How to declare / change Java variables via gradle script

Question

Is it possible to declare or change Java variables accessible via code with gradle?

I found Is it possible to declare a variable in Gradle usable in Java? and it tells me how to declare variables accessible via Java code for Android projects.

Is it possible to do the same with "normal" Java projects? I want to set a variable depending on which task is executed.

Thanks for your help!

A common solution is to generate/detokenize a resource file (e.g. properties file) and read that from the Java code. — Peter Niederwieser
– Peter Niederwieser, Commented Sep 1, 2014 at 21:27
@PeterNiederwieser I already thought about that but I don't find a solution for this :( Do you have a reference to a code snippet or a snippet itself? Thanks a lot anyway! — Chris
– Chris, Commented Sep 1, 2014 at 21:34
chimera.labs.oreilly.com/books/1234000001741/… Instead of declaring a new Copy task, you'd configure the Java plugin's processResources task. — Peter Niederwieser
– Peter Niederwieser, Commented Sep 1, 2014 at 21:41

Chris · Accepted Answer · 2014-09-07 17:40:13Z

5

Thanks to @PeterNiederwieser I solved my problem:

In my gradle.build I use:

task usernameMaxio(type: Copy) {
  from 'src/main/resources/properties'
  into 'build/resources/main/properties'
  expand([
    username: 'Maxio'
  ])
}

and I access it via:

Properties properties = new Properties();
ClassLoader loader = Thread.currentThread().getContextClassLoader();
InputStream stream = loader.getResourceAsStream("properties/app.properties");
try {
    properties.load(stream);
} catch (IOException | NullPointerException e) {
    WebOptionPane.showMessageDialog(null, "Couldn't read app.properties", "Fehler",
                                    WebOptionPane.ERROR_MESSAGE);
    e.printStackTrace();
    return;
}
name = properties.getProperty("username");

And in my app.properties:

username=${username}

answered Sep 7, 2014 at 17:40

Chris

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