Troubleshooting
  • Null Pointer Exception
  • Applet CoolSlides can't start
  • Animated Image Is All Black
  • Netscape Problems
  • There are only a few problems known. We hope that this file can help you to solve yours. Otherwise, please send your e-mail to Tech@CoolSlides.com. We will answer your e-mail and help you.

    Null Pointer Exception

    The display area is just a gray box with no animation for a long time. When you move the cursor onto the gray area, you see the message on the status line (screen lower left):
        Applet CoolSlides exception:Java.lang.Null Pointer.Exception

    Why does this happen?

    The problem may occur when you are running CoolSlides both from your local drive and from a web site.  Sometimes there is a conflict between the cached files and the file locations.

    How to Fix It

    • Restart your computer to refresh the memory.
    • Start your browser without any CoolSlides file.
    • Delete your browser's cached files:
                For Internet Explorer, click View -> Internet Options -> Delete Files.
                For Netscape, click Edit -> Preferences -> Advanced -> Cache ->
                        Clear Memory Cache and Clear Disk Cache.
    • Run CoolSlides from your web site or your local drive only.

    Applet CoolSlides can't start

    The display area is just a gray box with no animation for a long time. When you move the cursor onto the gray area, you see the message on the status line (screen lower left):
        Applet CoolSlides can't start:class CoolSlides not found

    Why does this happen?

    The file CoolSlides.class has a wrong name or a wrong format.

    How to Fix It

    • Make sure that the CoolSlides.class file is in the same directory as the HTML file using it. 
    • If you used a DOS unzip that chopped the name to CoolSl~1.cla, you can change it back to CoolSlides.class. Better yet, download Winzip to unzip the files again.
    • When you upload the CoolSlides.class to your web site, make sure you uploaded it as a binary file.

    Animated Image Is All Black
    See Null Pointer exception, for the same cause and fixes.

    How to Fix It


    You may have this problem using a 256 color GIF image.  Try converting the image to a full-colored JPG format, see the User's Guide for image tools.
    Netscape Problems
    CoolSlides has some problems with Netscape:

    Netscape 4.0 prevents all Java applets from accessing local drives. It gives a bypass though. Unfortunately, neither the prevention or the bypass works properly. CoolSlides sometimes can not start with Netscape from your local computer.

    How to Fix It:

    • Netscape 4.5 that is now available for download has fixed these problems. Download Netscape 4.5 PR to run CoolSlides.
    • If you have Netscape 3.xx or Microsoft Internet Explorer, use that browser to run CoolSlides locally.
    • Read the Netscape security settings to understand the options and the risks, and use the PrefWrangler to change your Netscape security settings to allow CoolSlides to access local files.
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