docs/source/ScriptVars.java

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import java.io.File;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;

@SuppressWarnings("javadoc")
public class ScriptVars {
    public static void main(final String[] args) throws Exception {
        final ScriptEngineManager manager = new ScriptEngineManager();
        final ScriptEngine engine = manager.getEngineByName("nashorn");

        final File f = new File("test.txt");
        // expose File object as variable to script
        engine.put("file", f);

        // evaluate a script string. The script accesses "file"
        // variable and calls method on it
        engine.eval("print(file.getAbsolutePath())");
    }
}