I am writing a Java applet that communicates with a Java application that will be running on a server. The server will also the same server that serves the applet to users, so there should be no issue with opening a socket connection back to the server.
I am having problems testing my code, however. It works from within the Eclise IDE, but fails when I attempt to run the compiled code on my computer for testing purposes.
That is, the following method works:
-Start Server Application in Eclipse on local computer
-Start Applet in Eclipse (another instance of the program) on same local computer. Applet runs just fine for initial functions (not related to socket communication).
-Applet opens socket connection to server application ("localhost") and sends data just fine. Server application (running from within Eclipse) receives the data and handles it just fine as well.
And the following method does not work:
-Start Server Application compiled and exported from Eclipse (into a JAR file) on local computer
-Start compiled applet in Firefox browser on same local computer. Applet runs just fine for initial functions (not related to socket communication).
-Applet attempts to open socket connection to server application ("localhost"), but fails to do so successfully.
I opened up the Java console and saw this in the output:
"Thread-11" java.security.AccessControlException: access denied (java.net.SocketPermission 127.0.0.1:4444 connect,resolve)
at java.security.AccessControlContext.checkPermission(Unknown Source)
at java.security.AccessController.checkPermission(Unknown Source)
at java.lang.SecurityManager.checkPermission(Unknown Source)
at java.lang.SecurityManager.checkConnect(Unknown Source)
at sun.plugin2.applet.Applet2SecurityManager.checkConnect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.<init>(Unknown Source)
at java.net.Socket.<init>(Unknown Source)
at StopItPanel.Update_Send_Data(StopItPanel.java:625)
at StopItPanel.Update(StopItPanel.java:395)
at StopItPanel.run(StopItPanel.java:236)
at java.lang.Thread.run(Unknown Source)"
My code is very simple. The applet attempts to open a socket connection thusly:
private static String Server_Address = "localhost";private static int Server_Port = 4444;...Socket socket = new Socket(Server_Address, Server_Port);And my server application's relevant code is as follows:
private static int Server_Port = 4444;...try{ // Start the server and open a port server = new ServerSocket(Server_Port); } catch (IOException e) { // Could not start listening to the port as a server System.out.println("Could not listen on port " + Server_Port); System.exit(-1); } ...server.accept();How can I test my code outside of Eclipse, and on my local computer?
Thank you.
