Applet file i/o

hi. i'm new to java (coupla weeks), and i want to write an applet that reads adn writes a server-side file. i can do this with an application no problem, but i think it doesn't work with my applet because of security issues.
i have an idea that maybe what i need to do is get the URL of the file, then open a connection to it and use Input/OutputStreams. am i on the right track?
also, to get the URL, can i just give it the name of the file, if the applet resides in the same directory?
any answers/ sample code dealing with URLs and file i/o would be extremely helpful. thanx ~L

Actually, you need to write a server-side application to do that for you... An applet cannot write to a file on the server (nor on your computer without signing it for that matter). Started to write a program but figured out that I didn't have time... But basically the point is that you can't directly use a URLOutputStream to write to a file... You need to create an application that runs on the computer that holds the file that will accept input and then write to a file.
GN
P.S. I can tell you that I certainly didn't get into this in my first couple weeks :)

Similar Messages

JRE 1.7 / Java Plug-in - Long delay in retrieving the applet File(JAR) due to a request to the Domain Controller(on port 53)

Description:
A specific group of users/customers (using Windows7 OS with IE and FireFox web browsers) are facing problems with retrieving the applet File, after they upgraded the JRE on the system(PC) to JRE 1.7.0_25-b17 from JRE version 1.6.0_29-b11.
With JRE 1.7.0_25-b17 it is noticed that when the Java plugin requests for the applet File; it sends a request to the Domain Controller of the user, which causes a delay of 2 to 5 minutes and sometimes hangs. The problem occurs consistently.
The current temporary workaround for this group of users is to use JRE version 1.6.0_29-b11.
Problem analysis:
To investigate the problem the below steps were executed:
1) Collected the Java console outputbelow details from the user's system. (The complete output is not posted due to lengthy content, though can be added further to this post if required.)
(a) Works fine with JRE version 1.6.0_29-b11. Kindly refer to Java console output in the code ‘section A’ towards the end of this post.
(b) The problem occurs with problem with JRE version 1.7.0_25-b17. Kindly refer to Java console output in the code ‘section B’ towards the end of this post. The step where the problem is observed, is indicated as(##<comment>##).
2) The network settings in the user's browser was checked. Internet Options > Connections > LAN setting
The configured option is 'Use automatic configuration script' and the value is http://www.userAppX.com/proxy.pac
This configuration remains the same irrespective of the JRE version in use.
3) The network settings in the Java Control Panel was checked.
The used/selected option is "Use browser settings", although values for 'Use proxy server' and 'use automatic proxy configuration script' are filled-in as 'user-proxy.com' and 'http://www.userAppX.com/proxy.pac' respectively.
This configuration remains the same irrespective of the JRE version in use.
4) The proxy PAC file was checked and debugging was done for the request 'https://myAppletHost.com/download/...'. The FindProxyForUrl function (including the conditions defined in it, for the hostname and domain checks) returns PROXY user-proxy.com:80
5) The user also tried the below
a. Changed the option in the network settings in the browser to 'Proxy server' with Address 'user-proxy.com' and Port '80'
