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copied!<p>I would guess that you need to set the checksum to the md5 hash of the file's <em><strong>contents</strong></em>, not the hash of the <em>path-name</em>. </p> <p>Why would they (google) care about the path? It makes no sense at all. Forgive me if I misinterpreted your code, but I think you have misconceived the concept of file checksums. </p> <p>Anyway, what you need to do is eat (digest) the file and not the path:</p> <pre><code> import java.security.*; import java.util.*; import java.math.*; import java.io.*; public class MD5 { private MessageDigest mDigest; private File openFile; private FileInputStream ofis; private int fSize; private byte[] fBytes; public MD5(String filePath) { try { mDigest = MessageDigest.getInstance("MD5"); } catch (NoSuchAlgorithmException e) { System.exit(1); } openFile = new File(filePath); } public String toString() { try { ofis = new FileInputStream(openFile); fSize = ofis.available(); fBytes = new byte[fSize]; ofis.read(fBytes); } catch (Throwable t) { return "Can't read file or something"; } mDigest.update(fBytes); return new BigInteger(1, mDigest.digest()).toString(16); } public static void main(String[] argv){ MD5 md5 = new MD5("someFile.ext"); System.out.println(md5); } } </code></pre> <p>So the error in your snippet above is here: </p> <pre><code> messageDigest.update(String.valueOf(file.hashCode()).getBytes()); </code></pre> <p>Now, I can show that my class gives the correct md5sum of the <em>file</em> which is most likely what you need. Just read the javadoc of the method if you don't trust me: <a href="http://gdata-java-client.googlecode.com/svn/trunk/java/src/com/google/gdata/data/docs/DocumentListEntry.java" rel="nofollow">http://gdata-java-client.googlecode.com/svn/trunk/java/src/com/google/gdata/data/docs/DocumentListEntry.java</a> What it says is: * Set the MD5 checksum calculated for the document. ... nothing about the path's checksum :) </p> <p>here: </p> <pre><code>$ echo "Two dogs are sleeping on my couch" > someFile.ext $ echo "Two dogs are sleeping on my couch" |md5sum 1d81559b611e0079bf6c16a2c09bd994 - $ md5sum someFile.ext 1d81559b611e0079bf6c16a2c09bd994 someFile.ext $ javac MD5.java && java MD5 1d81559b611e0079bf6c16a2c09bd994 </code></pre>

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