build / install / <project> -shadow目录 - 它是什么？

时间：2017-11-13 10:04:52

标签： java gradle build.gradle uberjar shadowjar

什么是build/install/gradleHelloWorld-shadow？该目录应该或不应该是什么？

最简单的“hello world”无法构建：

thufir@dur:~/NetBeansProjects/gradleHelloWorld$ 
thufir@dur:~/NetBeansProjects/gradleHelloWorld$ gradle clean runShadow

> Task :shadowJar 
A problem was found with the configuration of task ':shadowJar'. Registering invalid inputs and outputs via TaskInputs and TaskOutputs methods has been deprecated and is scheduled to be removed in Gradle 5.0.
 - No value has been specified for property 'mainClassName'.
The SimpleWorkResult type has been deprecated and is scheduled to be removed in Gradle 5.0. Please use WorkResults.didWork() instead.

> Task :startShadowScripts 
Using TaskInputs.file() with something that doesn't resolve to a File object has been deprecated and is scheduled to be removed in Gradle 5.0. Use TaskInputs.files() instead.


FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':installShadowDist'.
> The specified installation directory '/home/thufir/NetBeansProjects/gradleHelloWorld/build/install/gradleHelloWorld-shadow' is neither empty nor does it contain an installation for 'gradleHelloWorld'.
  If you really want to install to this directory, delete it and run the install task again.
  Alternatively, choose a different installation directory.

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

* Get more help at https://help.gradle.org

BUILD FAILED in 1s
5 actionable tasks: 5 executed

Publishing build scan...
https://gradle.com/s/t7jbmhjz23giw

thufir@dur:~/NetBeansProjects/gradleHelloWorld$

构建文件：

plugins {
    id 'com.gradle.build-scan' version '1.8' 
    id 'java'
    id 'application'
    id 'com.github.johnrengelman.shadow' version '2.0.1'
}

buildScan {
    licenseAgreementUrl = 'https://gradle.com/terms-of-service'
    licenseAgree = 'yes'
    publishAlways()
}

sourceCompatibility = 1.8
targetCompatibility = 1.8

mainClassName = 'net.bounceme.dur.gradle.hello.App'

shadowJar {
    baseName = 'greeter'
    classifier = null
    version = null
}

repositories {
    jcenter()
}

configurations {
    provided
}

dependencies {
}
中止runShadow后的

项目：

thufir@dur:~/NetBeansProjects/gradleHelloWorld$ 
thufir@dur:~/NetBeansProjects/gradleHelloWorld$ tree
.
├── build
│   ├── classes
│   │   └── java
│   │       └── main
│   │           └── net
│   │               └── bounceme
│   │                   └── dur
│   │                       └── gradle
│   │                           └── hello
│   │                               └── App.class
│   ├── install
│   │   └── gradleHelloWorld-shadow
│   ├── libs
│   │   └── greeter.jar
│   ├── scriptsShadow
│   │   ├── gradleHelloWorld
│   │   └── gradleHelloWorld.bat
│   └── tmp
│       ├── compileJava
│       └── shadowJar
│           └── MANIFEST.MF
├── build.gradle
├── gradle
│   └── wrapper
│       ├── gradle-wrapper.jar
│       └── gradle-wrapper.properties
├── gradlew
├── gradlew.bat
├── settings.gradle
└── src
    ├── main
    │   └── java
    │       ├── dur
    │       └── net
    │           └── bounceme
    │               └── dur
    │                   └── gradle
    │                       └── hello
    │                           └── App.java
    └── test
        └── java

29 directories, 12 files
thufir@dur:~/NetBeansProjects/gradleHelloWorld$

有问题的/home/thufir/NetBeansProjects/gradleHelloWorld/build/install/gradleHelloWorld-shadow目录被clean删除，确定gradle正在构建此目录。

