UnZIPPing Exception

[Ahmed Kotb]

Hi All,

when trying to UNZIP large ZIP Files i got the Following Exception

java.util.zip.ZipException: invalid entry size (expected 4294967295 but got 4088675440 bytes)

, although my Method Working good with Small files

My Method :

//method to extract Zip Files
    public String unZip(String zipFileName, String configPath) {
        final int BUFFER = 2048;
        String reqNam = "";
        String FiNa = "";
        String FileExt = "";
        try {
            LogsModel.log(c, "System", "started in extraction operation of required ZIP file: [" + zipFileName + "].");
            BufferedOutputStream dest = null;
            FileInputStream fis = new FileInputStream(zipFileName);
            ZipInputStream zis = new ZipInputStream(new BufferedInputStream(fis));
            ZipEntry entry;
            while ((entry = zis.getNextEntry()) != null) {
                FiNa = entry.getName();
                try {
                    FileExt = FiNa.substring(FiNa.lastIndexOf("."), FiNa.length());
                    reqNam = providerName + NowDate + FileExt;
                } catch (Exception ex) {
                    ex.printStackTrace();
                    LogsModel.log(c, "System", "encountered the following Exception while trying to get file Extension From File: [" + FiNa + "],Exception is: [" + ex + "].");
                    reqNam = providerName + NowDate;
                }
                LogsModel.log(c, "System", " now extracting ZIP file: [" + zipFileName + "].");
                int count;
                byte data[] = new byte[BUFFER];
                // write the files to the disk
                FileOutputStream fos = new FileOutputStream(providerDirectory.getAbsoluteFile() + File.separator + reqNam);
                dest = new BufferedOutputStream(fos, BUFFER);
                while ((count = zis.read(data, 0, BUFFER)) != -1) {
                    dest.write(data, 0, count);
                }
                dest.flush();
                dest.close();
            }
            zis.close();
            LogsModel.log(c, "System", "finished extraction operation of required ZIP file: [" + zipFileName + "].");
        } catch (Exception e) {
            e.printStackTrace();
            LogsModel.log(c, "System", "encountered the following Exception while trying to Extract the ZIP file: [" + zipFileName + "],Exception is: [" + e + "].");
        }
        return reqNam;
    }

I tried to change the Buffer Size but Still the Same Problem.

So , Any One Can Help Me Please???

[Mohamed Sanaulla]

What is the size of the zip you are trying to unzip? There's some limit on the size of zip you can handle using pre Java 7 Zip APIs, so may be that is the reason you are seeing the exception. I think the data size limit is 4GB. To handle data more than 4GB you need to be using the API which supports Zip64 format and the Java 7 supports it or you can use Apache Commons Compress 1.3 version for zip/unzip

[Ahmed Kotb]

Size of Zip File is 1.2 GB and after UnZipping 7.8 GB

[Mohamed Sanaulla]

Ahmed Kotb wrote:Size of Zip File is 1.2 GB and after UnZipping 7.8 GB

I think this is the reason- the unzipped is more than 4GB. Which JDK version are you using?

Try using Apache Commons Compress- The process is exactly similar just that the class names are different- You have ZipArchiveEntry, ZipArchiveInputStream and so on.

[Ahmed Kotb]

Mohamed Sanaulla wrote:
Which JDK version are you using?

I am Using Version "1.6.0_21" of JAVA

Mohamed Sanaulla wrote:
Try using Apache Commons Compress

I am not the Person Who Compress the File , So I have no control on Compressing the File , I just Take the File as it and then deal with it So is there any way in Apache Commons i Can use to Uncompress the File??

[Mohamed Sanaulla]

Yeah you can use Apache Commons Compress API to unzip. So you can give it a try, you just have to download the jar and add it to the classpath.

[Ahmed Kotb]

Mohamed Sanaulla wrote:
Yeah you can use Apache Commons Compress API to unzip

So Please can you tell me The Jar Name and the Link I can download from it.

[Ahmed Kotb]

Thanks Mohamed Sanaulla I tried Apache Commons Library and it works Fine.

[Mohamed Sanaulla]

Glad that you got it working.