How to Pass Parameters with gradlew Command Line in Gradle Project

Learn how to successfully pass parameters from the `gradlew` command line to your Gradle tasks without hassle. Follow our step-by-step guide for an effective solution!
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Can’t Pass Parameters/System Properties with gradlew Command Line? Here's the Solution!

If you've been working with Gradle, you might have faced difficulties passing parameters through the gradlew command line. This is a common challenge many developers encounter when trying to use system properties in their tests. Fortunately, this guide is here to help you solve that problem effectively!

The Problem Explained

You might be able to pass optional parameters using an XML file, but what if you want to pass them directly via the command line? Let’s break down what’s going wrong in your setup.

Sample Test Setup

Here’s a simplified version of how your Gradle task and XML might look:

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In the XML file, you likely have something like this:

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In your Java code, you're trying to access the value of the parameter ipAmount with the following code:

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The Challenge

When you run your command like this:

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you find that while ipAmount prints as 20 from the XML, IP_AMOUNT_PARAMETER returns null. This clearly shows that the parameter isn't being picked up as you intended.

The Solution: Correctly Passing Parameters

To resolve this issue, there is a simple adjustment you can make in your Gradle task definition. By using the systemProperties method, you can effectively pass your command line parameters to the system properties of the test execution.

Update Your Gradle Task

Here’s how to adjust your task to make it work:

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How It Works

systemProperties: This method allows you to add system properties into your test environment. It essentially creates a map of the specified properties, including ipAmount or any other parameters you choose to add.

Command Line Invocation: You can still invoke the task as before:

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Adding More Parameters

If you want to add more parameters in the future, simply extend the map with additional variables. For example:

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Conclusion

By following these steps, you should be able to successfully pass parameters from the gradlew command line to your Gradle tasks. This method enhances flexibility in configuring tests and alleviates the hassle of dealing with fixed XML parameters. Now you can run your tests with custom parameters on-the-fly! Don’t hesitate to try it out and enjoy a smoother testing experience.

Happy coding!

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