having a lil issue, i have create a properties file :
config.properties located in ../resource/config.properties
this is the file currently :
des
You seem to misunderstand what properties files are. They're just data. They don't contain Java code, and aren't used to declare variables. To get the value associated to the key destinationPDF in the properties file, you need to call
String destinationPDF = prop.getProperty("destinationPDF");
after having initialized the prop variable and loaded the file using prop.load(new FileInputStream(...)). And then you'll have a variable initialized with the value of the key.
Side note: please respect the Java naming conventions: variables start with a lower-case letter.