Communication Applet - Servlet

Question

Hello,
I'm trying to do a communication Applet - Servlet.
When i'm typing in my browser internet explorer
http://pcsm1:8080/servlet/MyServlet
My servlet is invoqued perfectly and i see the good message in the prompt ms-dos (cf MS-DOS PROMPT : MESSAGE OF THE SERVLET!)
But when i'm trying with my applet, i have a security exception : cannot access "pcsm1":8080
SERVLET :
public class MyServlet extends HttpServlet
public void init(ServletConfig config)
System.out.println("Servlet Init");
public void doGet(HttpServletRequest request,HttpServletResponse response)
ObjectOutputStream outputToApplet;
long data=69;
try
outputToApplet = new ObjectOutputStream (response.getOutputStream());               System.out.println("Sending data to applet...");
outputToApplet.writeLong(data);
outputToApplet.flush();
outputToApplet.close();
System.out.println("Data transmission complete.");
catch (IOException e)
public void doPost(HttpServletRequest request,HttpServletResponse response)
APPLET :
public class MyApplet extends Applet
public void init()
try
URL url = new URL("http://pcsm1:8080/servlet/MyServlet");
or
URL url = new URL(getCodeBase(),"http://pcsm1:8080/servlet/MyServlet");
URLConnection servletConnection = url.openConnection();
servletConnection.setDoInput(true);
servletConnection.setDoOutput(true);
servletConnection.setUseCaches (false);
servletConnection.setDefaultUseCaches (false);
servletConnection.setRequestProperty("Content-type","application/octet-stream");
ObjectInputStream inputFromServlet = new ObjectInputStream(servletConnection.getInputStream());
data = inputFromServlet.readLong();
inputFromServlet.close();
catch (Exception e)
MS-DOS PROMPT : MESSAGE OF THE SERVLET
when caller is internet explorer
C:\Servlet\bin>servletrunner -d "c:\servlet\bin"
servletrunner starting with settings:
port = 8080
backlog = 50
max handlers = 100
timeout = 5000
servlet dir = c:\servlet\bin
document dir = .\examples
servlet propfile = c:\servlet\bin\servlet.properties
Servlet Init
Sending data to applet...
Data transmission complete.
What can i do to avoid my security exception problem?
Very thanks...

Answer 1

Are MyServlet and the HTML page hosting MyApplet being served from the same server (i.e., pcsm1:8080)? If not, this is a violation of one of the security constraints placed on unsigned applets.
If the above scenario is the case, there are three options to overcome:
1) Create a signed applet
2) Move the HTML/Applet to the same server as the Servlet
3) On the server serving the HTML/Applet, create a "proxy" servlet to which the applet can connect and which will in turn contact MyServlet (through HttpURLConnection)