刚刚升级了gradle：

thufir@dur:~$ 
thufir@dur:~$ sdk ls gradle
==== INTERNET NOT REACHABLE! ===================================================

 Some functionality is disabled or only partially available.
 If this persists, please enable the offline mode:

   $ sdk offline

================================================================================

--------------------------------------------------------------------------------
Offline: only showing installed gradle versions
--------------------------------------------------------------------------------
 > 4.3.1
 * 4.2.1
--------------------------------------------------------------------------------
* - installed                                                                   
> - currently in use                                                            
--------------------------------------------------------------------------------
thufir@dur:~$

（Wi-Fi可能有点不稳定。）

3 个答案:

答案 0 :(得分：1)

你的问题我不清楚，据我所知，错误消息很清楚是什么问题。

不确定你发布的解决方法是什么，我在评论中说要运行干净，因为大概是插件需要的，只要检查插件的源代码，如果感兴趣的原因。

反正。

  

Shadow插件还将在存在应用程序插件时配置分发任务。该插件将创建shadowDistZip和shadowDistTar，分别创建Zip和Tar分布。每个发行版都将包含带阴影的JAR文件以及启动应用程序所需的启动脚本。

此外，该插件将创建installShadowDist和startShadowScripts任务，这些任务将分发必要的文件以构建/安装/ -shadow /。

另一件事是mainClassName

  

就像普通的jar任务一样，当应用应用程序插件时，shadowJar清单将被配置为包含Main-Class属性，该属性具有项目的mainClassName属性中指定的值。

runShadow是一个javaExec任务，可能需要配置？

runShadow {
  // classpath = sourceSets.main.runtimeClasspath

  main = 'net.bounceme.dur.gradle.hello.App'

  // arguments to pass to the application
  // args 'appArg1'
}
  

当与应用程序插件一起应用时，将创建runShadow任务以从阴影JAR启动应用程序。 runShadow任务是一个JavaExec任务，配置为执行java -jar myproject-all.jar。它可以配置为与任何其他JavaExec任务相同。

ShadowJar Documentation

答案 1 :(得分：0)

变通：

thufir@dur:~/NetBeansProjects/gradleHelloWorld$ 
thufir@dur:~/NetBeansProjects/gradleHelloWorld$ gradle clean assembleShadowDist

> Task :shadowJar 
A problem was found with the configuration of task ':shadowJar'. Registering invalid inputs and outputs via TaskInputs and TaskOutputs methods has been deprecated and is scheduled to be removed in Gradle 5.0.
 - No value has been specified for property 'mainClassName'.
The SimpleWorkResult type has been deprecated and is scheduled to be removed in Gradle 5.0. Please use WorkResults.didWork() instead.

> Task :startShadowScripts 
Using TaskInputs.file() with something that doesn't resolve to a File object has been deprecated and is scheduled to be removed in Gradle 5.0. Use TaskInputs.files() instead.


BUILD SUCCESSFUL in 0s
6 actionable tasks: 6 executed
thufir@dur:~/NetBeansProjects/gradleHelloWorld$ 
thufir@dur:~/NetBeansProjects/gradleHelloWorld$ cd build/libs/
thufir@dur:~/NetBeansProjects/gradleHelloWorld/build/libs$ 
thufir@dur:~/NetBeansProjects/gradleHelloWorld/build/libs$ ll
total 20
drwxr-xr-x 2 thufir thufir 4096 Nov 13 02:53 ./
drwxr-xr-x 7 thufir thufir 4096 Nov 13 02:53 ../
-rw-r--r-- 1 thufir thufir 1492 Nov 13 02:53 greeter.jar
thufir@dur:~/NetBeansProjects/gradleHelloWorld/build/libs$ 
thufir@dur:~/NetBeansProjects/gradleHelloWorld/build/libs$ jar xf greeter.jar 
thufir@dur:~/NetBeansProjects/gradleHelloWorld/build/libs$ 
thufir@dur:~/NetBeansProjects/gradleHelloWorld/build/libs$ ll
total 28
drwxr-xr-x 4 thufir thufir 4096 Nov 13 02:53 ./
drwxr-xr-x 7 thufir thufir 4096 Nov 13 02:53 ../
-rw-r--r-- 1 thufir thufir 1492 Nov 13 02:53 greeter.jar
drwxr-xr-x 2 thufir thufir 4096 Nov 13 02:53 META-INF/
drwxr-xr-x 3 thufir thufir 4096 Nov 13 02:53 net/
thufir@dur:~/NetBeansProjects/gradleHelloWorld/build/libs$ 
thufir@dur:~/NetBeansProjects/gradleHelloWorld/build/libs$ cat META-INF/MANIFEST.MF 
Manifest-Version: 1.0
Main-Class: net.bounceme.dur.gradle.hello.App

