Question

我很难理解这些错误的含义，更不用说开始解决它们了。我正在尝试将Java平台模块（使用jdk 14）与一个简单的“基于渐变的多模块”项目一起使用（一切都与jdk 8完美配合）。该项目使用spring-boot和spring-data-jdbc。其实我的核心依赖项是

implementation 'org.springframework.boot:spring-boot-starter-data-jdbc'
implementation 'org.springframework.boot:spring-boot-starter-freemarker'
implementation 'org.springframework.boot:spring-boot-starter-web'
implementation 'org.projectlombok:lombok'

虽然我在每个项目源根目录中都添加了module-info.java，但是我的IDE（intellJ）非常友好，可以提示我要导出/需要哪些模块，并且在尝试编译之前，所有模块看起来都很不错。

我在此处包括指向此问题的主题项目的git repo链接-https://github.com/m41na/todo-modules-demo

如果您遇到这些（或类似的）问题，能否请您阐明如何解决这些问题？

error: the unnamed module reads package org.springframework.data.jdbc.core.convert from both spring.data.jdbc and spring.data.relational
error: module spring.context reads package org.springframework.data.jdbc.core.convert from both spring.data.relational and spring.data.jdbc
error: module spring.boot.starter.data.jdbc reads package org.springframework.data.jdbc.core.convert from both spring.data.relational and spring.data.jdbc
error: module spring.boot.starter.jdbc reads package org.springframework.data.jdbc.core.convert from both spring.data.relational and spring.data.jdbc
error: module spring.data.jdbc reads package org.springframework.data.jdbc.core.convert from both spring.data.relational and spring.data.jdbc
error: module spring.boot.starter reads package org.springframework.data.jdbc.core.convert from both spring.data.relational and spring.data.jdbc
error: module spring.jdbc reads package org.springframework.data.jdbc.core.convert from both spring.data.relational and spring.data.jdbc
error: module spring.tx reads package org.springframework.data.jdbc.core.convert from both spring.data.relational and spring.data.jdbc
error: module spring.boot.autoconfigure reads package org.springframework.data.jdbc.core.convert from both spring.data.relational and spring.data.jdbc
error: module spring.boot reads package org.springframework.data.jdbc.core.convert from both spring.data.relational and spring.data.jdbc
error: module spring.aop reads package org.springframework.data.jdbc.core.convert from both spring.data.relational and spring.data.jdbc
error: module spring.expression reads package org.springframework.data.jdbc.core.convert from both spring.data.relational and spring.data.jdbc
the unnamed module reads package org.springframework.data.jdbc.core.convert from both spring.data.jdbc and spring.data.relational

error: module spring.core reads package org.springframework.data.jdbc.core.convert from both spring.data.relational and spring.data.jdbc
error: module spring.boot.starter.logging reads package org.springframework.data.jdbc.core.convert from both spring.data.relational and spring.data.jdbc
error: module logback.classic reads package org.springframework.data.jdbc.core.convert from both spring.data.relational and spring.data.jdbc
error: module org.apache.logging.slf4j reads package org.springframework.data.jdbc.core.convert from both spring.data.relational and spring.data.jdbc
module spring.context reads package org.springframework.data.jdbc.core.convert from both spring.data.relational and spring.data.jdbc

error: module jul.to.slf4j reads package org.springframework.data.jdbc.core.convert from both spring.data.relational and spring.data.jdbc
error: module org.slf4j reads package org.springframework.data.jdbc.core.convert from both spring.data.relational and spring.data.jdbc
module spring.boot.starter.data.jdbc reads package org.springframework.data.jdbc.core.convert from both spring.data.relational and spring.data.jdbc

error: module java.annotation reads package org.springframework.data.jdbc.core.convert from both spring.data.relational and spring.data.jdbc
module spring.boot.starter.jdbc reads package org.springframework.data.jdbc.core.convert from both spring.data.relational and spring.data.jdbc

error: module org.yaml.snakeyaml reads package org.springframework.data.jdbc.core.convert from both spring.data.relational and spring.data.jdbc
error: module spring.jcl reads package org.springframework.data.jdbc.core.convert from both spring.data.relational and spring.data.jdbc
module spring.data.jdbc reads package org.springframework.data.jdbc.core.convert from both spring.data.relational and spring.data.jdbc

error: module logback.core reads package org.springframework.data.jdbc.core.convert from both spring.data.relational and spring.data.jdbc
error: module spring.beans reads package org.springframework.data.jdbc.core.convert from both spring.data.relational and spring.data.jdbc
module spring.boot.starter reads package org.springframework.data.jdbc.core.convert from both spring.data.relational and spring.data.jdbc

error: module spring.data.relational reads package org.springframework.data.jdbc.core.convert from both spring.data.jdbc and spring.data.relational
module spring.jdbc reads package org.springframework.data.jdbc.core.convert from both spring.data.relational and spring.data.jdbc

error: module spring.data.commons reads package org.springframework.data.jdbc.core.convert from both spring.data.relational and spring.data.jdbc
module spring.tx reads package org.springframework.data.jdbc.core.convert from both spring.data.relational and spring.data.jdbc

Answer 1

TL; DR -我已经使用split packages Gradle插件解决了in this clone of your project错误mrJar，^{< em> 1}。

漫长的答案

„ ...我在粗略地解释这些错误的含义... ”

欢迎来到split packages的世界……

„ …“拆分软件包”是一个古老的Java术语，其中两个名称相同的软件包存在于不同的库/应用程序中。由于可靠的配置，Java 9不允许在不同的模块中拆分软件包……”

该引号来自this blog。

„ ...如果您遇到这些（或类似的）问题... ”

several other Stack Overflow questions证明，拆分包对于任何将其项目构造为JPMS模块的人都是不可避免的。

„ ...您能否说明一下如何解决这些问题？... ”

回到 TL; DR ，我已经通过应用我建议的插件解决了项目拆分包的问题。 Download and build the demo检查结果。

正如我在该演示文档中提到的那样，Java 14 ⁺支持将在第二天或第二天添加到该插件中。尽快，我将更新演示并编辑此答案。但是我想而不是等到那时，您（和其他感兴趣的潜伏者）今天可以从版本0.0.16的JDK 13支持中受益。

Another solution I recently proposed是Mark Reinhold建议的“ Bridges to the class path”方法的实现。我在评论中提到的数字2和3采用了这种方法。但是我个人更喜欢插件方法。这样更容易，而且省力。

^¹ ^{我有很好的权威证明 mrJar 插件正在通过JDK14 +支持进行升级。预计将在接下来的1-2天内宣布发布v0.0.17版。}

了解JPMS模块的错误

1 个答案: