找不到Spring Boot模块错误 [英] Spring Boot module not found error

问题描述

我正在Java 9上创建Spring Boot应用程序.如果我在pom.xml中按如下所示保留父项:

I am creating a Spring Boot application on Java 9. If I keep parent as below in pom.xml:

<parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.1.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
</parent>

和module-info.java为:

module com.journaldev.spring.SpringWebflux {
    requires reactor.core;
    requires spring.web;
    requires spring.context;
    requires spring.webflux;
    requires spring.boot;
    requires spring.boot.autoconfigure;
}

然后由于找不到模块而出现错误.

Then I get errors as module not found.

module-info.java:[2,21] module not found: reactor.core
module-info.java:[3,20] module not found: spring.web
module-info.java:[4,20] module not found: spring.context
module-info.java:[5,20] module not found: spring.webflux
module-info.java:[6,20] module not found: spring.boot
module-info.java:[7,25] module not found: spring.boot.autoconfigure

如果我将spring-boot-starter-parent版本降低到2.0.0.RELEASE，则此错误消失了.我想了解为什么?

If I lower the spring-boot-starter-parent version to 2.0.0.RELEASE then this error is gone. I am trying to understand why?

推荐答案

如注释中所述，该jar文件已损坏(当您升级到较新版本时，可能会发生这种情况，而在网络级别则发生了一些问题).通常，从Maven或Gradle缓存中清除该漏洞就可以解决该问题.

As discussed in the comments, the jar was corrupted (which can happen when you upgrade to a newer version and something wrong happened at network level). Clearing that from the maven or gradle cache is usually enough to get rid of the problem.

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