Passing a parameter to a Web start app

Hi, I'm having trouble getting a single integer value into my web start application. I understand how you do this with a JNLP however I need a different value for this integer depending on a PHP script. With applets it was fairly simple but with web start apps it seems a little more complex - the only way I could think of was to recreate the entire JNLP file via the PHP script which seems a bit cumbersome if all that's changing is a single integer.
I had a look around on the web for information about this but it seems that information on passing parameters to web start applications is few and far between.
I'd be very grateful for an answer!
Thanks.

alex.p wrote:
So in this case how would I pass the integer as a parameter to the webstart app. Is there no way of simply putting it in the link to the JNLP e.g ?
You could do that if you liked. Is there some expectation that the user will run the web start application after you do that? Or that the user won't already be running it? Or that the user will ever run it? I think you should back up and try to figure out what the point of this parameter is. Is it supposed to make something happen? Or are you just changing the application for the next time a user gets around to using it? Or what? As I said, this really doesn't make much sense so you need to provide a requirement that does make sense if you want to get anywhere at all.

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My web start app doesn't get cached

Many apologies if this topic has been covered before but I have extensively searched the archive and can't seem to find it.
I have made my own trivial web start app and it downloads and works fine with my installed web start software. The problem I have is that when I launch the web start application manager and start my app from there the app does not apear in the "downloaded applications" section and hence I can't get to run it unless I have a connection.
Firstly I though I may be missing the <offline-allowed/> element from the JNLP file but it wasn't that. Then I thought it may be because my jars aren't signed but then the examples from sun worked OK and they weren't signed at all.
I have checked in the web starts cache directory and it looks to me as if the correct jars are in there but still the application manager won't show my app as one of the downloaded ones.
Any help would be much appreciated.
Gareth Walker

The Java Web Start application Manager will only display applications who's jnlp files are cached.
In order to cache your jnlp file you need to include an href attribute for the jnlp element in your jnlp
file. This may not allways be possible if your jnlp file is programatically generated by a servlet,
but it works for static jnlp files.

Java Signing issues when loading web start app

Hey, not sure if this is the correct place for this - but couldn't think where else to put it...
I'm a bit stuck at the moment and i wondered if anyone could shed some light on my problem, and where I might go from here.
We've developed a EJB3 application that has a web start UI for users to start... The application is developed in Eclipse and compiled and deployed with ant build scripts... When we deploy the application from within Eclipse everything runs smoothly and users are able to start the web start app without any problems... However I've recently tried setting up a Continuous Integration server (Hudson) for us to test new deploys on and for this our build scripts need to be run outside of Eclipse...
This appears to run without a problem, however each time the system is deployed from here the web start application fails to start because web start cannot verify the signing in the client jar
Could not verify signing in resource: http://10.39.216.5:8080/mist2/lib/mist2-client.jarAs far as I can tell from the output of the build everything goes according to plan and there is little difference between the output if the build had been started in eclipse... The only big difference is that when building in Eclipse the build only packs up the compiled code, because Eclipse auto build the application, whereas in Hudson the code is clean built using the ant scripts (which are created by Eclipse)... and if I turn autobuild off eclipse and build the project from scratch using only the build scripts then the same problem arises...
I'm not really an expert on jar signing so I can't really guess at what might cause the verification to fail... any hints would be much appreciated. It feels like there is something that the Eclipse compiler does that is missing from the scripts but I can't think what this might be as the scripts are created in Eclipse
Thanks
Alex

