Possible to check in Java, if if a package is already in the jar-Cache?

I have an applet, that has only one main.jar in the Cache-Archive parameter.
Because I wanted to reduce the preload-Time, since 1.4.0 I use an index.list file, listing
the rest of jar-Files needed for my applet. So the jar-Files will be only
downloaded to the time, they are needed, if they aren't already in the jar-cache.
The Problem: If the applet needs a new jar-File, that isn't in the jar-Cache, it needs
time to download the package. But the user doesn't see that something happens.
Is it possible to check with JAVA in the applet, if a package is already in the jar-Cache?
If i know this, I'll be able to show the user that the applet is currently downloading a package.

do u mean a file in the JAR?
if yes, yes u can check that.
check this,
public ImageIcon loadImage(String location)
java.net.URL url = null;
url = getClass().getResource(location);
if (url == null) then ...
}

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How do I remove the Java 1.6.0_41 update from App Store updates list without actually installing it? I don't want to revert to an older Java than what I got from Oracle just a week ago (Java "1.7.0_11").
You should not ignore it as that will leave you with an unsafe version of Java SE 6 integrated into your system. If you shoud ever need to revert from Java 7 to Java 6 (which many users have found necessary for compatibility reasons) that would leave you open to attack. It's very difficult to remove Java 6 so you might as well keep it up-to-date.
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Possible to check in Java, if if a package is already in the jar-Cache?

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