如何使用Gradle制作多版本的JAR文件? [英] How to make Multi-Release JAR Files with Gradle?

问题描述

Java9引入了多版本JAR .

假设我有一个使用java8的多模块Gradle项目:

Let's say that I have multimodule Gradle project using java8:

project-root
      settings.gradle
      build.gradle 
      /module1
          /src
          ... (common maven structure)
      /module2
      /module3

这是Gradle中常见的多模块项目.假设module1我需要MR-Jar.

This is a common multi-module project in Gradle. Let's say I need MR-Jar for module1.

我无法添加针对Java9的module1-java9，因为它的基数是8-到目前为止，我的Gradle和IntelliJ IDEA都在抱怨. Gradle是使用java8编译的，但是我只需要为模块启用java9运行时(不知道如何)；在IntelliJ IDEA中，我可以为模块设置java9运行时，但是每次重装gradle配置时，它都会被覆盖.

I can't add module1-java9 targeting Java9 because the base is on 8 - so far, both my Gradle and IntelliJ IDEA complains. Gradle is compiled with the java8, but I need to enable java9 runtime just for the module (don't know how); in IntelliJ IDEA I can set the java9 runtime for the module, but it gets overwritten every time when gradle config is reloaded.

此外，即使我以某种方式添加它，我也需要指示module1到1)建立第二个，以及2)包含module1-java9.这是这种情况的图形:

Moreover, even if I add it somehow, I need to instruct module1 to 1) build second and 2) to include module1-java9. Here is a drawing of this situation:

project-root
      settings.gradle
      build.gradle 
      /module1
      /module1-java9  (added java9 module)
      /module2
      ...

或者，这可以在module1下完成，其来源不同:src和src-java9.但我怀疑这会不会被接受.这是一张图纸:

Alternatively, this could be done under module1, having different sources: src and src-java9. but I doubt this would ever be accepted. Here is a drawing:

project-root
      settings.gradle
      build.gradle 
      /module1
          /src
          /src-java9 (added java9 source folder)
      /module2
      /module3

到目前为止，我只看到module1-java9是一个单独的项目(不是模块)，并且module1只是在此处调用gradle并获取输​​出.是的，这是gradle调用gradle:)))

So far I only see that module1-java9 is a separate project (not a module) and that module1 simply calls the gradle there and takes the output. Yeah, it's gradle calling gradle :)))

是否有任何开发人员友好的方式来做到这一点?

Is there any developer-friendly way to do this?

推荐答案

如问题评论中所述，此博客文章和相关的示例项目描述了如何创建多版本带有Gradle的JAR.

As mentioned in the comments on the question, this blog post and the associated example project describe how to create a multi-release JAR with Gradle.

万一博客文章或示例项目不见了，您还可以参考以下从示例项目衍生而来的设置，并根据问题中给出的设置进行一些调整(只要提供了详细信息) ).

In case the blog post or example project should go away, you may also refer to the following setup which was derived from the example project and tailored a bit to the setup that is given in the question (as far as details are provided).

project-root/
├── build.gradle
├── module1
│   └── src
│       └── main
│           ├── java
│           │   └── com
│           │       └── acme
│           │           ├── JdkSpecific.java
│           │           └── Shared.java
│           └── java9
│               └── com
│                   └── acme
│                       └── JdkSpecific.java
├── module2
│   └── whatever
├── module3
│   └── whatever
└── settings.gradle

build.gradle

allprojects {
    apply plugin: 'java'

    compileJava {
        sourceCompatibility = 8
        targetCompatibility = 8
    }
}

dependencies {
    implementation project(':module1')
}

project(':module1') {
    sourceSets {
        java9 {
            java {
                srcDirs = ['src/main/java9']
            }
        }
    }

    compileJava9Java {
        sourceCompatibility = 9
        targetCompatibility = 9
    }

    dependencies {
        java9Implementation files(sourceSets.main.output.classesDirs) {
                builtBy compileJava
            }
    }

    jar {
        into('META-INF/versions/9') {
            from sourceSets.java9.output
        }
        manifest.attributes('Multi-Release': 'true')
    }
}

settings.gradle

include 'module1', 'module2', 'module3'

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