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Blank lines are added after every valid line of code when checking out .java files that has been checked into cvs by other developers, using other ide's/platforms. This doubles the length of the file and if the the extra carridge returns are removed the cvs diff highlights every line of code(making it useless). Problem existed on version 3.3.2 as well.
Well, does this problem exist on command-line? Can you describe steps how to reproduce it? I think, that you mix the operating systems. You have to assure, that you commit files from the same operting system on which you did the checkout. If you use different OSs for checkout and commit, you will malform your sources. This is what probably has happened here. Due to above reasons I'm resolving this as "worksforme", reopen if you disagree.
We don't say you did the conversion personally. It might be some of your colleagues. If you are pretty sure none of you checked out the sources on different OS than commit happened, reopen with further description. Can you reproduce it from scratch ? Like: new file, "CVS|Add", "CVS|Commit", delete it, "CVS|Check Out", modify, "CVS|Commit", delete and "CVS|Check Out" again leads to this ? Meanwhile verifying as invalid bug.