unreachable variable for groovy script

Q&A
1

Hi…
I am doing a similar script to configure DB. Above is my script.

public class ConfigurationDB { public static final instance = new ConfigurationDB (); 
def String url
def String server
def String port
def String database
def String user
def String password
 
static getInstance() {
return instance;
}
 
public ConfigurationDB () {
 
this.server = "localhost";
this.port = "5432";
this.database = "db";
this.user = "user";
this.password = "pass";
this.url = "jdbc:postgresql://"+this.server+":"+this.port+"/"+this.database;
}
}

when I do the test separately for each value, I obtain the correct result for each one, but when I tried to test the total connector I have the next error:

Tipo de Expresion no admitido para la prueba: Parametro de entrada script esta usando una expresion que contiene una referencia inalcanzable. 
Type of expression unadmitted for the test:
Imput Parameter 'script' is using a expression that contain a unreachable variable.

thank you…
regards…