Why can't my system find my properties file?

Question

I have a properties file called admin.properties under src/config and whenever I run the program it gives me this error:

java.io.FileNotFoundException: admin.properties (The system cannot find the file specified)

Here is my code:

package com.in.props;

public class Props {
    public static void main(String[] args) {
        String filePath = "config/admin.properties";
        Properties adminProps = new Properties();
        adminProps.load(new FileInputStream(filePath));
        String userName = adminProps.getProperty("userName").trim();
        String password = adminProps.getProperty("password").trim();
    }
}

Here's the properties file, admin.properties:

userName=test
password=test

My Props class (in com.in.props) and the admin.properties (in config) are under different directories.

Project_Root
-src
 -config
   -admin.properties
 -com
   -in
     -props
       -Props.java

I am not using eclipse and I want to execute this via command prompt.

Solution

It's much easier to load files using the ClassLoader. Use getClass().getResourceAsStream() to get files that are on your classpath:

InputStream is = Props.class.getResourceAsStream("/src/config/admin.properties");
if(is != null) {
    Properties adminProps = new Properties();
    adminProps.load(is);

Note that the leading slash is very important.