Properties getProperty returning null

Question

I'm having the following problem. I'm using Java properties to read some info of a file, but when I call prop.getProperty("var") it returns null. I ran out of ideas. Here is the code I have.

static final Properties prop = new Properties();
public JConnection(){
    try{
        prop.load(new FileInputStream("db.properties"));
    }catch(Exception e){
        logger.info("file not found.");
        e.printStackTrace();
    }
}

I never get the error message "file not found".

 public static Connection getConnection(String conType) {
    Connection conn;
    try {
        Class.forName("oracle.jdbc.driver.OracleDriver"); 
        if(model == "client"){
             conn = DriverManager.getConnection(prop.getProperty("url"),prop.getProperty("usr"),prop.getProperty("pass"));  
        }else{
            conn = DriverManager.getConnection(prop.getProperty("url1"),prop.getProperty("usr1"),prop.getProperty("pass1")); 
        }
    } catch (Exception ex) {            
        ex.printStackTrace();
        conn = null;
    }

When it tries to connect to the DB, getProperty is returning null as it is not found. Any ideas of what it could be or what I'm doing wrong?

Answer 1

Another wild guess: I noticed that both your prop variable and the method that's reading from it are static, so maybe you are using this as some sort of static utilities class without ever creating an instance of the class? In this case, you are never calling the constructor and never actually loading the properties file. Instead, you might try this:

static final Properties prop = new Properties();
static {
    try{
        prop.load(new FileInputStream("db.properties"));
    }catch(Exception e){
        logger.info("file not found.");
        e.printStackTrace();
    }
}

Answer 2

You have a static field (prop), but you initialize it in a constructor. This means if you consult your prop object before you construct any object of JConnection, prop will not be initialized.

You can try something like this:

public class JConecction {
    static final Properties prop = new Properties();

    static {
        try {
            prop.load(new FileInputStream("db.properties"));
        } catch(Exception e) {
            logger.info("file not found.");
            e.printStackTrace();
        }
    }
}