b. Restarted the browser.
c. Tried with Java Plug-in 1.6.0_29, JRE version 1.6.0_29-b11. There was no problem and no request to the Domain Controller of the user.
d. Tried with Java Plug-in 10.40.2.43, JRE version 1.7.0_40-b43. The problem occurs with the delay and a request to the Domain Controller of the user is observed.
Kindly refer to Java console output in the code ‘section C’ towards the end of this post.
6) The user also tried setting the below property in the Java Control panel; restarted the browser, and try with JRE 1.7.0_40-b43. The problem stil persists.
-Djava.net.preferIPv4Stack=true
7) The Global Policy Management of the Domain Controller was verified by the user. It has GPO for proxy setting but nothing related to Java security.
Questions:
The problem seems be specific to a particular (user) environment setup, and the user faces the problem when using JRE 1.7.
We would like to know if the issue is in the (user) environment setup or in JRE 1.7.
Could you please help with information/ideas/suggestions to identify the root cause and solution for this problem?
Section A:
Java Plug-in 1.6.0_29
Using JRE version 1.6.0_29-b11 Java HotSpot(TM) Client VM
User home directory = C:\Users\userA
basic: Plugin2ClassLoader.addURL parent called for https://myAppletHost.com/download/myApplet.jar
network: Connecting https://myAppletHost.com/download/myApplet.jar with proxy=HTTP @ user-proxy.com/194.xxx.xx.xx:80
network: Server https://myAppletHost.com/download/myApplet.jar requesting to set-cookie with "BCSI-CS-b1bb5056c5b0e83f=2; Path=/"
network: Server https://myAppletHost.com/download/myApplet.jar requesting to set-cookie with "BCSI-CS-b1bb5056c5b0e83f=2; Path=/"
security: Loading Root CA certificates from C:\Program Files (x86)\Java\jre6\lib\security\cacerts
security: Loaded Root CA certificates from C:\Program Files (x86)\Java\jre6\lib\security\cacerts
security: Loading SSL Root CA certificates from C:\Program Files (x86)\Java\jre6\lib\security\cacerts
security: Loaded SSL Root CA certificates from C:\Program Files (x86)\Java\jre6\lib\security\cacerts
security: Loading certificates from Deployment session certificate store
security: Loaded certificates from Deployment session certificate store
security: Loading certificates from Internet Explorer ROOT certificate store
security: Loaded certificates from Internet Explorer ROOT certificate store
security: Checking if certificate is in Deployment denied certificate store
network: Connecting https://myAppletHost.com/download/myApplet.jar with cookie "JSESSIONID=0000IK4bEMoqXH10zsl88rwvoRI:175oe9tjd; BCSI-CS-b1bb5056c5b0e83f=2"
network: Downloading resource: https://myAppletHost.com/download/myApplet.jar
                Content-Length: 403.293
                Content-Encoding: null
Dump system properties ...
https.protocols = TLSv1,SSLv3
java.vm.info = mixed mode, sharing
java.vm.name = Java HotSpot(TM) Client VM
java.vm.specification.name = Java Virtual Machine Specification
java.vm.specification.vendor = Sun Microsystems Inc.
java.vm.specification.version = 1.0
java.vm.vendor = Sun Microsystems Inc.
java.vm.version = 20.4-b02
javaplugin.nodotversion = 160_29
javaplugin.version = 1.6.0_29
javaplugin.vm.options =
os.arch = x86
os.name = Windows 7
os.version = 6.1
trustProxy = true
deployment.proxy.auto.config.url = http://www.userAppX.com/proxy.pac
deployment.proxy.bypass.local = false
deployment.proxy.http.host = user-proxy.com
deployment.proxy.http.port = 80
deployment.proxy.override.hosts =
deployment.proxy.same = false
deployment.proxy.type = 3
deployment.security.SSLv2Hello = false
