PoliceApplication     : Starting PoliceApplication using Java 11 on zhaozhiguang-pc with PID 17112 (D:\item\police\target\classes started by zhaozhiguang in D:\item\police)
2021-05-20 10:56:09.501  INFO 17112 --- [           main] com.example.police.PoliceApplication     : No active profile set, falling back to default profiles: default
2021-05-20 10:56:10.565  INFO 17112 --- [           main] com.example.police.PoliceApplication     : Started PoliceApplication in 1.435 seconds (JVM running for 3.153)

Process finished with exit code 0

我猜Tomcat没有开机

或

这个成功了

2021-05-20 10:57:48.097  INFO 13740 --- [           main] o.s.s.concurrent.ThreadPoolTaskExecutor  : Initializing ExecutorService 'applicationTaskExecutor'
2021-05-20 10:57:48.334  INFO 13740 --- [           main] o.s.b.a.e.web.EndpointLinksResolver      : Exposing 2 endpoint(s) beneath base path '/actuator'
2021-05-20 10:57:48.381  INFO 13740 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''
2021-05-20 10:57:48.396  INFO 13740 --- [           main] com.example.police.PoliceApplication     : Started PoliceApplication in 2.001 seconds (JVM running for 3.202)
2021-05-20 10:57:48.846  INFO 13740 --- [)-192.168.1.107] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring DispatcherServlet 'dispatcherServlet'
2021-05-20 10:57:48.846  INFO 13740 --- [)-192.168.1.107] o.s.web.servlet.DispatcherServlet        : Initializing Servlet 'dispatcherServlet'
2021-05-20 10:57:48.847  INFO 13740 --- [)-192.168.1.107] o.s.web.servlet.DispatcherServlet        : Completed initialization in 1 ms

为什么?

---

spring.boot.starter.web依赖于org.apache.tomcat.embed.core？

spring boot的主要功能之一是自动配置，这意味着它可以配置可用的功能

然而，对于Java模块，“可用”不仅取决于类路径上的jar，还取决于使用

requires

语句授予的访问权限

如果没有

requires

语句，Spring Boot的自动配置将无法看到Tomcat，因此它甚至不会尝试配置它

---

结果：自动忽略该功能。

Spring Boot的一个主要功能是自动配置，这意味着它可以配置可用的功能

然而，对于Java模块，“可用”不仅取决于类路径上的jar，还取决于使用

requires

语句授予的访问权限

如果没有

requires

语句，Spring Boot的自动配置将无法看到Tomcat，因此它甚至不会尝试配置它

---

结果：自动忽略该功能。

谢谢，那么我需要做什么？我还将使用其他JAR或功能，我可能不知道出了什么问题，对吧。这个add“requires org.apache.tomcat.embed.core”是我在其他地方找到的，谢谢，那么我需要做什么呢？我还将使用其他JAR或功能，我可能不知道出了什么问题，对吧。这个添加“requires org.apache.tomcat.embed.core”是我在其他地方找到的

2021-05-20 10:57:48.097  INFO 13740 --- [           main] o.s.s.concurrent.ThreadPoolTaskExecutor  : Initializing ExecutorService 'applicationTaskExecutor'
2021-05-20 10:57:48.334  INFO 13740 --- [           main] o.s.b.a.e.web.EndpointLinksResolver      : Exposing 2 endpoint(s) beneath base path '/actuator'
2021-05-20 10:57:48.381  INFO 13740 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''
2021-05-20 10:57:48.396  INFO 13740 --- [           main] com.example.police.PoliceApplication     : Started PoliceApplication in 2.001 seconds (JVM running for 3.202)
2021-05-20 10:57:48.846  INFO 13740 --- [)-192.168.1.107] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring DispatcherServlet 'dispatcherServlet'
2021-05-20 10:57:48.846  INFO 13740 --- [)-192.168.1.107] o.s.web.servlet.DispatcherServlet        : Initializing Servlet 'dispatcherServlet'
2021-05-20 10:57:48.847  INFO 13740 --- [)-192.168.1.107] o.s.web.servlet.DispatcherServlet        : Completed initialization in 1 ms