Override the launch of Java Web Start

How can we stop the auto launch of Java web start and prompt the user to enter the desired location to download the jars.
And then launch the jars from that location.
Is there any solution for this.
Please help me in this regard
Nandita

The whole idea of WebStart is to relieve the user of the burden of downloading binaries themselves. The whole point is, they just click a link on a web page, some magic happens, and their app starts up.
Your idea is a complete waste of time.

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How to add scroll function in the applet launched by Java Web Start?

I have Java Web Start installed in order for the applet to launch.The applet size: width:700 height:1000
my compuer resolution:800*600
the applet launched by Java Web Start can only be seen partly,especially height.How to add scroll function in the applet launched by Java Web Start?
Thanks for help.
email:[email protected]

You can very easily add a JScrollPane manually between the Applet and your content. Perhaps it would be beter if javaws did this automatically. In the browser, an applet can be any size. In Java Web Start an applet is directly contained within a JFrame, so it cannot be smaller than the minimum size of a JFrame, or Larger than the max.

Launched thru Java web Start...?

Is there a way to find out whether my application is launched through Java Web Start or as a stand-alone application?
I have think of 2 round about ways -
- Getting the service names using javax.jnlp.ServiceManager.getServiceNames(), which returns null if launched as a standalone application.
- Getting the classloader name.
But, I am looking for one more concrete way of doing it, if any?

Akhil,
I was looking for a solution for this very problem and came across a FAQ in another thread that was helpful. See http://vamphq.com/jwsfaq.html and more specifically http://vamphq.com/jwsfaq.html#under

Can we change the title of "Java Web Start" window?

Hi while running our application into "Java Web Start" using jnlp configuration file, may I know how to change the title of Java Web Start Window.
At present it show the title like "Java Web Start" I want to customize, is it possible? , How?

As far as I know this is not possible. You can customize the splash window displayed with the jnlp how your told, but the title of the window cannot be changed.
Edited by: Phlipp_Meier on Oct 5, 2007 6:14 AM

Can we change the label of Java Web start at the time of downloading applic

can we change the label of Java Web start at the time of downloading application?
At the time of downloading application(jar files) java web start shows "Downloading Application" lable on it window , so can we change it so some other..

The 'splash' screen might be of interest to you.
Here is the quick description from the FAQ.
<http://java.sun.com/j2se/1.5.0/docs/guide/javaws/developersguide/faq.html#206>
Section 3.5 of the JNLP Spec. has more details on using a splash screen for an application.
(But if you mean changing the very first screen seen when downloading an application the first time, the answer is 'no'.)
Late addendum..
By the way - now I review your question, I note you stress 'while jars are downloading'.
There is another strategy you might take. Mark most of the application jar's as 'lazy' download, get the main GUI on-screen quickly, then use the JNLP API's DownloadService to fetch the rest of the jars, after the application is running.
This has the advantage that, then we can have complete control of whatever is shown on the screen during the bulk of the downloads. We might show ..a 'splash screen', or a dialog with the application name on it, or a progress dialog, ..or any combination of the three.
Edited by: AndrewThompson64 on Oct 22, 2007 3:01 PM

Refresh an open web page on closing an applet launch from Java Web Start

Hi
I launch an aplication via Java Web Start from a link in a web page. I am looking to a solution to refresh my web page when I close my applet.
Thanks in advance to give me the solution or only to let me know if it's possible or not.

everything's possible. but this is not trivial. there is no direct connection between the html page that launched the app and the app. You can create an indirect connection by having the app notify a server process when it closes and having the page periodically polling the server for the app's status.

