How to insrert code directly before/after expression.

[solarwind__]

Hey all, I have a quick question regarding Javassist.

How do I insert an expression directly before/after an expression?

For example, I have a HelloWorld class with a log method that prints out the numbers to screen like this:

1
2
3
5
6

Notice number 4 is missing. I want to be able to insert a log("4"); statement between log("3"); and log("5");

How do I do this?

HelloWorld.java:

public class HelloWorld {
 public static void main(String[] args) {
 log("1");
 log("2");
 log("3");
 log("5");
 log("6");
 }

 private static void log(Object o) {
 System.out.println(o);
 }
}

[solarwind__]

P.S: I don't want to refer to line numbers since I will be obfuscating and deleting the line number tables.