deployment.security.SSLv3 = true
deployment.security.TLSv1 = true
deployment.security.mixcode = ENABLE
Section B:
Java Plug-in 10.25.2.17
Using JRE version 1.7.0_25-b17 Java HotSpot(TM) Client VM
User home directory = C:\Users\userA
basic: Added progress listener: sun.plugin.util.ProgressMonitorAdapter@12adac5
basic: Plugin2ClassLoader.addURL parent called for https://myAppletHost.com/download/myApplet.jar
network: Connecting https://myAppletHost.com/download/myApplet.jar with proxy=HTTP @ user-proxy.com/194.xxx.xx.xx:80
network: Server https://myAppletHost.com/download/myApplet.jar requesting to set-cookie with "BCSI-CS-2d4ce94a2ae7b460=2; Path=/"
network: Connecting http://10.x.x.xx:53/ with proxy=DIRECT
                (##THE ABOVE REQUEST CAUSES THE DELAY OR HANGS##)
network: Server https://myAppletHost.com/download/myApplet.jar requesting to set-cookie with "BCSI-CS-2d4ce94a2ae7b460=2; Path=/"
security: Loading Root CA certificates from C:\Program Files (x86)\Java\jre7\lib\security\cacerts
security: Loaded Root CA certificates from C:\Program Files (x86)\Java\jre7\lib\security\cacerts
security: Loading SSL Root CA certificates from C:\Program Files (x86)\Java\jre7\lib\security\cacerts
security: Loaded SSL Root CA certificates from C:\Program Files (x86)\Java\jre7\lib\security\cacerts
security: Loading certificates from Deployment session certificate store
security: Loaded certificates from Deployment session certificate store
security: Loading certificates from Internet Explorer ROOT certificate store
security: Loaded certificates from Internet Explorer ROOT certificate store
network: Connecting https://myAppletHost.com/download/myApplet.jar with proxy=HTTP @ user-proxy.com/194.xxx.xx.xx:80
network: Server https://myAppletHost.com/download/myApplet.jar requesting to set-cookie with "BCSI-CS-2d4ce94a2ae7b460=2; Path=/"
network: Server https://myAppletHost.com/download/myApplet.jar requesting to set-cookie with "BCSI-CS-2d4ce94a2ae7b460=2; Path=/"
network: Connecting https://myAppletHost.com/download/myApplet.jar with cookie "JSESSIONID=0000UQuXWY5tjxjpwcKHlfJKe_8:175oe9j45; BCSI-CS-2d4ce94a2ae7b460=2"
network: ResponseCode for https://myAppletHost.com/download/myApplet.jar : 200
network: Encoding for https://myAppletHost.com/download/myApplet.jar : null
network: Server response: (length: -1, lastModified: Thu Feb xx yy:yy:yy CET 2013, downloadVersion: null, mimeType: text/plain)
network: Downloading resource: https://myAppletHost.com/download/myApplet.jar
                Content-Length: -1
                Content-Encoding: null
Section C:
Java Plug-in 10.40.2.43
Using JRE version 1.7.0_40-b43 Java HotSpot(TM) Client VM
User home directory = C:\Users\userA
basic: Plugin2ClassLoader.addURL parent called for https://myAppletHost.com/download/myApplet.jar
network: Connecting https://myAppletHost.com/download/myApplet.jar with proxy=HTTP @ user-proxy.com/194.xxx.xx.xx:80
network: Server https://myAppletHost.com/download/myApplet.jar requesting to set-cookie with "BCSI-CS-1d67c8b6508ca09c=2; Path=/"
network: Connecting http://10.x.x.xx:53/ with proxy=DIRECT
                (##THE ABOVE REQUEST CAUSES THE DELAY OR HANGS##)
network: Checking for update at: https://javadl-esd-secure.oracle.com/update/blacklist
network: Checking for update at: https://javadl-esd-secure.oracle.com/update/blacklisted.certs
network: Checking for update at: https://javadl-esd-secure.oracle.com/update/baseline.version
network: Connecting https://javadl-esd-secure.oracle.com/update/blacklist with proxy=HTTP @ user-proxy.com/194.xxx.xx.xx:80
