A block of code takes more time in JRE 6_20 but less in the previous versio

Question

while (entries.hasMoreElements()) {
ZipEntry zipEntry = (ZipEntry) entries.nextElement();
is = zipFile.getInputStream(zipEntry);
File file = new File(unzipDir, zipEntry.getName());
if (is.available() == 0) {
file.mkdir();
is.close();
} else {
file.createNewFile();
fos = new FileOutputStream(file);
CommonUtils.connectIO(is, fos, -1, true);
}

Answer 1

Sorry a type,. The above code takes more time when I run withJDK 6_20. But its less time if the previous version is used. Cannot figure whats wrong. Here is the full method.
* Unzips the specified file into the specified directory. The optional file names list allows the caller
* to specify the actual files that get unzipped.
* @param srcFile the file to unzip
* @param unzipDir the directory where the unzipped files will be put
* @param fileNames the optional list of name strings for the zip entries to unzip or <code>null</code> to unzip
* all entries
* @throws NullPointerException if either the source file or the unzip directory is <code>null</code>
* @throws javax.faces.FacesException if the
public static void unzipFile(File srcFile, File unzipDir, List fileNames) {
if (srcFile == null) {
throw new NullPointerException("The zip file argument is null");
if (unzipDir == null) {
throw new NullPointerException("The unzip directory argument is null");
ZipFile zipFile = null;
InputStream is = null;
FileOutputStream fos = null;
try {
zipFile = new ZipFile(srcFile);
Enumeration entries = null;
if (fileNames != null) {
// Use a vector only so we can abstract away the zip entries enumeration...
Vector v = new Vector();
Iterator it = fileNames.iterator();
while (it.hasNext()) {
String name = (String) it.next();
v.add(new ZipEntry(name));
entries = v.elements();
} else {
entries = zipFile.entries();
while (entries.hasMoreElements()) {
ZipEntry zipEntry = (ZipEntry) entries.nextElement();
is = zipFile.getInputStream(zipEntry);
File file = new File(unzipDir, zipEntry.getName());
if (is.available() == 0) {
file.mkdir();
is.close();
} else {
file.createNewFile();
fos = new FileOutputStream(file);
CommonUtils.connectIO(is, fos, -1, true);
catch (IOException e) {
throw new FacesException("Problem unzipping file " + srcFile.getAbsolutePath(), e);
finally {
try {
if (is != null) {
is.close();
if (fos != null) {
fos.close();
if (zipFile != null) {
zipFile.close();
catch (IOException e) {
throw new FacesException("Problem closing resources when unzipping file " + srcFile.getAbsolutePath(), e);
}