Applets strarting a browser on client machine

Hi,
Can an applet start a new instance of a browser ? I think it can't and that's what the docs abt java security say too.
But is there a way to do that ?
Can they exec processes under any circumstances or by any means ?
Will signing an applet make a difference ? Or having an applet loaded from the file system in a small intranet environment ( this is just a long shot though )?
Thanks in advance.
Thanks
Vikas

Yes, it can. A fully commented and worked example of this ought to have come with your compiler.
Hope this helps, SpinyNorman.

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hi,
If you are using english language and need other font to display something special character you have to provide link to the font file.
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consider the following situation:
a web application is running on client PC, and on click of a button, i have to generate a report in some format and insert some images in that report which are on clients local drive and their path is known to me say C:\ myimage.jpg.
if the mages were on the server(where web application is hosted), then its not a prob.
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Sign the applet.
http://forum.java.sun.com/thread.jspa?forumID=63&threadID=524815
second and last post

Unable to view Applet in client machine.

I have one jsp (Main.jsp) in which i am embedding One.Class file by using the following tag:
<applet codebase = "http://localhost:8080/ExceleRATE/" code="One" height="350" width="650" alt="Applet Not Supported by this Browser" archive="http://localhost:8080/ExceleRATE/dom4j-1.6.1.jar,http://localhost:8080/ExceleRATE/One.jar">
This applet (One.java) reads the XML file and displays the data in tree structure.
I kept the One.class file, and all the jar files in the same folder where jsp is there. All the files are in tomcat/webapps/ExceleRATE (project folder).
This is working fine in the machine where i am running tomcat(for running applets separate setting neet to be made for java.policy file ..that i did in my machine and client machine....), but not working from the different machine, i.e client machine (here my machine will act as server).
I am getting the following error in client machine:
load: class One not found.
java.lang.ClassNotFoundException: One
     at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)
     at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)
     at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
Caused by: java.net.ConnectException: Connection refused: connect
     at java.net.PlainSocketImpl.socketConnect(Native Method)
     at java.net.PlainSocketImpl.doConnect(Unknown Source)
     at java.net.PlainSocketImpl.connectToAddress(Unknown Source)
     at java.net.PlainSocketImpl.connect(Unknown Source)
     at java.net.SocksSocketImpl.connect(Unknown Source)
     at java.net.Socket.connect(Unknown Source)
     at sun.net.NetworkClient.doConnect(Unknown Source)
     at sun.net.www.http.HttpClient.openServer(Unknown Source)
     at sun.net.www.http.HttpClient.openServer(Unknown Source)
     at sun.net.www.http.HttpClient.<init>(Unknown Source)
     at sun.net.www.http.HttpClient.New(Unknown Source)
     at sun.net.www.http.HttpClient.New(Unknown Source)
     at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(Unknown Source)
     at sun.net.www.protocol.http.HttpURLConnection.plainConnect(Unknown Source)
     at sun.net.www.protocol.http.HttpURLConnection.connect(Unknown Source)
     at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
     at java.net.HttpURLConnection.getResponseCode(Unknown Source)
     at sun.plugin2.applet.Applet2ClassLoader.getBytes(Unknown Source)
     at sun.plugin2.applet.Applet2ClassLoader.access$000(Unknown Source)
     at sun.plugin2.applet.Applet2ClassLoader$1.run(Unknown Source)
     at java.security.AccessController.doPrivileged(Native Method)
     ... 7 more
Exception: java.lang.ClassNotFoundException: One
Can you please help me where I am doing wrong.
Thank in Advance..

Wherever you use http://localhost:8080 in your applet tag, it means:
"Browser, would you please download the applet from the web server running on the same machine as yourself on port 8080".
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Hi there,
I created an applet which is DRAG and DROP enabled. In this applet content page i am dropping some file and trying to copy the same files in to the server. But when i am trying to save the files my code is saving the files in clients machine.
I thought we are embedding the applet in a browser and the applet is running in clients machine, so for the applet SERVER is the local machine and if we create any files then they will be created in SERVER machine.
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I SIGNED THE APPLET TO ACCESS THE CLIENT MACHINE FILES TO DRAG AND DROP INTO MY APPLET. THAT IS NOT A PROBLEM , BUT COPYING THE FILES FROM CLIENT MACHINE TO SERVER HAS BECOME A BIG PROBLEM
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The applet must be signed?
Thanks in advance, el tano. <aguante boca, che>

One way to load a class from a file on a client's machine would be to read the class file bytecodes into your own ClassLoader and have it convert them to a JVM class. Your applet would have to have FilePermission to read files on the client machine. To keep the plugin from trying to get the class from the server, you would probably have to use reflection.
I don't know how to tell the java plugin to do it.