network: Connecting https://javadl-esd-secure.oracle.com/update/baseline.version with proxy=HTTP @ user-proxy.com/194.xxx.xx.xx:80
network: Connecting https://javadl-esd-secure.oracle.com/update/blacklisted.certs with proxy=HTTP @ user-proxy.com/194.xxx.xx.xx:80
security: Loading Root CA certificates from C:\Program Files (x86)\Java\jre7\lib\security\cacerts
security: Loaded Root CA certificates from C:\Program Files (x86)\Java\jre7\lib\security\cacerts
security: Loading SSL Root CA certificates from C:\Program Files (x86)\Java\jre7\lib\security\cacerts
security: Loaded SSL Root CA certificates from C:\Program Files (x86)\Java\jre7\lib\security\cacerts
Dump system properties ...
https.protocols = TLSv1,SSLv3
java.vm.info = mixed mode, sharing
java.vm.name = Java HotSpot(TM) Client VM
java.vm.specification.name = Java Virtual Machine Specification
java.vm.specification.vendor = Oracle Corporation
java.vm.specification.version = 1.7
java.vm.vendor = Oracle Corporation
java.vm.version = 24.0-b56
javaplugin.nodotversion = 10402
javaplugin.version = 10.40.2.43
os.arch = x86
os.name = Windows 7
os.version = 6.1
trustProxy = true
active.deployment.proxy.auto.config.url = http://www.userAppX.com/proxy.pac
active.deployment.proxy.bypass.local = false
active.deployment.proxy.http.host = user-proxy.com
active.deployment.proxy.http.port = 80
active.deployment.proxy.same = false
active.deployment.proxy.type = 3
deployment.browser.path = C:\Program Files (x86)\Internet Explorer\iexplore.exe
deployment.proxy.auto.config.url = http://www.userAppX.com/proxy.pac
deployment.proxy.bypass.local = false
deployment.proxy.http.host = user-proxy.com
deployment.proxy.http.port = 80
deployment.proxy.override.hosts =
deployment.proxy.same = false
deployment.proxy.type = 3
deployment.security.SSLv2Hello = false
deployment.security.SSLv3 = true
deployment.security.TLSv1 = true
deployment.security.TLSv1.1 = false
deployment.security.TLSv1.2 = false
deployment.security.authenticator = true
deployment.security.disable = false
deployment.security.level = HIGH
deployment.security.mixcode = ENABLE
PS:
Since the JRE 1.7.0_25-b17 update, it is noticed that when the Java plugin requests for the applet File; it sends a request to the Domain Controller of the user, which causes a delay of 2 to 5 minutes and sometimes hangs.
The problem occurs consistently, and also with JRE 1.7.0_45-b18.
Java Plug-in 10.45.2.18
Using JRE version 1.7.0_45-b18 Java HotSpot(TM) Client VM
User home directory = C:\Users\userA
c:   clear console window
f:   finalize objects on finalization queue
g:   garbage collect
h:   display this help message
l:   dump classloader list
m:   print memory usage
o:   trigger logging
q:   hide console
r:   reload policy configuration
s:   dump system and deployment properties
t:   dump thread list
v:   dump thread stack
x:   clear classloader cache
0-5: set trace level to <n>
cache: Initialize resource manager: com.sun.deploy.cache.ResourceProviderImpl@134a33d
basic: Added progress listener: sun.plugin.util.ProgressMonitorAdapter@1971f66
basic: Plugin2ClassLoader.addURL parent called for https://myAppletHost.com/download/myApplet.jar
network: Connecting https://myAppletHost.com/download/myApplet.jar with proxy=HTTP @ user-proxy.com/194.xxx.xx.xx:80
network: Server https://myAppletHost.com/download/myApplet.jar requesting to set-cookie with "BCSI-CS-f797d4d262467220=2; Path=/"
network: Connecting http://10.x.x.xx:53/ with proxy=DIRECT
network: Connecting http://10.x.x.xx:53/ with proxy=DIRECT
                (##THE ABOVE REQUEST CAUSES THE DELAY AND SOMETIMES HANGS##)

