JPDK java applet development

Hi,
I've been trying to develop a java applet application and deploy it on a portal page. I managed to use a HTML portlet to link the java applet through an URL. So far so good. But then I wonder is that a good way for this implementation? Can anyone share their experience.
Furthermore, I'm trying to use the portal SSO for login. Is there any Java api to retrieve the SSO user id, so that I can past it to my Java applet application. I'm very interested for any sample code.
Thanks!

Hi Kevin,
It is possible to develop a JPDK portlet and use it for deploying an applet on the client end. I have developed a simple example of a telnet portlet which is basically an applet which has been embedded into the portlet. The sample is available on Knowledge Exchange. You will need to sign-up for it, if you havent yet.
http://portalstudio.oracle.com/pls/ops/community.comm_folder_download.get_item?p_folderid=538287&p_itemid=569449&p_caid=233
Secondly, if your applet intends on accessing system resources on the client end, then you will have to sign your applet jar file.
You can use the JPDK APIs to retrieve the userID (provided you only need the user id).
PortletRenderRequest pReq = (PortletRenderRequest) request.getAttribute(HttpCommonConstants.PORTLET_RENDER_REQUEST);
pReq.getUser().getName();
Hope that helps,
thanks,
Harsha

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Problem Launching Java Applet with Plug-in: Version 1.4.2_01

