Using sockets with Applet

Hey,
I have a website which has an applet on one of the pages. I put in code that uses a socket to connect to MY computer. ( i want to use my computer as a server which stores data/accounts/etc) A SecurityException was thrown when I tested the applet. Is what I'm trying to do possible? or does something like this have to connect to a server which is on my website?
Thanks

I believe you can run something like this by signing the applet.
And then the user has the option of allowing or disallowing a signed applet to do that kind of thing. I don't know which is the default.

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If you are calling the HTML page containing the Applet as http://localhost then the Applet has to open a socket back to local host.
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passionforjava2 wrote:
...I have issues with applet unable to transmit voice using JMF. i know it is a security issue. As the error on the console says
java.lang.RuntimeException: No permission to capture from applets
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Using bc4j with applets

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[email protected]

Hello,
I'm trying to investigate the same thing.
I want to make a soap-client with PL/SQL with 8i 8.1.6.0.0
Did you succeed some additional information ??
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http://www.oracle.com/technology/tech/webservices/htdocs/samples/dbwebservice/DBWebServices_PLSQL.html
but it only works with 9i.
With 8i the errors encountered were : XMLTYPE undefined
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thank's

Am I able to use Sockets in applets

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Tryed both JDK1.1.8 and JDK1.3.1!
Browser = IE5
Am I able to do any networking with browser at all?

My applet only connects to the server (and port) it was served from! But it still doesn't work... It works fine in an appletviewer but in a Browser I won't even get my GUI up :(
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Using Sockets with BufferedInputStream

Hi,
Many thanks in advance for any help or advice. I have been struggling with this for a while now.
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Thanks.
Regards, Custom
Message was edited by:
custom
Message was edited by:
custom

Come on buddy wake up!
You have a while loop that NEVER exits and exception blocks that don't do anything productive and this error message "ClientData.Error: java.io.IOException: Stream closed" tells you exactly what the problem is.
Do you think maybe you should exit the while loop if an exception is thrown? Do you? Perhaps? Maybe?

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U can use it if u sign the applet. It is a bit trick way though.
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Win socket with applet socket by byte type data network

Server is windock
Client is applet
How do i receive and send byte type data..
What i do using sock type?
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Hi
Search the Forum for "socket", start reading other people questions and answers, i am sure that after spending few hours you will find some answers.
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Using t3s with applets

Hi -
We have a few applets accessing EJB's on WebLogic 5.1 (SP 6) which utilize
"t3" as the protocol and don't have any problem getting Contexts and issuing
requests. However, once we switch to t3s, we get an error indicating that
the server can't be found at t3s://myserver:443. This is not a firewall
problem (we've tested it with no firewall in place), nor does it appear to
be a certificate problem (WL server is running in 128-bit mode with a valid
cert, etc.) Does anyone have any experience running applets and WL,
particularly over t3s? I've included a stack trace below. Thanks in
advance -
Andy
[email protected]
=========================
javax.naming.CommunicationException. Root exception is
java.net.ConnectException: No server found at T3S://myserver:443
at weblogic.rjvm.RJVMFinder.findOrCreate(RJVMFinder.java:161)
at weblogic.rjvm.ServerURL.findOrCreateRJVM(ServerURL.java:200)
at
weblogic.jndi.WLInitialContextFactoryDelegate.getInitialContext(WLInitialCon
textFactoryDelegate.java:195)
at
weblogic.jndi.WLInitialContextFactoryDelegate.getInitialContext(WLInitialCon
textFactoryDelegate.java:148)
at
weblogic.jndi.WLInitialContextFactory.getInitialContext(WLInitialContextFact
ory.java:123)
at javax.naming.spi.NamingManager.getInitialContext(Unknown Source)
at javax.naming.InitialContext.getDefaultInitCtx(Unknown Source)
at javax.naming.InitialContext.init(Unknown Source)
at javax.naming.InitialContext.<init>(Unknown Source)
[applet call stack goes here]
at sun.applet.AppletPanel.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

