Problem with my applet-servlet comunication

Hello:
I'm using a dynamic chart on my applet, which gets the data from a servlet, by URLConnection. These service work, but after a moment, the chart scroll is stopped and I get the next error on java console:
java.security.AccessControlException: access denied (java.net.NetPermission
getProxySelector)
at
java.security.AccessControlContext.checkPermission(AccessControlContext.java
:264)
at java.security.AccessController.checkPermission(AccessController.java:427)
at
java.lang.SecurityManager.checkPermission(Ljava.security.Permission;)V(Unkno
wn Source)
at
sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:6
61)
at jfch.AppletGraphic$DataGenerator.sendCommand(AppletGraphic.java:307)
at jfch.AppletGraphic$DataGenerator.actionPerformed(AppletGraphic.java:259)
at javax.swing.Timer.fireActionPerformed(Timer.java:271)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
at
java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.ja
va:234)
at
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java
:163)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
at java.awt.EventDispatchThread.run(EventDispatchThread.
The applet make request to servlet by URLConection permanently, which gets
the data from SQL Server.
I'm using JVM 1.5.
The applet makes requests to servlet by normally url, not access to local resources (or file system).
Please can anyone help me?
Regards, Ulises.

http://java.sun.com/j2se/1.5.0/docs/api/java/net/ProxySelector.html
Selects the proxy server to use, if any, when connecting to the network resource
referenced by a URL. A proxy selector is a concrete sub-class of this class and is
registered by invoking the setDefault method. The currently registered proxy selector
can be retrieved by calling getDefault method.
The getDefault Throws:
SecurityException - If a security manager has been installed and it denies
NetPermission("setProxySelector")
http://java.sun.com/j2se/1.5.0/docs/api/java/net/NetPermission.html
getProxySelector
The ability to get the proxy selector used to make decisions on which proxies
to use when making network connections.
Malicious code can get a ProxySelector to discover proxy hosts and ports on
internal networks, which could then become targets for attack.
I checked my java.policy for my w2k jre 1.5 installation but could not find any specific
NetPermission in there. I never had this problem using URL and URLConnections
in 1.5 but it sounds strange that creating an URL in an applet could throw a
SecurityException with the default jre 1.5 installation (both objects are introduced
since 1.5).
If you are using windows could you open the java control panel and select "use
browser settings" in the General tab after clicking the "Network settings" button?
I have this option in my jre settings and never got that Exception.

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Thanks harmmeijer and mjparme for your responses.
I made some changes to my application and it does not now require the system property information. But now I am getting another exception related to class loader.
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Loading applet ...
Initializing applet ...
Starting applet ...
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Modality pushed
Modality poppedmjparme as to your second point, the action is taking place in the same jar only. No other jar is involved at the stage where I am getting exception.
Thankyou again and will appreciate your help.
AC

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