My organization is experiencing very similar problems. We have resolved it through several steps.
We upgraded the client to Java 8 and we saw in the console that the hanging connection with the Domain Controller no longer occurs. This may be all that is necessary for your environment as well.

Applet File search

Hai
give some solution to find correct path using applet
below give is the applet code ,when i run this using IE ,path found is to be incorrect ,how to solve this problem
import java.io.*;
import java.applet.*;
import java.awt.*;
import javax.swing.*;
/*<applet code ="Appdemo" width=300 height =50>
</applet>
public class Appdemo extends Applet
public void start()
     java.io.File file1=new java.io.File("Screen.java");
     System.out.println(" Path "+file1.getAbsolutePath());
     JOptionPane.showMessageDialog(null,"path1"+file1.getAbsolutePath());
The above is the applet file
when i run this applet by
appletviewer Appdemo.java i am getting the correctpath as (D:\sample\Screen.java)
same thing when i run this applet in InternetEx
i am getting path as
c:\Document and setting\user\Desktop\Screen.java
how to solve this i need to get the same path as D:\sample\Screen.java

Hi
I think in which directory yr screen...... file is present from where
u r running ur applet file
give the absolute path in file constructor
try this

Applet file not found execption.. what to do ?

Hai to all ...
I have a created an japplet within a netbeans project (*NewJApplet*). This applet is used to display a spell checking jframe(*SpellerFrame*) which does all the spell checking part i need. The jframe I mentioned makes use of another class (*mySpellChecker)* which in turn requires an external library jar file (*jazzy-core.jar*). The mySpellChecker class also needs to access a dictionary file english.0 within a dict file which i placed in a folder (*dict*) in the root of the project. In the applet viewer the applet works fine. But when i try to embed the applet in an HTML page problems arise. After 'googling' for quite a bit i managed to solve many of the problems which were primarily related to Applet tag attributes.
I build the project using netbeans. In the dist folder i placed the html file i was talking about and all the external library jars which i explicitly declared in the applet tag.
But now i have a problem . In the browser the html page is displayed but the applet does not load. The applet console says the dict/english.0 file cannot be found
Could anybody help ?
Sorry for making the post too long

[http://java.sun.com/docs/books/tutorial/deployment/applet/data.html] may be of some use.

Applet file writing without permission

Is it possible for an applet to write a text or html document to be displayed in a browser without needing to grant it permissions?

I experimented with writing a file and naming the file to the directory that the applet's in using getCodeBase(), but that didn't work. I've been looking into writing directly to a browser, but that's kind of ugly, and it looks like you have to play with system paths and what-not in order to talk to javascript, so I ruled that out. Any help is appreciated.

Applet file access problem

Hi, I am new to applets and I am trying to build an applet that needs input from other files on the server. How can I give my applet access to these files? I found some code with URLConnection, but I cannot seem to make it work. I am getting AppletNotLoaded appearing on the bottom of the webpage. Here is some of the URLConnection code, if anyone knows of mistakes in it:
URL url;
URLConnection urlConn;
     //DataInputStream     cfile;
     url = new URL(getCodeBase().toString() + "/R2Code/ourcode/data/"+filename+".con");
     urlConn = url.openConnection();
urlConn.setDoInput(true);
urlConn.setUseCaches(false);
BufferedReader cfile = new BufferedReader(new InputStreamReader(urlConn.getInputStream()));
//BufferedReader cfile = new BufferedReader(new FileReader (filename+".con"));
     cfile.readLine();
     StringTokenizer st = new StringTokenizer(cfile.readLine());
I am trying to read in a text file, which has the ending ".con" if that concerned anyone. Any advice would be great, thanks.

Here is the specific error from java console:
load: class ProteinApplet3.class not found.
java.lang.ClassNotFoundException: ProteinApplet3.class
at sun.applet.AppletClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.applet.AppletClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.applet.AppletClassLoader.loadCode(Unknown Source)
at sun.applet.AppletPanel.createApplet(Unknown Source)
at sun.plugin.AppletViewer.createApplet(Unknown Source)
at sun.applet.AppletPanel.runLoader(Unknown Source)
at sun.applet.AppletPanel.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: open HTTP connection failed.
at sun.applet.AppletClassLoader.getBytes(Unknown Source)
at sun.applet.AppletClassLoader.access$100(Unknown Source)
at sun.applet.AppletClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
... 10 more
I am also getting errors saying that certain classes cannot be found, like point3f or anything from vecmath. Is there something to be done to fix this?
It has to be finding the applet, just not loading it because its reading through the list of imports...

Applet file access

I know that unsigned applets loaded into a browser don't have access to the local file system. Is there any way for people to save information from an applet for later use through a save file dialog? It seems like there must be some way to save data without having to get the applet signed.

If you have the file saved on the Web-Server you could redirect the browser to that page so that the browser can download the file and show the Save-dialog.

Applet file access security

Hi, I'm trying to test my applet locally, but it came up with SecurityAccesExceptions when trying to access a required config file. I've been told this is because applets are prevented from accessing files not on a server, for security etc. So I stuck everything onto my local server and gave an absolute path to the file (http://localhost/config.xml). That worked, but I have 2 queries:
1) The config.xml file then refers to another config file, in a field logconfigpath, which is accessed using new file(logconfigpath) in initialisation. Problem is, apparently the file constructer cant create a File from an absolute path like http://localhost/logconfig.xml. It says it cant find it... And if I set the logconfigpath to just be the relative path of the xml (logconfig.xml), it comes up with a security exception again... What to do?
2) How does the applet know if its being run from a server or locally? I stuck everything onto my local server and tried giving xml paths relatively, and it still didnt like it. I still needed to provide its absolute path on my localserver. Does this mean when this is eventually implemented on a proper server, I'd still need to provide the file locations absolutely?
Sorry if these are really basic questions...I'm quite the beginner...
Cheers,
Siam

