My code was written in java SE 5. After setting source level and library source level to Java SE 6
and making the necessary changes, I discovered that references to the Map interface both in my
code and in the Java API for Java SE 6 were flagged by my IDE with the following error
(Cannot find symbol, symbol=map, location=package java.util).
Also there was no source for the Map interface in the Java API for Java SE 6.