Hello out there:
I recently installed j2re-1.4.2_01 on my home computer but have been unable to access Web sites emmploying JAva applets. The following is an email exchange with Jeff Hall of Lowell Observatory, manager of an educational site hosted by Lowell, trying to resolve my problem. The messages are better understood if read in reverse order.
I'm hoping that someone will recognize the source of my problem and can recommmend a solution. I would appreciate any help offered.
Thanks,
Mike Coucke
Hi Jeff:
Well, I guess the problem lies with me somewhere. Here's my answer/status to your questions/suggestions:
1) I'm using MS Windows Me version 4.90.3000
2) I do have the directory C:\Windows\.jpi_cache\jar\, but the only thing in it is an empty folder labeled "1.0". The file LP.jar does not exist anywhere on my hard drive.
3) I tried several game sites that utilized Java applets and got the same results: the Java cup in the upper left corner followed a few seconds later by the red "X". So, evidently the problem is somewhere on my end.
I'm going to post our email exchanges in a Java Users Forum managed by Sun to see if anyone out there can solve my problem. However, if you have any more suggestions, I'll be glad to try them.
Thanks for the help.
Mike Coucke
[email protected]
----- Original Message -----
From: "Jeffrey Hall" <[email protected]>
To: "'Mike Coucke'" <[email protected]>
Sent: Friday, September 05, 2003 1:02 PM
Subject: RE: Registration with Lowell Education Online
Mike,
Rats! What version of Windows are you using? It's a little strange to
see the user directory set to C:\Windows; if you're using XP, I'd expect
it to be something like C:\Documents and Settings\Mike Coucke. In any
event, the output that is of concern is these two lines:
java.lang.ClassNotFoundException: LPRemote.class
Caused by: java.net.UnknownHostException: proxy
It looks like your browser is not finding our server's IP when it comes
time to download the necessary Java code.
LPRemote.class is the fundamental code that runs LOPARC, and your
browser should be downloading it automatically when you click connect.
LPRemote.class is stored along with a bunch of other classes in a file
called "LP.jar" that you download from our server. So, if you go to C:
in Windows Explorer and do a file search for LP.jar, you should find it.
On my machine, it's stored in a directory called ".jpi_cache\jar\" in my
user home directory. Let me know if you have this file, or the
jpi-cache directory.
One other thing you might try is going to a different site that you know
uses Java applets -- I think some of the online game rooms at Yahoo use
Java. See if other sites that use Java load correctly. Then we'll know
if it's our server specifically, or a more general problem on your end.
Jeff Hall
Lowell Observatory
Hello Jeff:
I still have the Java "blues". I followed your instructions, but am still unable to launch a LOPARC session. After an initial failure, I uninstalled all three Java versions I had (1.4.0, 1.4.1, 1.4.2), then reinstalled 1.4.2_01 from the Sun website.
Now, when I try to launch LOPARC, I initially get a blank window with the Java cup in the upper left corner. After about 20 seconds, the cup changes to a red "X". During those 20 seconds, the following appear in the IE message bar at the bottom of the window: "Applet LPRemote notinited" (their spelling) which changes to "Loading Java Applet Failed..." when the red "X" appears.
Following is a copy of the log from my Java Console during all of this:
Java(TM) Plug-in: Version 1.4.2_01
Using JRE version 1.4.2_01 Java HotSpot(TM) Client VM
User home directory = C:\WINDOWS
Proxy Configuration: Manual Configuration
Proxy: http=proxy,https=proxy,ftp=proxy,gopher=proxy
Proxy Overrides:
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
p: reload proxy configuration
q: hide console
r: reload policy configuration
s: dump system properties
t: dump thread list
v: dump thread stack
x: clear classloader cache
0-5: set trace level to <n>
load: class LPRemote.class not found.
java.lang.ClassNotFoundException: LPRemote.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.net.UnknownHostException: proxy
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at sun.net.NetworkClient.doConnect(Unknown Source)
at sun.plugin.net.protocol.http.HttpClient.doConnect(Unknown Source)
at sun.net.www.http.HttpClient.openServer(Unknown Source)
at sun.net.www.http.HttpClient$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.net.www.http.HttpClient.privilegedOpenServer(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.<init>(Unknown Source)
at sun.plugin.net.protocol.http.HttpClient.<init>(Unknown Source)
at sun.plugin.net.protocol.http.HttpClient.New(Unknown Source)
at sun.plugin.net.protocol.http.HttpURLConnection.createConnection(Unknown Source)
at sun.plugin.net.protocol.http.HttpURLConnection.connect(Unknown Source)
at sun.plugin.net.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
at java.net.HttpURLConnection.getResponseCode(Unknown Source)
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 followed this up by executing the following three console commands:
"dump system properties"
"dump classholder list"
"dump thread list"
and obtained the following listings:
Dump system properties ...
acl.read = +
acl.read.default =
acl.write = +
acl.write.default =
application.home = C:\PROGRA~1\JAVA\J2RE14~1.2_0