The cache about Java Web Start

can anybody tell me about the meaning of the jws cache structure?
i want to konw the meaning of
P8080
DMJNLPExamples
DMapp
DMlib
RTjbossall-client.jar
RCjbossall-client.jar
RMjbossall-client.jar
what is meaning of the prefix of this directory and file?
thanks in advance!
Gordon

Warning - the cache structure is internal to Java Web Start and subjuct to change between versions of javaws.
In fact Sun has plans that would merge the webstart and plugin cache in 1.6.0, completely changing the structure.
That being said, in the current format, the prefix chars are as follows (from the source bundle of 1.4.2):
first leter is a Type, second leter is an Attribute:
Types:
public final static char DIRECTORY_TYPE = 'D'; // Used internally
public final static char TEMP_TYPE = 'X'; // Used internally
public final static char VERSION_TYPE = 'V'; // Used internally
public final static char INDIRECT_TYPE = 'I'; // Used internally
public final static char RESOURCE_TYPE = 'R'; // JAR/CLASS/IMAGE
public final static char APPLICATION_TYPE = 'A'; // Application-Desc
public final static char EXTENSION_TYPE = 'E'; // Extension-Desc
public final static char MUFFIN_TYPE = 'P'; // Muffins!
Attributes:
public final static char MAIN_FILE_TAG = 'M'; // The main resource (Jar, image or muffin)
public final static char NATIVELIB_FILE_TAG = 'N'; // A directory where a native lib jar gets expanded into
public final static char TIMESTAMP_FILE_TAG = 'T'; // The timestamp file
public final static char CERTIFICATE_FILE_TAG = 'C'; // A certificate stored with the resource
public final static char LAP_FILE_TAG = 'L'; // LocalApplicationProperties
public final static char MAPPED_IMAGE_FILE_TAG = 'B'; // Translated images (such as bmp)
public final static char MUFFIN_ATTR_FILE_TAG = 'U'; // running out of letters - U is for mUffin
/Dietz

Error while launching of the application thru java web start

I have java webstart 1.2. While opening one of the application, its showing me following error message,
"javaws.exe has generated error and will be closed by Windows. You will need to restart the program. An error log is being created."
After that application works fine(It does not close the application) and no log file is generated.
Can any one tell me what is the cause of this problem.
Regards,
Pravanjana

You shouldn't give up without studying the source of JMF.
JMFSecurityManager blocks opening the webcam when it recognizes that the application is executed as an applet. JMF - in fact JMFSecurityManager - cannot distinguish between an applet and a java webstart application because it only evaluates System.getSecurityManager().
If the application is deployed via webstart the System.SecutityManager is NOT null and so JMFSecurityManager makes problems.
So the easiest solution of this problem is to call System.setSecurityManager(null) before any static function of JMF is executed or any class of the Framework is instanciated - e.g in the main-function. Java webstart allows to execute the command if the .jnlp-file requests all-permissions.
Another possibility is to read the properties. Therefore jmutil.dll has to be deployed and in C:\WINDOWS\java\.jmfdir the first line must contain the path of jmf.properties. This should be an alternative but I haven't checked if it works.

Application does not show up in the manager console -- Java Web Start

Hi...
I have downloaded the jnlp file so many times but still the aplcation is not displayed in the JWS manager console.
This my jnlp file : -
<?xml version="1.0" encoding="UTF-8"?>
<jnlp spec="1.0+" codebase="http://2m6:8100/jws/" href="ChatApplication.jnlp">
<information>
<title>Chat Trial</title>
<vendor>SAI</vendor>
<description>Just an example</description>
<icon href="images/icon.gif"/>
</information>
<security>
<all-permissions />
</security>
<resources>
<j2se version="1.3"/>
<jar href="chatapplication.jar"/>
</resources>
<application-desc main-class="ChatImpl"/>
</jnlp>
Can anyone give me any suggestions???? They are welcome.
-Sid

Actually this problem usually occurs as a result of the way you have configured your href line for the jnlp file. If you are still having some problems try putting in:
href="http://2m6:8100/jws/ChatApplication.jnlp"
See if that helps it at all. It's possible that it's not using the relative reference combined with the codebase URL given.

