I'm having an issue where org.apache.commons.io.FileUtils.copyFile(File, File) is producing slightly different files. When I compare these files with bsdiff or in an editor, I can tell they're different. Certain bytes are being copied as question marks. For example 0200 (octal) is being copied as ? (077 octal).
So, I create a test case to include in a bug report. I make a copy of the executable, and then compare using FileUtils.checksumCRC32(File). Unexpectedly, the files have the same checksum. I then compare them by iterating through a FileInputStream of each file. This also asserts that the files are the same.
The files certainly differ. One runs, the other doesn't. bsdiff produces a diff of the two files. I can tell that certain bytes are being copied wrong by inspecting the files with my eyes.
However, to the JVM these files are the same. Any ideas of why I'm observing this behavior?
System info: Windows 7, 64 bit; JVM 1.6.0_22, 32 bit
Eh, sorry everyone. Maven was 'filtering' the executable, which changed the encoding before copying it to maven's 'target' directory. Then FileUtils was correctly copying the messed up executable from 'target' to the destination. I was comparing the version in my source directory to the one in the destination.