Problem regarding JpcapDumper

hello

i downloaded a JpcapDumper.in it different classes were extended from the abstarct class ‘JDPacketAnalyzer’.but when we compile the source codes of classess extended from this class it gives errors
e.g if we compile the PacketAnalyzer class which extends from JDPacketAnalyzer erroe generated is

symbol:class JDPacketAnalyzer
public class PacketAnalyzer extends JDPacketAnalyzer

futher i should mention that we are using the JDK 1.6.0_3.0