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

问题描述

我试图从命令行向java类传递一个参数。我跟着这个帖子： HTTP：//gradle.1045684。 n5.nabble.com/Gradle-application-plugin-question-td5539555.html ，但代码不适用于我（可能它不适用于JavaExec？）。下面是我试过的：

pre $ task listTests（type：JavaExec）{
main =util.TestGroupScanner
classpath = sourceSets.util.runtimeClasspath
//这个可以工作...
args'demo'
/ *
//这不起作用！
if（project.hasProperty（group））{
args group
}
* /
}


上述硬编码参数值的输出为：

  C：\ws\svn\sqe\sandbox\selenium2forbg\testgradle>克listTests 
：compileUtilJava UP-TO-DATE 
：processUtilResources UP-TO-DATE 
：utilClasses UP-TO-DATE 
：listTests 
收到的参数：demo 
 
建立成功
 
总时间：13.422秒
  

但是，一旦我将代码更改为使用hasProperty部分并将demo作为参数传递给命令行，得到一个NullPointerException：

  C：\ws\svn\sqe\sandbox\selenium2forbg\testgradle>克listTests -Pgroup = demo -s 
 
失败：构建失败，出现异常。 
 
 *其中：
构建文件'C：\ws\svn\sqe\sandbox\selenium2forbg\testgradle\build.gradle'行：25 
 
 *出错：
评估根项目'testgradle'时发生问题。 
> java.lang.NullPointerException（无错误消息）
 
 *尝试：
使用--info或--debug选项运行以获取更多日志输出。 
 
 *例外情况是：
 org.gradle.api.GradleScriptException：评估根项目
'testgradle'时发生问题。 
在org.gradle.groovy.scripts.internal.DefaultScriptRunnerFactory $ ScriptRunnerImpl.run（DefaultScriptRunnerFactory.java:54）
在org.gradle.configuration.DefaultScriptPluginFactory $ ScriptPluginImpl.apply（DefaultScriptPluginFactory.java:127） 
 at org.gradle.configuration.BuildScriptProcessor.evaluate（BuildScriptProcessor.java:38）
  

有一个简单的测试项目可在 http：//gradle.1045684.n5 .nabble.com / file / n5709919 / testgradle.zip ，说明问题所在。

这是使用Gradle 1.0-rc-3。 NullPointer来自以下代码行：

  args组
  

我在任务定义之前添加了以下赋值，但它并未改变结果：

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

关于如何将命令行参数传递给gradle的指针表示赞赏。 >

解决方案

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

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
    }
    */
}

The output from the above hard coded args value is:

C:\ws\svn\sqe\sandbox\selenium2forbg\testgradle>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

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:\ws\svn\sqe\sandbox\selenium2forbg\testgradle>g listTests -Pgroup=demo -s

FAILURE: Build failed with an exception.

* Where:
Build file 'C:\ws\svn\sqe\sandbox\selenium2forbg\testgradle\build.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) 

There is a simple test project available at http://gradle.1045684.n5.nabble.com/file/n5709919/testgradle.zip that illustrates the problem.

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

args group 

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

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

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

解决方案

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).

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