Alex,
I believe your problem might be similar to one I had. According to one forum response (of course I can't find it now), if you have third-party JARs in your application (which in your case would be any eclipse jars), they might already be signed by their originators (as are eclipse jars), which may cause some really strange errors.
The solution for me was to package my third-party (that is, eclipse) jars into their own feature, separate from my application's feature. So, my main jnlp file has an extension to my application's feature jnlp, and that feature's jnlp file has an extension to yet another jnlp file containing the list of third-party (eclipse) jars. Of course, your jar list will probably be different than mine.
Here's all three files. Hope this helps!!
Calvin.jnlp (the main jnlp file):
<?xml version="1.0" encoding="UTF-8"?>
<jnlp
spec="1.0+"
codebase="http://bet/ERS"
href="calvin.jnlp">
<information>
<title>ERS</title>
<vendor>NIAT</vendor>
<homepage href="http://niat.net"/>
<description>Electronic Record System</description>
<icon href="icon.jpg"/>
<icon kind="splash" href="splash.jpg"/>
</information>
<security>
<all-permissions/>
</security>
<resources>
<j2se version="1.6+" max-heap-size="256m"/>
<jar href="org.eclipse.equinox.launcher_1.0.101.R34x_v20080819.jar" main="true"/>
<extension
name="Calvin Feature"
href="features/net.niat.calvin.feature.jnlp"/>
<property
name="osgi.instance.area"
value="@user.home/Application Data/calvin"/>
<property
name="osgi.configuration.area"
value="@user.home/Application Data/calvin"/>
<property
name="eclipse.product"
value="net.niat.calvin.product"/>
</resources>
<application-desc main-class="org.eclipse.equinox.launcher.WebStartMain">
<argument>-nosplash</argument>
</application-desc>
</jnlp>
net.niat.calvin.feature.jnlp (the extension's jnlp):
<?xml version="1.0" encoding="UTF-8"?>
<jnlp spec="1.0+" codebase="http://bet/ERS">
<information>
<title>ERS</title>
<vendor>NIAT</vendor>
</information>
<resources>
<jar href="../plugins/net.niat.calvin_@[email protected]"/>
<extension name="RCP" href="org.eclipse.rcp_3.4.1.jnlp"/>
</resources>
<component-desc></component-desc>
</jnlp>
org.eclipse.rcp_3.4.1.jnlp (the repackaged eclipse files jar feature):
<?xml version="1.0" encoding="UTF-8"?>
<jnlp spec="1.0+" codebase="$$codebase">
<information>
<title>Eclipse</title>
<vendor>eclipse.org</vendor>
</information>
<resources>
<jar href="../plugins/org.eclipse.core.commands_3.4.0.I20080509-2000.jar"/>
<jar href="../plugins/net.niat.calvin_2.6.2.11.jar"/>
<jar href="../plugins/org.eclipse.core.commands_3.4.0.I20080509-2000.jar"/>
<jar href="../plugins/org.eclipse.core.contenttype_3.3.0.v20080604-1400.jar"/>
<jar href="../plugins/org.eclipse.core.databinding_1.1.1.M20080827-0800b.jar"/>
<jar href="../plugins/org.eclipse.core.expressions_3.4.0.v20080603-2000.jar"/>
<jar href="../plugins/org.eclipse.core.jobs_3.4.0.v20080512.jar"/>
<jar href="../plugins/org.eclipse.core.runtime.compatibility_3.2.0.v20071008.jar"/>
<jar href="../plugins/org.eclipse.core.runtime_3.4.0.v20080512.jar"/>
<jar href="../plugins/org.eclipse.equinox.app_1.1.0.v20080421-2006.jar"/>
<jar href="../plugins/org.eclipse.equinox.common_3.4.0.v20080421-2006.jar"/>
<jar href="../plugins/org.eclipse.equinox.preferences_3.2.201.R34x_v20080709.jar"/>
<jar href="../plugins/org.eclipse.equinox.registry_3.4.0.v20080516-0950.jar"/>
<jar href="../plugins/org.eclipse.help_3.3.101.v20080702_34x.jar"/>
<jar href="../plugins/org.eclipse.jface.databinding_1.2.1.M20080827-0800a.jar"/>
<jar href="../plugins/org.eclipse.jface_3.4.1.M20080827-2000.jar"/>
<jar href="../plugins/org.eclipse.osgi_3.4.2.R34x_v20080826-1230.jar"/>
<jar href="../plugins/org.eclipse.swt.win32.win32.x86.source_3.4.1.v3449c.jar"/>
<jar href="../plugins/org.eclipse.swt_3.4.1.v3449c.jar"/>
<jar href="../plugins/org.eclipse.ui.forms_3.3.101.v20080708_34x.jar"/>
<jar href="../plugins/org.eclipse.ui.workbench_3.4.1.M20080827-0800a.jar"/>
<jar href="../plugins/org.eclipse.ui_3.4.1.M20080910-0800.jar"/>
<jar href="../plugins/runtime_registry_compatibility.jar"/>
</resources>
<component-desc></component-desc>
</jnlp>

Java Programming - Run Web Start App Through IDE Using Existing JNLP(s)

I apologize for the cross post. I believe I mis-posted the first time. The thread belongs here.
http://forums.sun.com/thread.jspa?threadID=5434826

You might try pointing JaNeLA *(<- link)* at it, and fixing any errors it reports. Ignore any optimisations suggested. The optimisations are not properly debugged and would not cause the kind of errors you report.
Oh, and a ++++ to that advice to to ensure the console pops open when encountering a web start app. Make sure the code is not [swallowing exceptions|http://pscode.org/javafaq.html#stacktrace] *(<- link)* at any stage.

Pick Your Web Start App Of The Week

Hi,
I invite you to post your comments about your favorite Web Start app here.
Every week I will profile a different Web Start App at "The Saturn Times" - http://vamphq.com/times - including your quotes.
Post early, post often and help promote all the great Web Start apps out there.
- Gerald

Your jnlp checker Vanessa is quite useful.
Is the source available, because I would like to fix a bug or two I noticed.
Then check out Gentleware's Poseidon.
http://www.gentleware.com/download/Poseidon4umlJWS.jnlp
It is a commercial version of Tigris.org's ArgoUML, a free UML editor,
which is webstartable as well:
http://argouml.tigris.org/files/documents/4/0/0100/ArgoUMLWebStart.jnlp
Interesting about Poseidon was how they implemented key registration for their JWS app, a common task for commercial applications.
However Poseidon unwillingly illustrates limitations of the present JWS implementation - this beast is large (about 10-30 MB).
I loaded it at home via an ISDN link (8KB/s) and it took much time. The download was interrupted for several times, I hadn't start to download again from zero, because the app is splitted into several smaller jars, but still had to reload interrupted jars.
Some days later it turned out that the disk I had the JWS cache on got full. Thus I wanted to move my precious downloads to another partition, which is not possible. You can't move cache contents elsewere, so I had to redownload it again later (ouch).
An interesting bit about ArgoUML is how they speed up their large app by forcing class loading in a background thread. I saw that in their source and want to try out that technique myself soon, perhaps it gives a little speed advantage.
Regards,
Marc

Java Web Start.app, apparent problems.

