如何将参数从命令行传递到 gradle [英] How to pass arguments from command line to gradle

问题描述

我正在尝试将参数从命令行传递到 Java 类.我关注了这篇文章:http://gradle.1045684.n5.nabble.com/Gradle-application-plugin-question-td5539555.html 但代码对我不起作用(也许它不适用于 JavaExec?).这是我尝试过的:

I'm trying to pass an argument from command line to a java class. I followed this post: http://gradle.1045684.n5.nabble.com/Gradle-application-plugin-question-td5539555.html but the code does not work for me (perhaps it is not meant for JavaExec?). Here is what I tried:

task listTests(type:JavaExec){
    main = "util.TestGroupScanner"
    classpath = sourceSets.util.runtimeClasspath
    // this works...
    args 'demo'
    /*
    // this does not work!
    if (project.hasProperty("group")){
        args group
    }
    */
}

上述硬编码 args 值的输出为:

The output from the above hard coded args value is:

C:wssvnsqesandboxselenium2forbg	estgradle>g listTests
:compileUtilJava UP-TO-DATE
:processUtilResources UP-TO-DATE
:utilClasses UP-TO-DATE
:listTests
Received argument: demo

BUILD SUCCESSFUL

Total time: 13.422 secs

但是，一旦我更改代码以使用 hasProperty 部分并在命令行上将demo"作为参数传递，我就会收到 NullPointerException:

However, once I change the code to use the hasProperty section and pass "demo" as an argument on the command line, I get a NullPointerException:

C:wssvnsqesandboxselenium2forbg	estgradle>g listTests -Pgroup=demo -s

FAILURE: Build failed with an exception.

* Where:
Build file 'C:wssvnsqesandboxselenium2forbg	estgradleuild.gradle' line:25

* What went wrong:
A problem occurred evaluating root project 'testgradle'.
> java.lang.NullPointerException (no error message)

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

* Exception is:
org.gradle.api.GradleScriptException: A problem occurred evaluating root project
 'testgradle'.
    at org.gradle.groovy.scripts.internal.DefaultScriptRunnerFactory$ScriptRunnerImpl.run(DefaultScriptRunnerFactory.java:54)
    at org.gradle.configuration.DefaultScriptPluginFactory$ScriptPluginImpl.apply(DefaultScriptPluginFactory.java:127)
    at org.gradle.configuration.BuildScriptProcessor.evaluate(BuildScriptProcessor.java:38) 

http://gradle 上有一个简单的测试项目.1045684.n5.nabble.com/file/n5709919/testgradle.zip 说明了问题.

这是使用 Gradle 1.0-rc-3.NullPointer 来自这行代码:

This is using Gradle 1.0-rc-3. The NullPointer is from this line of code:

args group 

我在任务定义之前添加了以下分配，但它没有改变结果:

I added the following assignment before the task definition, but it didn't change the outcome:

group = hasProperty('group') ? group : 'nosuchgroup' 

有关如何将命令行参数传递给 gradle 的任何指示表示赞赏.

Any pointers on how to pass command line arguments to gradle appreciated.

推荐答案

project.group 是一个预定义的属性.使用-P，您只能设置未预定义的项目属性.或者，您可以设置 Java 系统属性 (-D).

project.group is a predefined property. With -P, you can only set project properties that are not predefined. Alternatively, you can set Java system properties (-D).

这篇关于如何将参数从命令行传递到 gradle的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！