awt.toolkit = sun.awt.windows.WToolkit
browser = sun.plugin
browser.vendor = Sun Microsystems, Inc.
browser.version = 1.1
deployment.javaws.cache.dir = C:\WINDOWS\.javaws\cache
deployment.javaws.jre.0.enabled = true
deployment.javaws.jre.0.location = http://java.sun.com/products/autodl/j2se
deployment.javaws.jre.0.osarch = x86
deployment.javaws.jre.0.osname = Windows
deployment.javaws.jre.0.path = C:\Program Files\Java\j2re1.4.2_01\bin\javaw.exe
deployment.javaws.jre.0.platform = 1.4
deployment.javaws.jre.0.product = 1.4.2_01
deployment.javaws.jre.0.registered = true
deployment.javaws.version = javaws-1.4.2_01
deployment.system.cacerts = C:\PROGRA~1\JAVA\J2RE14~1.2_0\lib\security\cacerts
deployment.system.home = C:\WINDOWS\Sun\Java\Deployment
deployment.system.jssecacerts = C:\PROGRA~1\JAVA\J2RE14~1.2_0\lib\security\cacerts
deployment.system.profile = C:\WINDOWS
deployment.system.security.policy = file:/C:/WINDOWS/Sun/Java/Deployment/security/java.policy
deployment.user.cachedir = C:\WINDOWS\Application Data\Sun\Java\Deployment\cache
deployment.user.certs = C:\WINDOWS\Application Data\Sun\Java\Deployment\security\deployment.certs
deployment.user.extdir = C:\WINDOWS\Application Data\Sun\Java\Deployment\ext
deployment.user.home = C:\WINDOWS\Application Data\Sun\Java\Deployment
deployment.user.jssecerts = C:\WINDOWS\Application Data\Sun\Java\Deployment\security\deployment.jssecerts
deployment.user.logdir = C:\WINDOWS\Application Data\Sun\Java\Deployment\log
deployment.user.profile = C:\WINDOWS\Application Data
deployment.user.security.policy = file:/C:/WINDOWS/Application%20Data/Sun/Java/Deployment/security/java.policy
deployment.user.tmpdir = C:\WINDOWS\Application Data\Sun\Java\Deployment\cache\tmp
file.encoding = Cp1252
file.encoding.pkg = sun.io
file.separator = \
file.separator.applet = true
http.agent = Mozilla/4.0 (Windows Me 4.90)
http.auth.serializeRequests = true
https.protocols = SSLv3,SSLv2Hello
java.awt.graphicsenv = sun.awt.Win32GraphicsEnvironment
java.awt.printerjob = sun.awt.windows.WPrinterJob
java.class.path = C:\PROGRA~1\JAVA\J2RE14~1.2_0\classes
java.class.version = 48.0
java.class.version.applet = true
java.endorsed.dirs = C:\PROGRAM FILES\JAVA\J2RE1.4.2_01\lib\endorsed
java.ext.dirs = C:\PROGRAM FILES\JAVA\J2RE1.4.2_01\lib\ext
java.home = C:\PROGRA~1\JAVA\J2RE14~1.2_0
java.io.tmpdir = C:\WINDOWS\TEMP\
java.library.path = D:\PROGRAM FILES\INTERNET EXPLORER 6;.;C:\WINDOWS\SYSTEM;C:\WINDOWS;D:\PROGRA~1\INTERN~1;;C:\WINDOWS;C:\WINDOWS\COMMAND
java.protocol.handler.pkgs = sun.plugin.net.protocol|sun.plugin.net.protocol
java.runtime.name = Java(TM) 2 Runtime Environment, Standard Edition
java.runtime.version = 1.4.2_01-b06
java.specification.name = Java Platform API Specification
java.specification.vendor = Sun Microsystems Inc.
java.specification.version = 1.4
java.util.prefs.PreferencesFactory = java.util.prefs.WindowsPreferencesFactory
java.vendor = Sun Microsystems Inc.
java.vendor.applet = true
java.vendor.url = http://java.sun.com/
java.vendor.url.applet = true
java.vendor.url.bug = http://java.sun.com/cgi-bin/bugreport.cgi
java.version = 1.4.2_01
java.version.applet = true
java.vm.info = mixed mode
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 = 1.4.2_01-b06
javaplugin.maxHeapSize = 96m
javaplugin.nodotversion = 142_01
javaplugin.proxy.config.list = http=proxy,https=proxy,ftp=proxy,gopher=proxy
javaplugin.proxy.config.type = manual
javaplugin.version = 1.4.2_01
javaplugin.vm.options = -Djava.class.path=C:\PROGRA~1\JAVA\J2RE14~1.2_0\classes -Xbootclasspath/a:C:\PROGRA~1\JAVA\J2RE14~1.2_0\lib\plugin.jar -Xmx96m -Djavaplugin.maxHeapSize=96m -Xverify:remote -Djavaplugin.version=1.4.2_01 -Djavaplugin.nodotversion=142_01 -Dbrowser=sun.plugin -DtrustProxy=true -Dapplication.home=C:\PROGRA~1\JAVA\J2RE14~1.2_0 -Djava.protocol.handler.pkgs=sun.plugin.net.protocol
line.separator = \r\n
line.separator.applet = true
os.arch = x86
os.arch.applet = true
os.name = Windows Me
os.name.applet = true
os.version = 4.90
os.version.applet = true
package.restrict.access.netscape = false
package.restrict.access.sun = true
package.restrict.definition.java = true
package.restrict.definition.netscape = true
package.restrict.definition.sun = true
path.separator = ;
path.separator.applet = true
sun.arch.data.model = 32
sun.boot.class.path = C:\PROGRAM FILES\JAVA\J2RE1.4.2_01\lib\rt.jar;C:\PROGRAM FILES\JAVA\J2RE1.4.2_01\lib\i18n.jar;C:\PROGRAM FILES\JAVA\J2RE1.4.2_01\lib\sunrsasign.jar;C:\PROGRAM FILES\JAVA\J2RE1.4.2_01\lib\jsse.jar;C:\PROGRAM FILES\JAVA\J2RE1.4.2_01\lib\jce.jar;C:\PROGRAM FILES\JAVA\J2RE1.4.2_01\lib\charsets.jar;C:\PROGRAM FILES\JAVA\J2RE1.4.2_01\classes;C:\PROGRA~1\JAVA\J2RE14~1.2_0\lib\plugin.jar
sun.boot.library.path = C:\PROGRAM FILES\JAVA\J2RE1.4.2_01\bin
sun.cpu.endian = little
sun.cpu.isalist = pentium i486 i386
sun.io.unicode.encoding = UnicodeLittle
sun.java2d.fontpath =
sun.net.client.defaultConnectTimeout = 120000
sun.os.patch.level =
trustProxy = true
user.country = US
user.dir = C:\WINDOWS\Desktop
user.home = C:\WINDOWS
user.language = en
user.name = Michael G. Coucke
user.timezone =
user.variant =
Done.
Dump classloader list ...
codebase=http://kraken.lowell.edu/, key=http://kraken.lowell.edu/,IONJava/classes/ion_16.jar,IONJava/classes/LP.jar, zombie=false, cache=true, refcount=1, info=sun.plugin.ClassLoaderInfo@109de5b
Done.
Dump thread list ...