I have been experiencing many small problems during web browsing, etc. and have received terrific help from Barry Hemphill but he is unable to help on Java matters.
When I open Java Web Start app. I get the following message; "You cannot open Java Web Start.app because it it is damaged or incomplete". This is possibly, at least by the app's. name the cause of my troubles, though I am guessing. Can anyone guide me to where I can download and re-install the app. to see if it does overcome my problems. A typical one of them is happening as I type, the screen characters are lagging heavily behind my two-finger typing.
Brian Hope
MacMini Mac OS X (10.4.10)

Hi Brian, Happy Holidays!
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http://java.com/en/download/faq/java_webstart.xml
See also...
http://www.digistamp.com/t3runMac.htm

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Hi,
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Thank you

Hi Messer,
I have put in the syntax as below :-
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I am new in CRMOD, hope that you can advice on this.
Thank you,
SK

How to pass command line arguments to Web Start appclient?

Hi,
I would like to pass arguments to appclient, but "javaws" unable to do that.
Do I have to overwrite the JNLP? I use Sun Appserver 9.0, it creates JNLP on the fly!!!
Please help, thanx!
MB

Hi, MB.
If you are talking about the automatic Java Web Start support for launching app clients in GlassFish, you can pass the equivalent of command line arguments using the query string of the URL you use to launch the app client.
Briefly, use
http://host:port/client-path?arg=first-arg&arg=second-arg& ...
specifying the argument values in the order that you want them passed to the client.
The GlassFish server will do the right thing and generates the correct JNLP so your arguments are passed to the app client.
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How to call Web Start app from Web Start app?

Is there a way to call another Java Web Start Application from a running
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Could this be done in a way that there won't be another virtual machine
launched; i. e. that the started Application will run in the same virtual
machine as the calling one?
Cheers,
Tobias

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        BasicService basicService = (BasicService) ServiceManager.lookup(
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        log.log(Level.SEVERE,
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S

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.
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How to get data passed back to server from Web Start client ?

dear experts,
my web application allows users to launch a web start window from the jsp page, after users enters some data in the web start page and press "OK", the data entered should be passed back server for process. i just have not much clue how to do this....
thanks.

Use the java networking library to send a request to a url that takes the arguments you want to pass in.
Example:
URL url = new URL("http://yourserver/yourhandler.do?arg1=foo&arg2=bar");
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... any output testing, etc...
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Hi All,
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I'm using the following...
Java version: 1.6 1.6.0_17
Operating system: ( I've tried XP and Vista)

I have the same problem, please anyone can help?

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Hi there
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I'm pretty sure this has been answered here before, so you may want to do a search to get a more complete answer. Basically, you need to sign the other JAR files with different certificates in a separate resource extension jnlp file, something like:
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and then list the other jars in that file, something like:
<?xml encoding="UTF-8"?>
<jnlp spec="1.0+" href="help.jnlp">
<information>
<title>JavaHelp</title>
<vendor>Sun Microsystems, Inc </vendor>
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<resources>
<jar href="jh.jar" />
</resources>
<security>
<all-permissions />
</security>
<component-desc/>
</jnlp>

How to convert existed standalone APP to java web start app?

hello:
I didn't find useful information about how to convert an existed java
app into app which can be launched using java web start from the sun java developer's guide.
I have designed a simple java applcation and want to lauch this program with
java web start techniques(on local machine only). Is there any easy way that i could convert my program to the one which support java web start, so i can double click the *.jnlp file to launch my java applcation.
thank you
-Daniel Mark

i just found a great place to resolve my question.
If you had the same question, please refer to
http://www-106.ibm.com/developerworks/java/library/j-webstart/
thank you
-Daniel

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I've personally tried crashing the app by using screen savers, but I cannot duplicate the problem. I've also tried letting my computer go into standby mode and I've let it hibernate. But every time, the application continues running as soon as I log back in.
Any ideas as to why the screen saver could trigger a problem like this for some users?

>
I've written a Java Web Start ... . The only problem is that there are a couple of people who from time to time find that the application has crashed when they unlock their Windows screen saver. >What screensaver(s)? Some important distinctions might be
- Windows standard savers (the savers supplied with the OS, if so, do they all use Open-GL or all use...?)
- Windows compatible, 3rd party savers.
- Saverbeans screensavers (Java based). E.G. <https://screensavers.dev.java.net/>

Passing a parameter to a Web start app

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