JNI with applet

hello
I want to use JNI with the applet ,could any one give me helloworld applet using JNI
Thank you

hello
I want to use JNI with the applet ,could any one give
me helloworld applet using JNI
Thank youhttp://java.sun.com/sfaq/index.html#prevent

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Transferring files from users mashines on the server. Uploading with applet

I'm trying to create applet that would do uploading of user file on the server.
I'm woundering, Is there any ways to use java applet to open a file on user mashine into a stream and transfer it thought socket into
server? Is there any good solution that do uploading with java applet? (I can't use CGI or PHP)
I just noticed that applets don't support FileInputStream. How could I in general get information from user file?
Ok. Thanks for ideas that you gave me. But there are useless. All that I can use is only HTTP. Unfortunately no FTP, no Web Start application.
looking for help

well, i don't work a lot with applets because of their inherent limitations. but my guess would be that you have to somehow use a signed applet. of course that doesn't help with the FileInputStream problem you are talking about.
if i were going to do it and i couldn't use FTP, i'd write a WebStart app that calls servlets (sending it byte arrays) and the servlets will construct the files on the server...
i have no clue how you are going to do what you want...

JNI with different versions of jdk

Hi
We currently have some JNI code that is running under jdk1.1.8. We are trying to upgrade to jdk1.2.2, and are fidning that the JNI is not working.
Using jdk 1.2.2 I have re-compiled the Java class with the native methods, re-generated the javah header file, and made sure that the C program includes the right version of jni.h.
When we try to call a native method that should return a String, it just returns null.
Can anyone advise me on this - I am at my wits end!
many thanks
Lyndsey

Need a bit more info. I've used JNI with 1.2.2 and it works fine.

A new webcam with applets problems

hi
I have some doubt abot webcam with applets
here are my questions......
1. There is client(s) and server systems.....
webcam is connected to clientside and image from webcam should be captured from
client(s) and to be sent to server ,through web only. Is there are any possibilities to do this
thing without applets..?
if so please tell me abt that..
2. with applets is there any methods to access client webcam without using signed aplets and
certificating (IE such as setting browser are some settings allow all applets in client machine .etc)
3. i heard about we can have our own signature and certificates (without aproved by any CA)
is it possible if so how can we achive that..?
Im a student doing my projects,I have gone through several applets and webcam related JMF forums but all are old dated and may be new technologies arrived and I couldnot able make clear my doubts comfortably...
sorry for rising old topic but
it wold be gracefull if anybody clear my doubts please kindly give me the ans.
thanks in advance

Hi
Let me take a crack at this, :)
1) No
2)Anything that is required to access anything of a clients computer, i.e com ports,files and resources needs a signed applet.
3)http://java.sun.com/developer/technicalArticles/Security/Signed/
And yes you have to work with
http://java.sun.com/products/java-media/jmf/
in order to capture images
HTH
:)

How to use jni with ervlets

Hi
i was trying to do some example with JNI. I can use JNI with standalone Java application but I just cannot figure out how I can use JNI with Servlet.
Can some one show me a sample code using JNI with Servlets.
thanks very much

JNI is done in servlets that same way as other java.
I suspect your problem is in the environment and perhaps how servlets work. It doesn't have anything to do with JNI itself.

How to use JNI with Servlets

Hi
i was trying to do some example with JNI. I can use JNI with standalone Java application but I just cannot figure out how I can use JNI with Servlet.
Can some one show me a sample code using JNI with Servlets.
thanks very much

hi,
I am also facing the same problem,
when I am using JNI with stand alone application it works fine but when i tried to use it with a servlet It gives unsatisfied linker error
stack: java.lang.UnsatisfiedLinkError: createSocket
     at RelayConnector.createSocket(Native Method)
     at RelayServlet.doGet(RelayServlet.java:70)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at com.iplanet.server.http.servlet.NSServletRunner.invokeServletService(NSServletRunner.java:891)
     at com.iplanet.server.http.servlet.NSServletRunner.Service(NSServletRunner.java:458)
It seems i have to do some path settings in my iplenet web server.
If some one have faced the problem i would be glad to know the solution for this, i am literally bugged up,....

Problems with applets.

Hi to everybody.
I've got a problem with simple applets.
I've built several applets using Swing components (JApplet, JPanel, JButton, etc.)
In my browser, the background color of my applets does correctly appear.
But none of my components does !!!! No text fields, no buttons etc.
Can someone explain to me which could be the reason of that ?
Thank's.

I've just tried appletviewer. And I discovered that there is a problem while trying to acces to a jpeg file for my JBuutons and JLabel.
Appletviewer considers these files are on the client machine and refuses the acces.
But when I try my site, the server is my computer too ! So the jpegs are on the server side !
Furthermore, when I start my web page (that contains my applets), nothing does appear (no exception) in the java console...
How can I solve this problem (I'm newer with applets)?

How to include ojdbc.jar with applet in apex

Hi,
I am integrating applet with apex. I need to use ojdbc.jar to connect to Database. How can i include this jar. I tried uploading it as a static file. But i am not sure how to embed it with applet code in region source of a page. I am using following code to embed the applet.
<applet code="TestApplet.class" archive="#APP_IMAGES#Test.jar" width="500" height="500">
</applet>
Please suggest how to include the ojdbc.jar.
Regards,
Shweta

