Preloading Java classes

Question

Hi everybody,
I am trying to preload some Xerces XML Parser class files in order to speed up the (first) parsing procedure of a document. Therefore, I tried the following:
String cwd = System.getProperty("user.dir");
          String[] jars = new String[] { "xercesImpl.jar", "xml-apis.jar",
                    "xalan.jar" };
          for (int i = 0; i < jars.length; i++) {
               try {
                    ZipFile z = new ZipFile(cwd + "\\" + jars);
                    Enumeration e = z.entries();
                    while (e.hasMoreElements()) {
                         try {
                              String token = e.nextElement().toString();
                              Class.forName(token);                              
                         } catch (ClassNotFoundException e2) {
               } catch (IOException e) {
                    e.printStackTrace();
Unfortunately, I found that the classes were not preloaded as I hoped and had read in the web. I am wondering whether it might have something to do with using the wrong class loader - which would explain why the class loader actually used during parsing needs to load the classes again...
Any suggestions? Ideas highly appreciated!!!
Thanks in advance.
Xypher

Answer 1

But on the other hand: why don't you just forget
about what's good and what's not , leave this to me
and help me solve my little problem?On the other hand, why don't you keep in mind that this is a public unmoderated forum, and people will post whatever they see fit. The fact that everyone so far is posting sincere answers that they feel are designed to benefit you should be considered a boon. Not all questions receive (or merit) such treatment. If you get an answer that you think doesn't suit you, you would probably benefit more by asking questions about it in case there's something you didn't think of, or explaining why you think it isn't applicable, or at worst just ignoring it. Trying to direct people how to answer your question is not helpful to anyone, least of all you.
Yes, but from a user's perspective, a system startup
seems deterministic whereas a file open with
different execution times is not.If you have gotten complaints from users that sometimes it takes too long (seems unlikely since .8 seconds isn't much more than an eyeblink), then I would go with dubwai's suggestion. Otherwise, research to your heart's content because it's always good to learn more about the language. However, introducing a fix to a problem that doesn't really exist does nothing other than introduce the possibility of new bugs and more difficult maintenance, and waste time.