thufir@dur:~/NetBeansProjects/gradleHelloWorld/build/libs$ 
thufir@dur:~/NetBeansProjects/gradleHelloWorld/build/libs$ java -jar greeter.jar 
Nov 13, 2017 2:53:38 AM net.bounceme.dur.gradle.hello.App run
INFO: helloooo
thufir@dur:~/NetBeansProjects/gradleHelloWorld/build/libs$
  1. 为什么这样做？
  2. 为什么没有runShadow工作？

答案 2 :(得分：0)

更好的解决方案，仍然是一种解决方法。从4.3.1切换回gradle 4.2.1：

thufir@dur:~/NetBeansProjects/gradleHelloWorld$ 
thufir@dur:~/NetBeansProjects/gradleHelloWorld$ sdk use gradle 4.3.1

Using gradle version 4.3.1 in this shell.
thufir@dur:~/NetBeansProjects/gradleHelloWorld$ 
thufir@dur:~/NetBeansProjects/gradleHelloWorld$ gradle clean runShadow

> Task :shadowJar 
A problem was found with the configuration of task ':shadowJar'. Registering invalid inputs and outputs via TaskInputs and TaskOutputs methods has been deprecated and is scheduled to be removed in Gradle 5.0.
 - No value has been specified for property 'mainClassName'.
The SimpleWorkResult type has been deprecated and is scheduled to be removed in Gradle 5.0. Please use WorkResults.didWork() instead.

> Task :startShadowScripts 
Using TaskInputs.file() with something that doesn't resolve to a File object has been deprecated and is scheduled to be removed in Gradle 5.0. Use TaskInputs.files() instead.


FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':installShadowDist'.
> The specified installation directory '/home/thufir/NetBeansProjects/gradleHelloWorld/build/install/gradleHelloWorld-shadow' is neither empty nor does it contain an installation for 'gradleHelloWorld'.
  If you really want to install to this directory, delete it and run the install task again.
  Alternatively, choose a different installation directory.

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

* Get more help at https://help.gradle.org

BUILD FAILED in 1s
5 actionable tasks: 5 executed
thufir@dur:~/NetBeansProjects/gradleHelloWorld$ 
thufir@dur:~/NetBeansProjects/gradleHelloWorld$ sdk use gradle 4.2.1

Using gradle version 4.2.1 in this shell.
thufir@dur:~/NetBeansProjects/gradleHelloWorld$ 
thufir@dur:~/NetBeansProjects/gradleHelloWorld$ gradle clean runShadow
Starting a Gradle Daemon (subsequent builds will be faster)

> Task :shadowJar
The SimpleWorkResult type has been deprecated and is scheduled to be removed in Gradle 5.0. Please use WorkResults.didWork() instead.

> Task :runShadow
Nov 13, 2017 12:02:51 PM net.bounceme.dur.gradle.hello.App run
INFO: helloooo


BUILD SUCCESSFUL in 12s
6 actionable tasks: 6 executed
thufir@dur:~/NetBeansProjects/gradleHelloWorld$

这是bug吗？

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