没有提供任何版本的情况下，一些gradle依赖关系如何工作 [英] How are some gradle dependencies working with no version supplied

问题描述

据我所知，在设置依赖关系时，gradle需要一个版本号，但允许部分通配符。例如，如果我想要番石榴，我不能这样做，因为它失败了：

  compile（'com.google.guava：guava' ）
  

它必须是（作为例子）：

  compile（'com.google.guava：guava：21.0'）
  

然而，我正在学习Spring，它包含以下内容：

  compile（org.springframework .boot：spring-boot-starter）
 compile（org.springframework：spring-web）
 compile（com.fasterxml.jackson.core：jackson-databind）
  

这些依赖关系是如何在没有提供任何版本的情况下工作的？

这是因为以下原因，但我认为这些行仅仅是我的插件'org.springframework.boot'所必需的：

  buildscript {
 repositories {
 mavenCentral（）
} 
依赖项{
 classpath（org.springframework.boot：spring-boot-gradle-plugin：1.4.3 .RELEASE）
} 
} 
  spring-boot-dependencies项目中检查一>。这在以下文档中提到： http://docs.spring.io/spring-boot/docs/current/reference/html/using-boot-build-systems.html  
 
 
 < Spring提供的另一种方式（对于非引导项目）通过 Spring Platform BOM 执行实际上提供了以下依赖项的版本。
 
 
  buildscript {
 repositories {
 jcenter（）
} 
依赖关系{
 classpath'io.spring.gradle：dependency-management-plugin：0.6.0.RELEASE'
} 
} 
 
 apply plugin：'io.spring .dependency-management'
 
 dependencyManagement {
 impor ts {
 mavenBom'io.spring.platform：platform-b​​om：Athens-SR2'
} 
} 
  
 
As far as I know gradle requires a version number when setting dependencies, but partial wildcards are allowed. For example if I want Guava, I cannot do this as it fails:
compile('com.google.guava:guava')
It has to be (as an example):
compile('com.google.guava:guava:21.0')
However, I'm learning Spring, which has the following:
compile("org.springframework.boot:spring-boot-starter")
compile("org.springframework:spring-web")
compile("com.fasterxml.jackson.core:jackson-databind")
How are these dependencies working with no version supplied?

Is it because of the following, but I thought these lines were required only for my plugin 'org.springframework.boot':
buildscript {
 repositories {
    mavenCentral()
 }
 dependencies {
    classpath("org.springframework.boot:spring-boot-gradle-plugin:1.4.3.RELEASE")
 }
}

解决方案
It worth mentioning that the trick is called BOM (bill of materials) and the actual versions can be checked in spring-boot-dependencies project. This is mentioned in the documentation under: http://docs.spring.io/spring-boot/docs/current/reference/html/using-boot-build-systems.html

Another way that Spring provides this (for non boot projects) is through Spring Platform BOM where it actually provides version for the following dependencies.
buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'io.spring.gradle:dependency-management-plugin:0.6.0.RELEASE'
    }
}

apply plugin: 'io.spring.dependency-management'

dependencyManagement {
    imports {
        mavenBom 'io.spring.platform:platform-bom:Athens-SR2'
    }
}


                        
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