Open browser using japplet

I am trying to open an url in a new browser in a japplet.
Itried the following code:
getAppletContext().showDocument(new URL("http://somewhere/somefile", "_blank);but a NullPointerException is caught
Why?

This is my code:
try
{System.out.println("1");
     getAppletContext().showDocument(new java.net.URL("http://somewhere/index.html"), "_blank");
     System.out.println("2");
catch (java.net.MalformedURLException ue)
     System.out.println("Error"+ue);
}The "1" was printed but the "2" wasn't.
This is the stack trace
1
Exception occurred during event dispatching:
java.lang.NullPointerException
     at java.applet.Applet.getAppletContext(Unknown Source)
     at Main.runReport(Main.java:74)
     at CAT_SYS_SEARCH.actionPerformed(CAT_SYS_SEARCH.java:177)
     at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
     at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(Unknown Source)
     at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
     at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
     at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
     at java.awt.Component.processMouseEvent(Unknown Source)
     at java.awt.Component.processEvent(Unknown Source)
     at java.awt.Container.processEvent(Unknown Source)
     at java.awt.Component.dispatchEventImpl(Unknown Source)
     at java.awt.Container.dispatchEventImpl(Unknown Source)
     at java.awt.Component.dispatchEvent(Unknown Source)
     at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
     at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
     at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
     at java.awt.Container.dispatchEventImpl(Unknown Source)
     at java.awt.Component.dispatchEvent(Unknown Source)
     at java.awt.EventQueue.dispatchEvent(Unknown Source)
     at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
     at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
     at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
     at java.awt.EventDispatchThread.run(Unknown Source)
Seems that this wasn't caught in the catch block where it would have printed "Error" before these
Thanx for helping

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WHEN 'EXIT200'.
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g_wa_sflight-traffic_light = '1'.
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ELSEIF g_wa_sflight-paymentsum => 100000 AND
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g_wa_sflight-traffic_light = '2'.
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CALL METHOD go_grid->refresh_table_display.
CALL METHOD cl_gui_cfw=>flush.
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chk this blog
/people/vijaybabu.dudla/blog/2006/07/21/topofpage-in-alv-using-clguialvgrid
with regards,
Hema Sundara.
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