RE: Can we use XML RPC Client within an Applet

James Carroll Wed, 18 May 2005 06:21:30 -0700

Title: RE: Can we use XML RPC Client within an Applet

Hi Sumeet,

The applet can be an XML-RPC client, and it can make requests to other machines, the trick

is that the applet make the request back to the originating machine (the one with the web page

and the applet…)�� but make the request to something that will proxy the request to the other

machine, receive the result, and then return that result to your applet.� You can use a Directory

directive in apache.conf with mod_proxy to do the proxying… �(but be careful you don’t let it

proxy any request from anywhere to anywhere, hackers will use this to anonymize their traffic.)

There are other ways of having something on your originating server return the results from

another machine too… �a java servlet would look something like:

�� URL url = "" URL(ourRequest);

�� URLConnection connection = url.openConnection();

�� BufferedInputStream bis = new BufferedInputStream(connection.getInputStream());

�� OutputStream binout = null;

�� byte[] storage = new byte[storageLength];

�� binout = response.getOutputStream();

�� // relay whatever content type is returned from our request

�� response.setContentType(connection.getContentType());

�� while (true)

�� {

�� int bytesRead = bis.read(storage, 0, storageLength);

�� if (bytesRead == -1)

�� {

�� break;

�� }

�� binout.write(storage, 0, bytesRead);

�� ….

(not a working example.)

-Jim

From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Sent: Wednesday, May 18, 2005 12:44 AM
To: [email protected]
Subject: RE: Can we use XML RPC Client within an Applet

Hi andreas,
Is the server the applet tries to connect to the same one it (the applet) originated from ?
A: No. It is a different machine.

Rgds,
Sumeet
-----Original Message-----
From: "Sch�lver, Andreas" [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, May 17, 2005 4:56 PM
To: '[email protected]'
Subject: RE: Can we use XML RPC Client within an Applet

Is the server the applet tries to connect to the same one it (the applet) originated from ?

Andreas
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]
Sent: Sunday, May 15, 2005 7:33 AM
To: [email protected]
Subject: Can we use XML RPC Client within an Applet
Hi all,
I am using XML RPC Version 1.2 b1 and it is giving such an error when I access xml rpc requests from an applet. It works fine until I have been running as a standalone client, but when I wrap it up as an applet it gives the following error message. Could anyone tell me what am I doing wrong.

java.security.AccessControlException: access denied (java.util.PropertyPermission org.apache.xmlrpc.TypeFactory read)
            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.checkPropertyAccess(Unknown Source)
            at java.lang.System.getProperty(Unknown Source)
            at org.apache.xmlrpc.XmlRpc.<init>(XmlRpc.java:200)
            at org.apache.xmlrpc.XmlRpcClient$Worker.<init>(XmlRpcClient.java:325)
            at org.apache.xmlrpc.XmlRpcClient.getWorker(XmlRpcClient.java:234)
            at org.apache.xmlrpc.XmlRpcClient.execute(XmlRpcClient.java:160)
            at MyApplet$20.actionPerformed(MyApplet.java:2236)
            at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
            at javax.swing.AbstractButton$Handler.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.AWTEventMulticaster.mouseReleased(Unknown Source)
            at java.awt.Component.processMouseEvent(Unknown Source)
            at javax.swing.JComponent.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.pumpEvents(Unknown Source)
            at java.awt.EventDispatchThread.run(Unknown Source)
Thanks,
Sumeet

RE: Can we use XML RPC Client within an Applet

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