Java: Try-Catch-Continue?

Let's say I can a set of statements:

try {
  String a = getProperty("a");
  String b = getProperty("b");
  String c = getProperty("c");
} catch(Exception e) {

}

Now, lets say property b was not found and the function throws an exception. In this case, how would I just continue or perhaps set b to null without having to write a try-catch block for each property? I mean, a,b,c exist but sometime they might not be found at all during which an exception is thrown.