PLEASE HELP! how to get certificat form a JarFile (NOT JarInputStream) ?

Question

Hi,
I have a signed JAR-file.
If I try to verify this file with "jarsigner -verify", I get OK.
But if I want to get the certificat-chain from this JAR-file with
"JarFile" and then "JarEntry", I receive only "null".
For example I try it with this code:
JarEntry entry;
java.security.cert.Certificate[] dmCertChain;
for (Enumeration enumJar2 = zipFile.entries();enumJar2.hasMoreElements() ;) {
entry = zipFile.getJarEntry((enumJar2.nextElement()).toString());
dmCertChain = ((JarEntry)entry).getCertificates();
if(dmCertChain == null) {
          System.out.println("The entry has no certificate.");
else {
          System.out.println(dmCertChain.length);
          for (int i = 0; i < dmCertChain.length; i++)
          System.out.println(dmCertChain<i>.toString());
But my JAR-file is ok, because when I try it with "JarInputStream" and
then "JarFile", I receive the correct certificate-chain.
(I try it with getNextJarEntry())
How can I read the certfication-chain from the JarFile?
I searched the web for a solution, but i don't find an answer!
So please HELP!

Answer 1

I found the solution :-)
I found in Java-api-doc the following sentence:
"This method can only be called once the JarEntry has been completely verified by reading from the entry input stream until the end of the stream has been reached. Otherwise, this method will return null."
So I added this lines to my code:
// JarEntry must be completely verified by reading from the entry
// input stream until the end of the stream has been reached.
InputStream is = zipFile.getInputStream(entry);
int c;
while ((c = is.read()) != -1) {
//do nothing here, just to make sure the whole stream is read
bye