Group main,ac=11,agc=2,pri=10
main,5,alive
AWT-Windows,6,alive,dameon
AWT-Shutdown,5,alive
Java2D Disposer,10,alive,dameon
AWT-EventQueue-0,6,alive
Group Plugin Thread Group,ac=3,agc=0,pri=10
Main Console Writer,6,alive
AWT-EventQueue-1,6,alive
TimerQueue,5,alive,dameon
Group http://kraken.lowell.edu/-threadGroup,ac=2,agc=0,pri=4
thread applet-LPRemote.class,4,alive
AWT-EventQueue-2,4,alive
Done.
I'm not a Java expert, so this may be more information than you ever wanted to see.
Once again, I hope that you can help. My experience has been that I usually have some obscure option set incorrectly and that causes me great grief.
Thanks fo your help,
Mike Coucke
[email protected]
----- Original Message -----
From: "Jeffrey Hall" <[email protected]>
To: "'Mike Coucke'" <[email protected]>
Sent: Thursday, September 04, 2003 11:48 AM
Subject: RE: Registration with Lowell Education Online
Hi Mike,
Try it now. I think this problem has arisen because Sun just
released a new version of the Plug-in (1.4.2), and when we released the
public beta of LOPARC, only one relevant version (1.4.0) was available
and the LOPARC code was written to look for that by default. I have
just recoded the relevant routines so they should now cause your browser
to simply pick up the latest 1.4 version of the Plug-in you have
installed, whatever it is. I "broke" Java on my machine to replicate
your problem, and the code I inserted today did fix it. Hopefully it
will have the same effect for you. I am running IE 6 and plugin
1.4.2_01 (as accessed via Tools->Sun Java Console).
One broader problem: some (non-LOPARC-specific) users on the Sun
forums have reported the "JRE collision" you are seeing when multiple
versions of the Plug-in are installed on the same machine. So if the
fix I made to our code doesn't work, one option would be to uninstall
all Java components from your computer and do a fresh install of the
latest runtime environment.
Let me know how/if this works. Thanks for the feedback and for your
patience.
Best regards,
Jeff Hall
Lowell Observatory
-----Original Message-----
From: Mike Coucke [mailto:[email protected]]
Sent: Wednesday, September 03, 2003 6:30 PM
To: [email protected]
Subject: Re: Registration with Lowell Education Online
Hello Jeff:
So far, I have been unable to launch a LOPARC session. I repeatedly
get the following error message:
"Exception: java.lang.ClassNotFoundException: LPRemote.class"
My browser is MS Internet Explorer version 6.0.2800.1106 Initially I was
using Java Plug-In version 1.4.1 and received the error message. I went
to the Sun website and downloaded/installed Java Plug-In version 1.4.2
and still get the message.
Before I try to launch LOPARC, I can select Tools->Sun Java Console from
IE's pull down menu to check my Java Plug-In version. When I try to
launch LOPARC, I get the following message:
"Applet(s) in this HTML page requires a version of Java different from
the one the browser is currently using. In order to run the applet(s)
in this HTML page, a new browser session is required, press 'Yes' to
start a new browser session." If I select 'No', I get the following
message: "Java Plug-in detected JRE collission"
If I select 'Yes', a new browser window opens and then I get the first
message above.
Can you help?
Mike Coucke
[email protected]
----- Original Message -----
From: <[email protected]>
To: <[email protected]>
Sent: Monday, September 01, 2003 5:30 PM
Subject: Registration with Lowell Education Online
September 1, 2003
Dear Michael Coucke:
Thank you for registering with Lowell Observatory's online education
site. We hope you enjoy using it and visit regularly as we continue to
expand its features and capabilities. This is a one-time welcoming
email.
For your records, your user ID is xxxxx, and your password is #########.
You'll need to supply these each time you log in.
This site gives you access to research-grade equipment including a 16"
telescope, CCD detector, and image processing software. Our online
archive of data is now available 24/7. The telescope will be opening to
our onsite users in May, and on select nights to the Internet at large
in June.
We have designed this site so you don't need a huge monitor or a
supercomputer to use it. All pages are viewable on screens running at
800x600 resolution or higher. To use LOPARC, you'll need a Java-enabled
browser with the Java 1.4 plug-in installed. If you don't have the
plug-in, you'll be prompted to download it the first time you attempt to
connect. This is an admittedly large (9 MB) but one-time-only download.
This site works correctly under Internet Explorer version 5 or higher.
If you use Netscape, you must be running version 6 or higher, and
display or applet behavior anomalies may occur.
If at any time you can't connect to our server, simply try again later.
We do experience several power outages each year, particularly during
Flagstaff's summer thunderstorm season. Our server is fully protected
and backed up, and can be quickly brought back on line, but any active
user sessions will be lost. Thanks for your patience during these
inevitable downtimes.
Your questions, comments, suggestions, and bug reports about this site
are always welcome. On behalf of the LOPARC development team, thanks
for signing up!
Jeffrey Hall
Assistant Research Scientist
Associate Director, Education and Special Programs
Lowell Observatory
Flagstaff, Arizona