the important thing is who is running the applet. That 'thing' can install a SecurityManager, which decides what an applet can do. If you run in a browser, like ie, then the applet won't be allowed to access the local file system. If you run the applet in appletviewer, it will.
To get around these problems, just sign your jar. It is a trivial thing to do
First generate a digital signature in a keystore using the keytool command as
keytool -genkey -alias myalias -keystore c:\mykey.store -keypass mypass -storepass mypass2then sign your jar file like
jarsigner -keystore c:\mykey.store -storepass mypass2 -keypass mypass -signedjar c:\temp\mysigned.jar c:\temp\original.jar myalias

Applet:file writing?

this will be a very easy question for all the pros here:
i want to write a file that is on the server and in the same directory as the file!
thanks in advance

yes thats php!Yes it is.
now i tried it with filewriter!but it didnt work!What the f*** is filewriter?
And yes of course it works ('tut')
that can't be soo difficult!the file is on the server!It is with an applet, yes.
or even a servletimport java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class counter2 extends HttpServlet {
     int count;
public void init() throws ServletException {
     FileReader fr = null;
     BufferedReader bfr =null;
     try {
          fr = new FileReader("InitDestroyCounter.initial");
          bfr = new BufferedReader(fr);
          String initial =bfr.readLine();
          count = Integer.parseInt(initial);
          return;
     catch(Exception ignoreAll){}
     finally {
     try {
          if(bfr != null){
          bfr.close();
     catch(Exception ignoreAll){}
     String initial = getInitParameter("initial");
     try {
          count = Integer.parseInt(initial);
          return;
     catch(Exception ignoreAll){}
   count =0;
public void doGet (HttpServletRequest req, HttpServletResponse res)
                                  throws ServletException, IOException {
     res.setContentType("text/html");
     PrintWriter out = res.getWriter();
   count++;
   out.println("Since loading the servlet has been accessed "+count+" times.");
public void destroy(){
     super.destroy();
     saveState();
public void saveState() {
     FileWriter fwr = null;
     PrintWriter pwr =null;
     try {
        fwr = new FileWriter("InitialDestoyCounter.initial");
          pwr = new PrintWriter(fwr);
          pwr.println(count);
          return;
     catch(Exception ignoreAll){}
     finally {
          if(pwr != null) {
          pwr.close();
}php is the IDEAL tool for what youre trying to do
Go get 'em tiger!

Problem with applet file loading

I have a problem with loading files into a java applet. import java.applet.*;
import java.awt.*;
import java.io.*;
import java.util.*;
import java.net.*;
public class main extends Applet {
     private static ArrayList<String> SGM;
     public void init() {
          SGM = new ArrayList<String>();
          String gameDir = getParameter("game_dir");
          try {
               File fHandle = new File(gameDir+"game.sgm");
               Scanner fScanner = new Scanner(fHandle);
               while(fScanner.hasNextLine()) {
                    SGM.add(fScanner.nextLine());
               //System.out.println(SGM.get(0));
          } catch(Exception e) {
               System.out.println("Applet threw error: "+e);
...The problem is with File fHandle = new File(gameDir+"game.sgm"); I tried putting File(gameDir+"/game.sgm"); and appending / to the folder in the <PARAM> tag, but it still changes it to \, which means I can only run it locally, and in Windows. Why is it doing this, and how can I fix it?

This file you were hoping to load: it's on the server, right? Not on the computer where the applet is running in a browser?
(At least that's a common mistake made by people when they write their first applet.)
If that's the case then you can't use a File object to access a file on a different computer. To access a file on the server, first you will have to put the file in a place on the server where it can be downloaded. Then in your applet you need to get a URL for the file. (The getDocumentBase() method can be used to prevent you from having to hard-code the full URL for the file.) Next, "this.getClass().getResourceAsStream(URL)" gets you an InputStream from which you can read the data from the file.