Java console doesn't launch when starting Java Web Start app from Firefox

Updated my Linux desktop from RHEL to Fedora 12 with resultant upgrade of Firefox to 3.5.9 and now when I launch our Java Web Start application, no Java console appears. The Java Control Panel still shows "Show Console" as set. My app uses Java 1.5 which I have installed on my desktop.
What do I do to properly configure my browser/desktop to support use of the Java console?
Please help, I need to debug our app!
Ilane

IlaneMarie wrote:
..Please help, I need to debug our app!Cannot tell you the answer to your FF hassles (because I have no idea why you're seeing that behaviour(1)), but note that you might be able side-step FF by launching a JWS app. using the javaws tool directly from the command line or an Ant build file.
1) Though you might try rebooting the machine if any installation/configuration changes have occurred since last boot.
Also note that many problems with JWS apps. can be sorted be checking the JNLP using JaNeLA.

Java Web Start and the Mac OS

I am new to the Mac OS and to Java Web Start. Using Java Web Start to launch a Java application on the Mac is discussed in several of the posts here. However, in the requirement section of the Overview for Java Web Start says
"Requirements
Desktop/Client requirements:
The client machine requires support for the Java Runtime Environment (JRE), version 1.3 or later. Java Web Start is available for Windows 98/NT/2000/ME/XP, the Solaris Operating Environment, and Linux."
As you can see, Mac OS is not mentioned. Yet Java Web Start exists on my Mac. Am I looking at the wrong documentation? The document is located at
http://java.sun.com/javase/6/docs/technotes/guides/javaws/developersguide/overview.html#jws
I don't know how to use Java Web Start . I don't even know where to look for help. If anyone would care to offer some help it would be greatly appreciated.

You are looking in the right place alright. The reason OSX is not mentioned in the document (or, by extend, any of the official sun documents) is that sun does not (may not?) provide an official java release on OSX. Java on OSX is implemented by Apple (and much to the dismay of both users and developers, they are not doing a very good job). Still, Apple's java usually fulfills the same specifications as the official sun java, so you can take any one of sun's documents on webstart or any other technology and it will usually work on the Mac. You just can't expect sun to assure that a technology will work on a platform they have no control over...

Launching an applet with java web start

Is there a way to launch an applet with java web start? That is, to have the java appelt run in a browser but get deployed with a jnlp-file and have all the benefits of java web start?
Robert

http://www.physci.org/jws/#jtest

Unable to launch java web start

We have already devloped an application based on java web start. Most of the client machines, we try to install java web start and run the developed app, it works fine. For one of the clients machine, we have an issue with java web start itself, it does not startup and bring up the application manager. When you start java web start, it shows up the splash screen 'java web start 1.0.1' after some time, it vanishes and does not bring up the application manager. I have installed java web start 1.0.1_01 (build 04) installed on Windows 2000 Professional, by default that has installed JRE 1.3.1_04 also.
We verified the system, all the files being existing under c:\program files\java web start dir. And the JRE is also installed fine.
Couple of times we uninstalled, rebooted and installed.
Infact, we have even verified the file types for html, htm, which was set to msoffice, and we have changed to internet explorer. For jnlp file type it was already set to javaws.exe.
Can you please let me know what could be the problem.
Regards,
Nagarjuna Rao Chakka

There's nothing to stop you installing 1.4 or even 1.4.2, it's the jnlp file that specifies which runtime version gets used to run your application - web start can be used to happily switch runtimes like this. You'll just need to have 1.4 and 1.3 installed on each machine. It's a good idea to upgrade the web start client as the old 1.0 version doesn't work at all well with Windows XP, it's structure of storing all the files in c:\program files works against the security restrictions built into XP.
Incidentally the config file you were looking for in under c:\program files\javaws\javaws.cfg, but this is different in later versions.
Your problem is most likely being caused by web start not being able to find the Java runtime version it was installed with, the client may well have installed a newer (or older) version of 1.3 which has broken the configuration.. another reason to upgrade is the old versions are very fragile in this respect; 1.4.2 can find installed runtimes far more dynamically. Fixing the config file above should get things working again, otherwise delete the .javaws directory in the user profile and re-start web start.
1.4.2 is the best at finding runtimes, but is marred by problems with the integration dialogs, locale always reported as en_US and some strange new behaviour with classloaders and malfunctioning auto installers.. jws 1.2 that comes with jre 1.4.1_x is far more reliable.
- Richard

