如何将参数从命令行传递到gradle

Question

我试图将一个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，但是代码对我来说不起作用（也许它不适合JavaExec？）。以下是我所尝试的：

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
    }
    */
}

上面硬编码的args值的输出是：

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

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) 

args group 

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

任何关于如何将命令行参数传递给gradle的指针都很感激。

Answer 1

project.group是预定义的属性。使用-p，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)。