FYI, I believe we have a legitimate fix, but we're still waiting for an
official stance from WL. The "fix" we've implemented includes the previously
mentioned workaround, plus the layering of SP8 weblogic.security package on
top of SP6.
Andy
"Andrew King" <[email protected]> wrote in message
news:[email protected]...
Hi -
It appears there's a bug with WL's RSA classes in SP6 (RSAKey, RSApkcs1),
128-bit vesion. We've hacked a couple of fixes which appear to work, butI'm
wondering if anyone else can confirm this. Thanks -
Andy
"Andrew King" <[email protected]> wrote in message
news:[email protected]...
Hi -
We have a few applets accessing EJB's on WebLogic 5.1 (SP 6) which
utilize
"t3" as the protocol and don't have any problem getting Contexts andissuing
requests. However, once we switch to t3s, we get an error indicating
that
the server can't be found at t3s://myserver:443. This is not a firewall
problem (we've tested it with no firewall in place), nor does it appearto
be a certificate problem (WL server is running in 128-bit mode with avalid
cert, etc.) Does anyone have any experience running applets and WL,
particularly over t3s? I've included a stack trace below. Thanks in
advance -
Andy
[email protected]
=========================
javax.naming.CommunicationException. Root exception is
java.net.ConnectException: No server found at T3S://myserver:443
at weblogic.rjvm.RJVMFinder.findOrCreate(RJVMFinder.java:161)
at weblogic.rjvm.ServerURL.findOrCreateRJVM(ServerURL.java:200)
at
weblogic.jndi.WLInitialContextFactoryDelegate.getInitialContext(WLInitialCon
textFactoryDelegate.java:195)
at
weblogic.jndi.WLInitialContextFactoryDelegate.getInitialContext(WLInitialCon
textFactoryDelegate.java:148)
at
weblogic.jndi.WLInitialContextFactory.getInitialContext(WLInitialContextFact
ory.java:123)
at javax.naming.spi.NamingManager.getInitialContext(Unknown Source)
at javax.naming.InitialContext.getDefaultInitCtx(Unknown Source)
at javax.naming.InitialContext.init(Unknown Source)
at javax.naming.InitialContext.<init>(Unknown Source)
[applet call stack goes here]
at sun.applet.AppletPanel.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

How to use sockets in applets?

hi,
i wrote the following applet:
http://spidey.bei.t-online.de/rest/java/jtv/jTV.html
its a little applet which asks tvtoday.de for the movies which are running on the channels/time and day you specified and puts them into the table
as a normal java application everything works fine
but as an applet i always get an exception that im not allow to open sockets to tvtoday.de
how comes? and is there a way to fix that?
thx

Applets are only allowed to create sockets back to the host that they originally came from. This is a security measure - otherwise, a trojan horse applet could be downloaded through a firewall, then open connections and do malicious things to hosts that were supposed to be protected by the firewall.
I am not sure if there is a way the solve this. Perhaps you could sign your applet and let java pop up a "Let this applet open sockets elsewhere?" window (similar to what java web start can do), but I personally don't know of such a system.

Using MVC with Applet inside Servlet

Hello fellow Java developers,
I want to implement the Model View Controller concept inside a Bean Applet combination running in a servlet environment.
When my model (the Bean) changes, I want my Applet (the View) to get notified so it can get the update from the Bean. The Applet is incorporated inside the jsp page (e.g. the servlet). The Bean is known inside the jsp. How do I make that same Bean known inside the Applet?
When I create a new Bean during init, or in the constructor of the Applet, I get a complete other reference than the Bean inside the jsp. So, when I ask information from the Bean, I often get NullPointerExceptions, because I am referencing the wrong Bean.
Does anyone have a solution for my problem?
Regards,
Michel

hi,
a servlet is server side object, an applet is client side object.
For the communication, you should try HttpUrlConnection from applet to servlet.
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Problem using SAAJ with Applets