Hi Mike,
I see this in your logs:
Java(TM) Plug-in: Version 1.4.2_01
Using JRE version 1.4.2_01 Java HotSpot(TM) Client VM
User home directory = C:\WINDOWS
Proxy Configuration: Manual Configuration
Proxy: http=proxy,https=proxy,ftp=proxy,gopher=proxy
Proxy Overrides:
I just helped my Dad set up his computer with a new
cable modem, and had the situation where we couldn't
access any secure Web sites. The cable folks had us
disable the proxy. It looks like the error message is
saying it can't find your proxy server, and the logs
you posted say that you've decided to configure your
proxy manually, rather than using the settings from
IE (which is how mine is set up in the plugin
control panel.)
Could that be the problem?
--Steve

I am trying to use an education program that needs Java applets to install and use and it will not use Safari. When I download IE from the web it will not install. How can I get a browser that will work on my MacAir for travel use of this program?

I am trying to use and education program that needs Java applets and it will not run on Safari. IE will not install from the web. How do I get a browser that will work to install so I can use this program when I travel.

Try using FireFox. IE will only run on a Mac if you run Windows on the Mac.
Windows on Intel Macs
There are presently several alternatives for running Windows on Intel Macs.
Install the Apple Boot Camp software. Purchase Windows 7 or Windows 8. Follow instructions in the Boot Camp documentation on installation of Boot Camp, creating Driver CD, and installing Windows. Boot Camp enables you to boot the computer into OS X or Windows.
Parallels Desktop for Mac and Windows XP, Vista Business, Vista Ultimate, or Windows 7. Parallels is software virtualization that enables running Windows concurrently with OS X.
VM Fusion and Windows XP, Vista Business, Vista Ultimate, or Windows 7. VM Fusion is software virtualization that enables running Windows concurrently with OS X.
CrossOver which enables running many Windows applications without having to install Windows. The Windows applications can run concurrently with OS X.
VirtualBox is a new Open Source freeware virtual machine such as VM Fusion and Parallels that was developed by Solaris. It is not as fully developed for the Mac as Parallels and VM Fusion.
Note that Parallels and VM Fusion can also run other operating systems such as Linux, Unix, OS/2, Solaris, etc. There are performance differences between dual-boot systems and virtualization. The latter tend to be a little slower (not much) and do not provide the video performance of the dual-boot system. See MacTech.com's Virtualization Benchmarking for comparisons of Boot Camp, Parallels, and VM Fusion. A more recent comparison of Parallels, VM Fusion, and Virtual Box is found at Virtualization Benchmarks- Parallels 10 vs. Fusion 7 vs. VirtualBox. Boot Camp is only available with Leopard and later. Except for Crossover and a couple of similar alternatives like DarWine you must have a valid installer disc for Windows.
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How to activate Java Applets?

