Cannot save a url as a value in a PropertiesConfiguration object
PropertiesConfiguration pc = new PropertiesConfiguration();
pc.setProperty("url", "jdbc:postgres://localhost:5432/somedb");
pc.setBasePath(".");
pc.setFileName("my.properties");

url = jdbc:postgres://localhost:5432/somedb.

public class PropertiesTest {
  public static void main(String[] args) throws Exception {
    Properties props = new Properties();
    props.put("url", "jdbc:postgres://localhost:5432/somedb");
    OutputStream out = new FileOutputStream("my.properties");
    props.store(out, null);
  }
}

url=jdbc:postgres://localhost:5432/somedb

public static void main(String[] args) throws Exception {
    File props = new File("my_raw.properties");
    BufferedWriter writer = new BufferedWriter(new FileWriter(props));
    writer.write("url=jdbc:postgres://localhost:5432/somedb");
    writer.close();
  }