This method to do a SOAP connection call does not work within a Applet -- but it works fine otherwise.
Any help would be appreciated.
Thanks.
public void execute() {
     try {
         SOAPConnectionFactory
          soapConnectionFactory     = SOAPConnectionFactory.newInstance();
         connection               = soapConnectionFactory.createConnection();
         response     = connection.call(request, endpoint);
         connection.close();
     } catch (Exception ex) {
         ex.printStackTrace();
    } Trace follows:
Jun 8, 2006 8:22:12 PM com.sun.xml.messaging.saaj.client.p2p.HttpSOAPConnection post
SEVERE: SAAJ0009: Message send failed
com.sun.xml.messaging.saaj.SOAPExceptionImpl: java.security.PrivilegedActionException: com.sun.xml.messaging.saaj.SOAPExceptionImpl: Message send failed
     at com.sun.xml.messaging.saaj.client.p2p.HttpSOAPConnection.call(HttpSOAPConnection.java:127)
     at imt.util.SOAPTrans.execute(SOAPTrans.java:52)
     at test.util.applet_soap.init(applet_soap.java:54)
     at sun.applet.AppletPanel.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
Caused by: java.security.PrivilegedActionException: com.sun.xml.messaging.saaj.SOAPExceptionImpl: Message send failed
     at java.security.AccessController.doPrivileged(Native Method)
     at com.sun.xml.messaging.saaj.client.p2p.HttpSOAPConnection.call(HttpSOAPConnection.java:121)
     ... 4 more
Caused by: com.sun.xml.messaging.saaj.SOAPExceptionImpl: Message send failed
     at com.sun.xml.messaging.saaj.client.p2p.HttpSOAPConnection.post(HttpSOAPConnection.java:325)
     at com.sun.xml.messaging.saaj.client.p2p.HttpSOAPConnection$PriviledgedPost.run(HttpSOAPConnection.java:150)
     ... 6 more
Caused by: java.security.AccessControlException: access denied (java.lang.RuntimePermission setFactory)
     at java.security.AccessControlContext.checkPermission(Unknown Source)
     at java.security.AccessController.checkPermission(Unknown Source)
     at java.lang.SecurityManager.checkPermission(Unknown Source)
     at java.lang.SecurityManager.checkSetFactory(Unknown Source)
     at java.net.HttpURLConnection.setFollowRedirects(Unknown Source)
     at com.sun.xml.messaging.saaj.client.p2p.HttpSOAPConnection.post(HttpSOAPConnection.java:239)
     ... 7 more
CAUSE:
java.security.PrivilegedActionException: com.sun.xml.messaging.saaj.SOAPExceptionImpl: Message send failed
     at java.security.AccessController.doPrivileged(Native Method)
     at com.sun.xml.messaging.saaj.client.p2p.HttpSOAPConnection.call(HttpSOAPConnection.java:121)
     at imt.util.SOAPTrans.execute(SOAPTrans.java:52)
     at test.util.applet_soap.init(applet_soap.java:54)
     at sun.applet.AppletPanel.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
Caused by: com.sun.xml.messaging.saaj.SOAPExceptionImpl: Message send failed
     at com.sun.xml.messaging.saaj.client.p2p.HttpSOAPConnection.post(HttpSOAPConnection.java:325)
     at com.sun.xml.messaging.saaj.client.p2p.HttpSOAPConnection$PriviledgedPost.run(HttpSOAPConnection.java:150)
     ... 6 more
Caused by: java.security.AccessControlException: access denied (java.lang.RuntimePermission setFactory)
     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.checkSetFactory(Unknown Source)
     at java.net.HttpURLConnection.setFollowRedirects(Unknown Source)
     at com.sun.xml.messaging.saaj.client.p2p.HttpSOAPConnection.post(HttpSOAPConnection.java:239)
     ... 7 more
CAUSE:
java.security.PrivilegedActionException: com.sun.xml.messaging.saaj.SOAPExceptionImpl: Message send failed
     at java.security.AccessController.doPrivileged(Native Method)
     at com.sun.xml.messaging.saaj.client.p2p.HttpSOAPConnection.call(HttpSOAPConnection.java:121)
     at imt.util.SOAPTrans.execute(SOAPTrans.java:52)
     at test.util.applet_soap.init(applet_soap.java:54)
     at sun.applet.AppletPanel.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
Caused by: com.sun.xml.messaging.saaj.SOAPExceptionImpl: Message send failed
     at com.sun.xml.messaging.saaj.client.p2p.HttpSOAPConnection.post(HttpSOAPConnection.java:325)
     at com.sun.xml.messaging.saaj.client.p2p.HttpSOAPConnection$PriviledgedPost.run(HttpSOAPConnection.java:150)
     ... 6 more
Caused by: java.security.AccessControlException: access denied (java.lang.RuntimePermission setFactory)
     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.checkSetFactory(Unknown Source)
     at java.net.HttpURLConnection.setFollowRedirects(Unknown Source)
     at com.sun.xml.messaging.saaj.client.p2p.HttpSOAPConnection.post(HttpSOAPConnection.java:239)
     ... 7 more
java.lang.NullPointerException
     at imt.util.SOAPTrans.getXMLResponse(SOAPTrans.java:37)
     at test.util.applet_soap.init(applet_soap.java:56)
     at sun.applet.AppletPanel.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)

Solved my own problem.
I was erroneously not signing one of my jar files.
cheers.

Communication between Windows 7 and Windows 8(and above) using Sockets(TCP and UDP)

I need to use TCP and UDP using Sockets to communicate between two(or more) applications installed in Windows 7 and Windows 8.
Is it possible.? I tried within a LAN, but in vain. If needed I would post the appropriate code.
Note: I only tried running exe(s) in these machines and not with installation.

Hello Prabodh.Minz,
>>Is it possible.?
It is not clear what develop language you are using, here are examples which uses the C# based on .NET. It created the communition between two machines by using sockets with TCP protocol, a server and a client:
Synchronous example:
Client and
Server.
Asynchronous example:
Client and
Server.
Multi-client per one server - socket programming in .net(C#)
>>Note: I only tried running exe(s) in these machines and not with installation.
There are all .exe.
Regards.
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Using sockets with Applet

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