Include extra files in jar

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I read from xml and gram files in my Java node

URL url = MyClass.class.getResource("config.xml");
    configurationManager = new ConfigurationManager(url);

However, this xml file is not included in the jar file created by the gradle. That's why my app will keep returning NullPointerException.

I tried adding files as dependency to build.gradle file, without succes

runtime fileTree(dir: 'src/path/to/my/class', include: ['.gram']) runtime fileTree(dir: 'src/path/to/my/class', include: ['.xml'])

I read at SO , that i should add from "rule" to the jar task, but I can't find it.

So, how can I add files to the jar?