recently i downloaded the roller weblogger source from this loaction:
http://people.apache.org/~snoopdave/apache-roller-5.0/
When i tried to extract the source to some location,
it says unable to extract zip file or the zip file may be damaged.
Please help me where can i download the extractable file
All of the files in that directory were refreshed on Dec 30, after you asked the question.
So if there was a corrupted file, it has been replaced. Please try again.
Another approach is to fetch the code from Subversion as described here:
https://cwiki.apache.org/confluence/display/ROLLER/Build+Guide