Hi,
I got some Java Applets that i try to run (again). Since Javas own security and firefox itself forbids to run Java without being activated by the user i thought i would be asked whether to activate java on my own site (local on the PC) or not. Although java is activated inside in the plugins-option menu and the correct installation of java is confirmed by java.com (test after the installation) my Java applets dont show up, not even a message saying "Applets are being blocked" or so.
In chrome i can simply activate the NPAPI in the settings and enable the flag and the applets work. Isnt there a function similar to this?
I would like to run Firefox portable on a CD to give to students. As the Java applets are being blocked i hoped to simply enable the corrosponding flag so prevent rewriting all the java applets.
Is there another developer plugin of some sort that i can pre-install into Firefox portable that does the job?
See blow for Versions of Windows, Firefox. Java Version 8 Update 45 (Build 1.8.0_45-b14) latest version.
Kind regards,
Marcel Klinge
"application": {
"name": "Firefox",
"version": "37.0.2",
"buildID": "20150415140819",
"userAgent": "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:37.0) Gecko/20100101 Firefox/37.0",
"updateChannel": "release",
"supportURL": "https://support.mozilla.org/1/firefox/37.0.2/WINNT/de/",
"numTotalWindows": 1,
"numRemoteWindows": 0
"crashes": {
"submitted": [],
"pending": 0
"modifiedPreferences": {
"accessibility.typeaheadfind.flashBar": 0,
"browser.cache.disk.smart_size.first_run": false,
"browser.cache.disk.smart_size.enabled": false,
"browser.cache.disk.capacity": 0,
"browser.cache.frecency_experiment": 4,
"browser.places.importBookmarksHTML": false,
"browser.places.smartBookmarksVersion": 7,
"browser.search.useDBForOrder": true,
"browser.sessionstore.upgradeBackup.latestBuildID": "20150415140819",
"browser.startup.homepage_override.mstone": "37.0.2",
"browser.startup.homepage": "file:///C:/Users/Klinge/Desktop/Sign%C3%BC%20I+II%20-%20Neu/sueb1/html/index.html",
"browser.startup.homepage_override.buildID": "20150415140819",
"dom.ipc.plugins.sandbox.default": true,
"dom.mozApps.used": true,
"extensions.lastAppVersion": "37.0.2",
"gfx.direct3d.last_used_feature_level_idx": 0,
"media.gmp-gmpopenh264.lastUpdate": 1430384919,
"media.gmp-gmpopenh264.version": "1.3",
"media.gmp-manager.lastCheck": 1430384919,
"network.cookie.prefsMigrated": true,
"places.database.lastMaintenance": 1430385666,
"places.history.expiration.transient_current_max_pages": 104858,
"plugin.importedState": true,
"plugin.disable_full_page_plugin_for_types": "application/pdf",
"plugin.state.java": 2,
"privacy.sanitize.migrateFx3Prefs": true,
"storage.vacuum.last.places.sqlite": 1430385666,
"storage.vacuum.last.index": 0
"lockedPreferences": {},
"graphics": {
"numTotalWindows": 1,
"numAcceleratedWindows": 1,
"windowLayerManagerType": "Direct3D 11",
"windowLayerManagerRemote": true,
"adapterDescription": "ATI Radeon HD 4650",
"adapterVendorID": "0x1002",
"adapterDeviceID": "0x9498",
"adapterSubsysID": "22691787",
"adapterRAM": "512",
"adapterDrivers": "atiumd64 atidxx64 atiumdag atidxx32 atiumdva atiumd6a atitmm64",
"driverVersion": "8.632.1.2000",
"driverDate": "8-17-2009",
"adapterDescription2": "",
"adapterVendorID2": "",
"adapterDeviceID2": "",
"adapterSubsysID2": "",
"adapterRAM2": "",
"adapterDrivers2": "",
"driverVersion2": "",
"driverDate2": "",
"isGPU2Active": false,
"direct2DEnabled": true,
"directWriteEnabled": true,
"directWriteVersion": "6.2.9200.16571",
"webglRenderer": "Google Inc. -- ANGLE (ATI Radeon HD 4650 Direct3D11 vs_4_1 ps_4_1)",
"info": {
"AzureCanvasBackend": "direct2d 1.1",
"AzureSkiaAccelerated": 0,
"AzureFallbackCanvasBackend": "cairo",
"AzureContentBackend": "direct2d 1.1"
"javaScript": {
"incrementalGCEnabled": true
"accessibility": {
"isActive": false,
"forceDisabled": 0
"libraryVersions": {
"NSPR": {
"minVersion": "4.10.8",
"version": "4.10.8"
"NSS": {
"minVersion": "3.17.4 Basic ECC",
"version": "3.17.4 Basic ECC"
"NSSUTIL": {
"minVersion": "3.17.4",
"version": "3.17.4"
"NSSSSL": {
"minVersion": "3.17.4 Basic ECC",
"version": "3.17.4 Basic ECC"
"NSSSMIME": {
"minVersion": "3.17.4 Basic ECC",
"version": "3.17.4 Basic ECC"
"userJS": {
"exists": false
"extensions": [],
"experiments": []
}

use Robot Class
java.awt.Robot since jdk1.3

Java applets won't load, have latest version of java installed, have removed all old versions from the hard drive, java console not working in firefox, any suggestions please ?

java applets will not load,
i have run the java test page & i have the latest version installed.
have removed all old versions of java from my hard drive & restarted the computer.
i have checked that java is enabled in the plug-ins and it is with version se 6 u22, also something called java development toolkit 6.0.220.4 np runtime script plug-in library for java (tm) deploy.
if i click on java console in tolls nothing happens

Hi,
You might want to look in your control panel for 'Java' icon. It should give you an option to enable java plugin into your browser. Let me know if you still face the issue.
Thanks!

How to update content of a file on server using a Java Applet?

Hi,
I'm new to Java, and I have a task now to overwrite a text file on a server using an applet. I have written a piece of code which compiles but doesn't work. Can you please take a look at the code or give me another way to do it?
Thanks.
Code:
import java.applet.Applet;
import java.io.*;
import java.net.*;
public class test2 extends Applet{
public void init() {
StringBuffer buf = new StringBuffer();
try {
     String output = "this is some string";
     URL aUrl = new URL (getCodeBase().toString() + "test.txt");
     System.out.println(aUrl);
     URLConnection con = aUrl.openConnection();
     con.setDoOutput(true);
     PrintWriter out = new PrintWriter( new BufferedWriter( new OutputStreamWriter(con.getOutputStream())));
     out.println(output);
     out.close();
catch (MalformedURLException mue) {
     System.out.println("improper url");
     mue.printStackTrace();
catch (IOException e) {
     System.out.println("io exception");
     e.printStackTrace();
}