Can Web Start call earlier installed versions on client machine?

Can Web Start invoke earlier installed versions of the
JRE on a client machine, without invoking a download?
I ask because I have tried to so, unsuccessfully,
using the versions attribute of the j2se element.
In the usenet thread 'Jar test, with 1.4 VM?',
Usenet Message ID:
[email protected]
http://groups.google.com/groups?selm=1170640609.025666.236030@s48g2000cws.googlegroups.com
(follow the Google link at the top, to the thread)
I was attempting to confirm that a Jar file I
was deploying, was 1.4 compatible.
The test failed, because despite that the (1)
user who attempted it had a working 1.4.2 install,
the JNLP file (which declared version='1.4'),
was prompting for a download. The user was
not prepared to do that, understandably -
that was exactly what I was trying to avoid
doing, myself.
Since then, I did further testing locally -
trying to get a 1.5 launch when my current
Java is 1.6 - I have a number of 1.5 versions.
No request for '1.5', '1.5.0_08' or '1.5*' worked
(OK - that last one was just a WAG*), every time
I was prompted for download (which also failed,
as an aside!).
What am I getting wrong?
Do I misunderstand the intent of the j2se element
finding earlier verions? Is it only versions that
were installed by web start?
Is my understanding of how to use the version
attribute, incorrect?
* Where are the detailed instructions on the
allowable forms of the version attribute?
Neither the spec. nor developers guide seem
to go into it in any detail. Some of the forms
I have seen around the forum were (AFAIR)..

version="1.4 1.5+"

version="1.4"

version="1.4.2_13+ 1.5+"FWIW - here is the JNLP I am currently using
for the test, it is 'live and public'..
<?xml version='1.0' encoding='UTF-8' ?>

<jnlp spec='1.0'
    codebase='http://www.athompson.info/family/'
    href='thompson-1.4.jnlp'>
<information>
    <title>Thompson Family Genealogy</title>
    <vendor>Andrew Thompson</vendor>
    <description kind='one-line'>
      The ancestors of William Robert Ramshaw Thompson
    </description>
    <offline-allowed />
    <shortcut online='false'>
      <desktop/>
    </shortcut>
</information>
<resources>
    <j2se
      version="1.4"
      href="http://java.sun.com/products/autodl/j2se" />
    <jar href='genj-applet.jar' main='true' />
</resources>
<applet-desc
    main-class='genj.applet.Applet'
    name='genealogy'
    codebase='./index.html'
    width='300'
    height='170'
    >
      <param name='GEDCOM' value='thompson.ged' />
      <param name='ZIP' value='thompson.zip' />
</applet-desc>
</jnlp>

Using your tips, I was able to find the 1.5
JRE's listed in the Java control panel
(of an XP Pro box) and see they had no
checkmark for 'enabled'.
After enabling 1.5.0_08, I was successfully
able to launch the application (OK - applet
really) using the 1.5.0_08 JRE.
Thanks.
As an aside, I had to specify '1.5.0_08'
exactly to get that JRE. This is fine for
local testing, but sometimes it is handy
to ask others to help test via the web,
and it would be nice if I could make it less
specific (e.g. '1.5', to get any installed
and enabled JRE that is a 1.5 variant)
Do I understand wrong? Should that work,
to specify '1.5' and get a '1.5.0_08' JRE that
is installed and enabled?

Problem viewing applet in a browser

Hi guys,
i'm facing a basic problem in viewing an applet in a browser say
IE or netscape. beside adding the applet tag to the html file that i want to browse ;is there any other operation to perform on browsers or the Applet in order to view it ?
i would be very grateful if you help me fix this!
thanks indeed
othman

- Is there a plugin installed on the client machine
- Is the browser java enabled
- What tags are you using .. show your html code
- Are you aware of the security restrictions of the applet and its sandbox
- Are you able to view the console. What exceptions do you see if any.. show your exceptions
- What version of IE or Netscape are you testing with
- What OS are you using, what jvm version..
- Is the plugin set to be used with IE and Netscape in the Plugin control panel
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Applets strarting a browser on client machine

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