Java Web Start is taking too long time to fill the bar

Hi All,
I am using Eclipse and using JBOSS from Remote and when I am deploying an applent with Java Web Start, it is taking a very long time for filling the bar(taking more time for verifying and downloading Application).
Can anyone help me for fixing it.
Thanks in Advance.

795697 wrote:
Hi,
when I am deploying an Applet with the help of Java Web Start It is taking too much time for verifying and downloading the application.
I am using Eclipse and JBOSS.
This is the problem.
I think you can understand it.I can't. I don't understand what Eclipse and JBoss have to do with webstart and I can't understand what webstart has to do with deploying an applet.
Its all just completely unrelated! I'm just going to make a dumb assumption and say that it is your computer.

Java Web Start and DeployDirector: What's the difference?

I am the product manager for DeployDirector at Sitraka (now part of Quest Software). I'm NOT in sales; I'd simply like to provide you with some information.
From talking with DeployDirector users and evaluators, and from my own discussions with the folks at Sun, I have discovered that there is great deal of confusion about the difference between Java Web Start and DeployDirector. I'd like to clarify this by periodically posting some information about the two.
Though the products seem similar in concept, they are designed for different purposes. They both deploy, auto-update and manage the JRE for client-side Java applications, but beyond that, they are quite different.
Java Web Start is ideally designed for applications deployed over the Internet, where application-provider trust is an issue. Why? The security sandbox guarantees that application can do no harm. (There's some good information about Java Web Start and sandbox apps on ScheduleWorld at http://www.scheduleworld.com/itsYourLife.html) Web Start's architecture simply consists of a client piece that interprets a JNLP file. Because of the sandbox and its simplicity, I believe JWS is best used for independent software vendors, independent developers, etc.
Because DeployDirector is ideally designed for internal enterprise applications, it does not enforce the security sandbox. Trust is not an issue here, because internal users typically trust their internal IT group. DeployDirector's architecture consists of both a client and a server piece, which allows us to support more complex deployment and update scenarios (e.g., scheduled and optional updates) and applications management capabilities like rollback, reporting, exception monitoring, authentication/authorization out of the box. All of this is configured through the DeployDirector administration console.
In some situations, DeployDirector may be unnecessary overhead. In other situations, Java Web Start simply does not provide enough capability and building in this into Web Start can be difficult.
If you'd like more information, we have whitepapers and case studies (including one specifically about DeployDirector and JWS) available on our website at http://www.sitraka.com/software/deploydirector/
If you'd like to discuss some of these differences, or if you have questions about DeployDirector, feel free to email me directly. (Or post here, of course.)
Thanks,
Sonal Champsee
[email protected]

Hi Gerald,
Given what I know about your emnity towards DeployDirector (which is clearly illustrated in this thread: http://forum.java.sun.com/thread.jsp?thread=348061&forum=38&message=1446155 that was evidently a response to this article: http://www.javaworld.com/javaworld/jw-11-2002/jw-1122-autoupdate.html) I'm going to take a (pardon the expression) "don't feed the trolls" approach here.
I'm simply re-iterate that JNLP, and its implementations such as Web Start and OpenJNLP, are designed for a very different set of users that DeployDirector. The differences in functionality between the two products reflect that.
The enterprise has different requirements in a deployment mechanism for its internal, critical applications than software vendors and independant developers. DeployDirector addresses the requirements of the enterprise. Frankly, most of our recent customers only chose to buy the product after initially rejecting it and (unsucessfully) attempting to use JNLP and Web Start. Sometimes people only learn the hard way: different users have different requirements which are suited to different tools or technologies.
Sonal

Override the launch of Java Web Start

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