java.io.IOException: Corrupt GZIP trailer

[Romeo Ranjan]

Dear Ranchers,

My code tries to unzip a folder read the file in it and display the contents of the file. But while doing it I get this error. I did google for this error and saw a post in this forums but nothing is directing me towards a solution.
Here is the code snippet and the error

String FilePath="path to my file";
File file = new File(FilePath);
            String fileName = file.getName();
            String suffix = fileName.substring(0, fileName.indexOf("."));
            GZIPInputStream stream = new GZIPInputStream(new FileInputStream(FilePath)); 
            BufferedReader gReader = new BufferedReader(new InputStreamReader(stream));
while((line = gReader.readLine()) !=null){
   System.out.println(line);
}

java.io.IOException: Corrupt GZIP trailer
        at java.util.zip.GZIPInputStream.readTrailer(GZIPInputStream.java:175)
        at java.util.zip.GZIPInputStream.read(GZIPInputStream.java:89)
        at sun.nio.cs.StreamDecoder$CharsetSD.readBytes(StreamDecoder.java:411)
        at sun.nio.cs.StreamDecoder$CharsetSD.implRead(StreamDecoder.java:453)
        at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:183)
        at java.io.InputStreamReader.read(InputStreamReader.java:167)
        at java.io.BufferedReader.fill(BufferedReader.java:136)
        at java.io.BufferedReader.readLine(BufferedReader.java:299)
        at java.io.BufferedReader.readLine(BufferedReader.java:362)
        at nci.cgf.annotator.process.FileCompresser.generateFiles(FileComp
resser.java:33)
        at nci.cgf.annotator.process.FileCompresser.main(FileCompresser.ja
va:109)

The file size is 2.52GB. I use jdk1.5.0_04.

Hope someone could help me with a solution.

[Jesper de Jong]

Did you try unzipping the ZIP file with a regular unzip program? Does it work without errors or not? If it also gives an error, then maybe the ZIP file is really corrupt.

[Romeo Ranjan]

I unzipped the folder to see the file and its contents, it works just fine. Its not corrupt. The problem is I am expected to unzip the folder programmatically and not manually. So I need help to solve the issue.

[Rob Spoor]

Are you sure it's a GZIP file? Is it not a regular ZIP file?

[Romeo Ranjan]

Yes it I am sure its a GZIP file.