To keep an image in the Server

Good morning.
I am using Debian + tomcat + j2sdk1.4.2_10 + jfreechar-1.0.1 ...
I have a doubt on how adding a functionality. I have a page in jsp that loads an Applet, this Applet loads a Servlet which generates a graph with JFreeChart. This works correctly, but in the Servlet I have:
response.setContentType("image/jpeg");
OutputStream myOutStream = response.getOutputStream();
JFreeChart myChart = crearChart();
int ancho = getParamEntero(request,"ancho",400);
int alto = getParamEntero(request,"alto",300);
ChartUtilities.writeChartAsJPEG(myOutStream,myChart,ancho,alto);
ChartUtilities.saveChartAsJPEG(new File("/usr/local/tomcat/webapps/Usuarios/graph1.jpg"), myChart, ancho, alto);
myOutStream.close();
Servlet separately works correctly (it keeps the image in the Server, in the indicated directory). And the Applet also works correctamente( It loads the Servlet and shows the Servlet), but what it does not work to me it is
ChartUtilities.saveChartAsJPEG(new File("/usr/local/tomcat/webapps/Usuarios/graph1.jpg"), myChart, ancho, alto);The image in the Server does not keep (when I do this with the Applet).
Somebody can say to me why does not keep the image?
Thanks.

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To keep an image in the Server

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