Access denied reading "http.proxyHost" withing webstart app

Hi,
some of our users have issues using our webstart app when they have a proxy server. So we want to set the proxy setting manually.
First of all, I try to read out the proxyHost with the following command:
System.getProperty("http.proxyHost");
Running the app in webstart (unsigned), I get this error message:
"access denied (java.util.PropertyPermission http.proxyHost read)"
What do I do incorrectly? Is that a general problem with unsigned webstart apps that I do not get access to this information?
Thanks in advance.
Sebastian

We finally decided to use a signed application since this proxy issue is hardly to be solved without the possibility to read system properties.
Now I want to read out the proxy setting via
System.out.println(System.getProperty("proxySet"));
System.out.println(System.getProperty("proxyHost"));
System.out.println(System.getProperty("proxyPort"));
The problem is that I only get "null" for all of these properties. How can that happen? Someone else told me that the System-Property proxySet, proxyHost, proxyPort do not exist at all.
Thanks in advance.
Sebastian

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