Applet & File Class

Hello Java Fans!
I have an applet that is embedded in an HTML file. The applet is
just a button that launches a Frame Window. Now the Frame window
has a 'File Class' object. If I test it in the appletviewer
everything works fine and I get the:
File length(), path, absolute path etc ... to be displayed in
the 'List Object' Window.
However, if I test it in the IE Browser, the Frame opens fine but
no information is diplayed at all.
Could somebody give me a hint please? Does it have something to do
with File permissions maybe because it's launched from a browser?
Thanks a bunch in advance. A.

Hi,
Applets will always have a problem when they are trying to execute an external program, or a file on the user's machine. A security problem will occur.
Check in the systray down on the right on a Windows machine and pull up the java console. This should show all exceptions that occurr in an applet.
You will probably have to get your applet signed. See help about signing applets, or if you are trying to get the applet off the remote server where your code is stored on, rmi or a client/server program can be used to get your file.

Local Applet Files

Hi all, I'm new, and after this question some of you might think I'm crazy.
Can an applet store image files on visitors local computer? For quicker loading by referencing at future visits (archive data, stored files, whatever it's called).
If so, what is the limit? So far, all together, the images are around 50MB.
If so, would you mind pointing me in the right direction, please?
Thanks a lot in advance, if anyone can help me out here :)

Applets have lots of restrictions in order to ensure the client system security.
One such restriction is that they cannot access the local file system, no read,
no write of any kind.
There are two ways to overcome these restrictions, in which case you would
be allowed to write as much as you want.
1. Re-configure each user's Java installation. This works well in controlled environments, such as an office.
2. Use signed applets. This is the only option when your client can be anyone on WWW.
There are some disadvantages to this approach. The clients will receive a security prompt asking
them if they really want to trust this applet. You will need to incorporate the applet signing procedure,
which may be complicate, depends whom you ask. You will need to purchase a code signing certificate
and renew it periodically. For prices, check Verisign, Thawte, Comodo and quite a few other
companies that are in this market, but to give you an idea, expect something between 100$ and 500$/year.
Edited by: baftos on Oct 29, 2007 2:28 PM

Where browser saved its applet files?

Hi friends,
When applet is loaded into browser, is there any local copy somewhere under browser or its temp directory? I am wondering where the browser saves the applet.jar or *.class files in user's local machine? Or it just loaded into the user's memory, and does not save anywhere?
Thanks.

The applet class file is cached in the user's home directory if you are using Windows. For example I'm using win2k so it gets cached in C:\Documents and Settings\jaind\.jpi_cache\file\1.0\ directory and there are two files XYZApplet.class-680e2d01-7c564852.class and UnzipApplet.class-680e2d01-7c564852.idx. Next time when browser tries to load applet it looks at this version. If the server version is newer than this it again downloads the applet class otherwise uses the cached class.

How to run java file by using another applet file ??

how to compile and run java file by using another applet or japplet file .

how to understand what you are talking about.

Java Applet Files in RH8 Output

Hello to everyone!
My name is Livia, I am from Romania, and I work as a Technical Writer for a company that makes billing software for telecommunications providers. One of my tasks consists in creating WebHelp files for our web-based applications, and I have recently encountered a problem for which I need some expert advice.
While investigating a recent bug (the help isn't working properly on the web application it's for), I have discovered that there are some Java-related files missing from my help output: webhelp.cab, webhelp.jar and whskin_papplet.htm. These files exist in older projects created with RH5. I now use RH8. The Adobe help page for RH 8 (At http://help.adobe.com/en_US/RoboHelp/8.0/RoboHTML/WS5b3ccc516d4fbf351e63e3d11aff59c2a0-7fb 6.html) lists these files as normally present in the output, and yet, in one of the discussion threads on this forum (http://forums.adobe.com/thread/24865), someone says "webhelp.jar is not being used in the output so you can safely remove it if required. It has been fixed in RH8 and doesn't come in the output."
What is the correct version? Should these files appear in the help output or not?
Thank you,
Livia Miron

Welcome to our community
The files should not be present. They are not needed. They are (or were) related to the way the navigation pane works.
In RoboHelp 7 and earlier, there was the following option in the WebHelp generation dialogs:
As you can see, RoboHelp 8 does not offer this option:
Hope this helps... Rick
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