Ram.ViSolve wrote:
869975 wrote:
Thanks. I knew there would be a security issue, but I do not have sufficient knowledge to get around it. If you have a reference how to configure a server please post it here.You need to create Signed Applet. Because normally applets have some restriction to access the files in the client machine. Signed applets overrides the restriction.
To know more, Read [url http://192.9.162.55/developer/onlineTraining/Programming/JDCBook/signed.html]Signed Applet
No. Our OP wants to write to the server, not to the client! And to achieve this from an applet, you don't need it signed, iff the server is the machine from where the applet was downloaded in the first place. You only need to use a mechanism that allows you to write to servers, which HTTP is not. FTP, on the other hand, if setup properly can do it. So instead of trying to write using an HttpURLConnection (OP's attempt), you would use an FTP client library. FTP here is just an example and probably not the best way. Another option is to use some servlet or PHP or ASP on the server side and the applet will sumbmit the changes to that code on the server, which in turn will write to the file. The idea is that you need some 'partner code' on the server, be it the FTP server or the servlet/PHP/ASP code. None of this requires the applet to be signed.

Java Applet Window

I'm not a developer,and this is probably the wrong place to post this. It's really a small, silly thing....but I play Literati on Yahoo, and all of a sudden, across the bottom of my screen blocking the chat screen is a bar that says Java Applet Window.....how do I get rid of this???

See my posting on the JDev Forum :-)

Clickable/Linked Text in Java Applet

Hi,
I have always liked this tool http://link-verify.sourceforge.net/index.en.html and have always wanted to modify it to make the "referer" clickable so that I could easily click to link to the page that had the broken link more easily.
The source code is available and well with the hard economic times I have time to finally modify this to work how I would like.
Can anyone tell me how I would go about accomplishing this? I am a seasoned ASP.NET programmer and understand the overall logic, etc... It is just the Java syntax that I am missing.
Basically I can discern that in source code, LinkFrame.java to be exact on line 308 the "referreeP" panel is being populated with a refL=new List(), where refL is a List that is populated as each link is processed as the applet runs.
How can I make each of those items in the refL list clickable is my primary question for you all. Do I have to use some sort of listener on each item in the list, is that even the right approach to take.
Any and all thoughts appreciated!
PS - I want to shout out to Ralf Wiebicke for creating this wonderful tool, it has been a wonderful developer tool for me over the years.

>
Basically I can discern that in source code, LinkFrame.java to be exact on line 308 the "referreeP" panel is being populated with a refL=new List(), where refL is a List that is populated as each link is processed as the applet runs.
How can I make each of those items in the refL list clickable is my primary question for you all. >Questions usually end with a question mark. Where is yours?
If you check the JavaDocs for List, you will notice it has methods [addActionListener(ActionListener|http://java.sun.com/javase/6/docs/api/java/awt/List.html#addActionListener(java.awt.event.ActionListener)] ) and [addItemListener(ItemListener)|http://java.sun.com/javase/6/docs/api/java/awt/List.html#addItemListener(java.awt.event.ItemListener)]. Either of those listeners will detect actions/selections on the List.
As for showing the links, look to [AppletContext.showDocument(URL)|http://java.sun.com/javase/6/docs/api/java/applet/AppletContext.html#showDocument(java.net.URL)].
As an aside, the AWT widgets such as List are very old-hat. If you wanted to take on a bigger upgrade, you might convert the app. to use Swing.

Java Applet IIOP Call-In with Release 3C--How do we speed updownload ti

We have successfully implemented a simple Java Applet that calls into
Forte Services via IIOP. However, the duration of the download time for
Applet and its required class files is UNACCEPTABLE in a typical
INTERNET environment where 28.8K modems and multiple hops around the net
are not uncommon. We dialed into our network at 28.8K (but no hopping),
and found that download times varied from 1.5 - 2.0 minutes. This is
unacceptable, even by internet standards. We have been using the
Visigenic Visibroker product as the ORB.
After doing some investigation, we've come up with several ideas to
speed up download time:
1. Figure out how to use the Visigenic components (CORBA/IIOP class
files) that come bundled with the latest version of the Netscape
Navigator browser, so that they don't have to be downloaded
2. Figure out how to use ZIP files. Here's what I've read: "Since the
introduction of Netscape Navigator 3.0, you can specify an uncompressed
.zip file as an addition to the code base of your application. By
specifying a ZIP file, the browser will load your applet's classes from
a specified ZIP file before it searches the code base. This ZIP can
improve applet download time by reducing the number of HTTP connections
required to fetch applet code. As an added benefit, Netscape caches the
single ZIP file so that it will not reload your applet unless the date
of the ZIP file has changed."
3. Figure out how to use JAR files. Here's what I've read: "JAR
stands for Java archive. It's a file format based on the popular ZIP
file format and is used for aggregating many files into one. Although
JAR can be used as a general archiving tool, the primary motivation for
its development was so that Java applets and their requisite components
can be downloaded to a browser in a single HTTP transaction, rather than
opening a new connection for each piece. This greatly improves the
speed with which an applet can be loaded onto a web page and begin
functioning. The JAR format also supports compression, which reduces the
size of the file and improves download time still further."
Unfortunately, we've been unable to get any of these approaches to work.
Has any one used these or other approaches to speed up applet download
time? Or, does anyone know of consulting firms that specialize in this
sort of thing?
Thanks in advance for your help.
Mike Nelson, Project Leader
Metrix, Inc.
[email protected]
414-798-8560 x1157