Thank you all for help, from your posts I was able to get the datepicker working with a different version of jQuery (but not jQueryUI) included on the page. There are two methods:
1. Include the new library before #HEAD# and change the reference to a different variable, for example:
<script src="jquery-1.6.4.min.js" type="text/javascript"></script>
<script type="text/javascript">
var jq164 = jQuery;
</script>
#HEAD#2. Include the new library after #HEAD# and enable noConflict() mode, for example:
#HEAD#
<script src="jquery-1.6.4.min.js" type="text/javascript"></script>
<script type="text/javascript">
var jq164 = jQuery.noConflict(true);
</script>In both examples above, $, jQuery and apex.jQuery point to apex jQuery, while jq164 points to the new one.
However, I couldn't manage to include a newer version of jQueryUI. I only found a page ([url http://stackoverflow.com/questions/6358961/using-multiple-jquery-ui-versions]http://stackoverflow.com/questions/6358961/using-multiple-jquery-ui-versions) that says you have to specify a different context for each version of jQueryUI included on the same page. I haven't yet had time to look at this, so if anyone already knows how to do it, it would be really nice to share it with us.
Regards,
Jure

Saving a file with applets

Hello my name is Lino and I'm Portuguese (sorry the bad English)
I have a problem, I want to know how do save a .jpg file with the FileChooser and FileWriter, that is in the Server and I want to save a copy in my computer, but it must with Applets!
Please help me
Tanks
LP

Hi,
because of security resons with applets, it is not possible to store an .jpg on your hard drive.
Bernd

I/O with applets

From what I have found, file I/O is apparently not allowed with applets; when I try it, I get this "access denied" or something error/exception.
I would understand why that is...but is there REALLY no way to do file I/O with applets, or any way around it (maybe you can get permission somehow)?

A sandbox security feature prevents unsigned applets from accessing your filesystem. For more information see:
http://java.sun.com/docs/books/tutorial/security1.2/tour1/index.html
or this forum:
http://forum.java.sun.com/thread.jsp?thread=221840&forum=63&message=1977008

Security Exception with applets

Hello,
How do I overcome the securityexception I face with applets? My appletviewer works fine when I try to read data from a local text file. But the browser doesn't seem to. It says access to the text file is denied!!!

Appletviewer works but only in debug, isn't it?
If you can read file from local, you must sign you applet by jarsigner tool contributed in your JDK.
If you have not certificate for sign, you can generate your own certificate:
1.generate key (name of the key will be tstkey)
keytool -genkey -keyalg rsa -alias tstkey
2. complete data
3. export key (will be in your current directory in file tstcert.crt)
keytool -export -alias tstkey -file tstcert.crt
4. make *.jar file
jar cvf MyApp.jar
5. check *.jar file
jar tvf MyApp.jar
6. sign applet
jarsigner MyApp.jar tstkey
7. check sign of applet
jarsigner -verify -verbose -certs MyApp.jar
Tha is all. At this moment is your applet signed and you can write or read local file.
BR
-koalix-

Using javaagents with applets

Is it possible to use javaagents with applets?
If it is, how?

FYI... my environment is:
Oracle9iAS (9.0.3.0.0)
JDeveloper (9.0.3.4)

Use XML Digital Signature(Apache XML security) with Applet

I have problem when I use xml-security-1_2_1 library from Apache with applet and access denied errors occur.
6 May 2005 10:06:45 org.apache.xml.security.Init init
SEVERE: Bad:
java.security.AccessControlException: access denied (java.util.PropertyPermission org.apache.xml.security.resource.config read)
bla bla....
How should I do ? Please! T_T and thank you ..

An applet cannot read the local file system, connect to any other computer than the one
it came from or read properties it's not supposed to read. And I think it cannot write to any
property.
If you sign the applet or set up a policy for it the applet can do the same as an application
allthough the jre will still check the stack trace if the entire stack has the same privileges
as you signed applet.
http://forum.java.sun.com/thread.jsp?forum=63&thread=524815
second post and last post for the java class file

How to Intergrate Policy with applet

hi my name is easan. I created an applet which reads and writes to a file but i had problems accessing the file. I solved that by granting read and write permission to the file by creating a policy. I can run the applet in the appletviewer using this line
c:\>appletviewer -J-Djava.security.policy=<policyname> applet.html
I would like to know hw to intergrate this policy with my applet so that i can run my applet from a browser.
I would appreciated any help from anyone..... thank you in advance.
Easan

It's not possible to integrate policy file together with applet. If you want to perform these dangerous operation (read,write) from applet, you have to sign applet's jar file. And in applet's code you have to use AccessController.doPrivileged(PrivilegedAction action) for possibly unsafe parts of code.
tina

Printing with applet

hi
i am trying to print some text with applet but it is not working here is my code
sMsg="printing a applet is tough job";
// Find the default service
DocFlavor flavor = DocFlavor.BYTE_ARRAY.AUTOSENSE;
PrintService service[]= PrintServiceLookup.lookupPrintServices(flavor, null);
// Create the print job
byte[] b=sMsg.getBytes();
DocPrintJob job = service[0].createPrintJob();
Doc doc = new SimpleDoc(b, flavor, null);
try{
job.print(doc, null);
}catch(Exception e){System.out.print(e.getLocalizedMessage());}
it is not doing anything not even the error is displayed
when i execute this code i get dialog box which ask me to allow this applet to print or not but after that ,nothing happens.
plz help me.
thanks in advance.

Hans,
I came across a similar problem a few months ago. I came up with a work-around, and although it's not great, it met the demands of my current project.
A normal applet can't write files to a user's computer because that could create some big security problems. However, an applet can communicate with the server on which it's located. SO, I created a servlet that resides on the same server. When the user wants to print something from the applet, he clicks a Print button which opens a URLConnection and sends the data to the servlet. The servlet then creates an HTML document on the server and formats the data nicely. Then, back in the applet, I used this line to open a new browser window and show the HTML file:
getAppletContext().showDocument(new URL(theUrl), "_blank")
The user can then use the browser's print function to print the data.
I know it's kind of a roundabout way, but I was pressed for time. Let us know if you come up with something better.
-sheepy.

JNI with applet

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