We have successfully implemented a simple Java Applet that calls into
Forte Services via IIOP. However, the duration of the download time for
Applet and its required class files is UNACCEPTABLE in a typical
INTERNET environment where 28.8K modems and multiple hops around the net
are not uncommon. We dialed into our network at 28.8K (but no hopping),
and found that download times varied from 1.5 - 2.0 minutes. This is
unacceptable, even by internet standards. We have been using the
Visigenic Visibroker product as the ORB.
After doing some investigation, we've come up with several ideas to
speed up download time:
1. Figure out how to use the Visigenic components (CORBA/IIOP class
files) that come bundled with the latest version of the Netscape
Navigator browser, so that they don't have to be downloaded
2. Figure out how to use ZIP files. Here's what I've read: "Since the
introduction of Netscape Navigator 3.0, you can specify an uncompressed
.zip file as an addition to the code base of your application. By
specifying a ZIP file, the browser will load your applet's classes from
a specified ZIP file before it searches the code base. This ZIP can
improve applet download time by reducing the number of HTTP connections
required to fetch applet code. As an added benefit, Netscape caches the
single ZIP file so that it will not reload your applet unless the date
of the ZIP file has changed."
3. Figure out how to use JAR files. Here's what I've read: "JAR
stands for Java archive. It's a file format based on the popular ZIP
file format and is used for aggregating many files into one. Although
JAR can be used as a general archiving tool, the primary motivation for
its development was so that Java applets and their requisite components
can be downloaded to a browser in a single HTTP transaction, rather than
opening a new connection for each piece. This greatly improves the
speed with which an applet can be loaded onto a web page and begin
functioning. The JAR format also supports compression, which reduces the
size of the file and improves download time still further."
Unfortunately, we've been unable to get any of these approaches to work.
Has any one used these or other approaches to speed up applet download
time? Or, does anyone know of consulting firms that specialize in this
sort of thing?
Thanks in advance for your help.
Mike Nelson, Project Leader
Metrix, Inc.
[email protected]
414-798-8560 x1157

How to Use DLL Function in Java Applet

Hi all,
I have been assigned a task to develop java applet. The problem is, I need to use DLL functions in my applet to read records. Could you pls anyone guide me how to interface DLL and applet to read records with sample code?
I'm using JDK 1.5.0_06 and Windows XP OS. thanx..
best rgds,
jpdbay

You will need to use Java Native Interface JNI. Ther are many posts on the subject, please search, and this is the documentation:
http://java.sun.com/j2se/1.5.0/docs/guide/jni/spec/jniTOC.html

"Class Formatting Error" in a java applet? (Solved)

(This problem is completely my fault and it would be hard to provide enough information to request and answer. Disregard this message.)
I've been developing a java applet to go on my website, but when running it tosses a "java.lang.ClassFormatError: rendering/ImageObserverClass" to the console. When I looked into the code I thought of java compliance levels. (Earlier I had to set Eclipse to a higher compliance level to make it accept new ArrayList<Renderable>();)
Is this not my problem? In my html code I have the following:
<applet
code="main/GalacticConflict.class"
codebase="code/"
width="640" height="480">
</applet>In Eclipse the program compiles and runs fine, so it most likely is a deeper issue. Thanks for any help!
EDIT:
Heh, that was stupid of me.... Just decided to try removing the <Renderable> from there, but it still doesn't work. The line number the console refers to is commented code, making it even more strange. If you have insight, feel free to post it here, but I'm going to make sure my new code is even being passed to my server properly.
Edited by: Durnus on Dec 26, 2008 9:45 AM
EDIT2:
It appears to be an error with my copying process -- when I view the .html file with Firefox in the workspace folder, it works fine. Sorry for the trouble.
Edited by: Durnus on Dec 26, 2008 9:54 AM

Hi,
Refer the URL :http://help.sap.com/javadocs/pi/SP3/xpi/com/sap/aii/mapping/api/AbstractTransformation.html
regards,
ganga

JPDK java applet development

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