JNLP file output to server.

Is it possible to implement file input/output to the server that the web start is being deployed from? For example, can I write a JNLP program that will read or write a text file on the server that it's being called from?
Thanks a lot!
~SJ

Actually never mind the question. I found a work around.

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Settings for jnlp files in Web Server 6.0

What it should be in the classpath to make IPlanet Web Server 6.0 work with jnlp files? MIME type for jnlp has been set, but IPlanet just displays jnlp as an xml file on the client machine. Client machine has WebStart installed, and everything works with Tomcat web server.

Hello, I am having the same problem, a lot later. Did you ever solve this issue? I set the mime.types file, but when I add a path to the web-apps.xml file, it no longer will load jnlp files in the browser, it just displays the text.
I tried setting mime-mapping in the web.xml, but it has not effect in iPlanet, but works in Tomcat. Any one have ideas?

Problem in jnlp file

hi,
For sandbox i created the repository.jnlp file and used.
at the same time i created the repository.jnlp file for developement server but it giving the error as
"com.sap.aii.utilxi.misc.api.ReconnectRuntimeException"
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i think there is problem in rmi port..
Is the RMI port is same for both sandbox and Development server????
regards
sasi

hi,
ur not able to see the file in development pls do chk with the client nos and ports
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sampath

JNLP-file's

Hi all.
I'm trying to make an application Web Startable and came up with the following problem:
Due to customers' low-bandwidth Internet connections we have to distribute the software in CDs too. The installation from CD works fine, but the modified date of the .jnlp file which gets cached is the current time, i.e. the time of the installation. Now suppose that there are new updates available on the server and of course a new jnlp file, put there e.g. 26.8.2005. If the customer for some reason installs the software from the CD later, the "timestamp" for the old .jnlp file is newer than of the actually newer .jnlp file's located on the server and therefore won't be updated.
Is there any workaround other than just touching the newest .jnlp file on the server on regular basis (which seems idiotic)?
The application must be able to be launched off-line, so a solution to somehow avoid caching of the .jnlp file won't come in question. I'm using the jnlp-servlet and TomCat.
Thanks in advance!

I use simply TomCat, since I'm only testing on my own computer. I must be missing something fundamental here so try to bear with me...
What do you mean a file is modified at one time and put on the web later ?What would be wrong with the following scenario?:
Suppose that the latest release of the application is made and the jar files and jnlp file in question are modified, their "Modified Date" field becomes e.g. 29.8.2005 10:15. Now I put them on the server at 15:15 the same day. At 15:10 a customer happened to download the older version and the date modified -fields of those files in his local cache became --.15:10. Now when the customer starts the application online, the latest version won't be downloaded because the date modified -field of the jnlp file on the server is older, --.10:15.
If I touch the jnlp file manually to change its modified date field when I put it on the server, this won't become a problem. But in the case where the application is provided on CD, the newest version wouldn't be loaded if the customer installs the older version after I've put the newest release on web.
I'm also using the JNLP DownloadServlet which fills the macros $$codebase etc. in my jnlp file.
If only the local cached versions of the jnlp-files had the "right" date modified fields (i.e. the original and not the date&time of installation) in them this wouldn't be a problem...

JNLP File Generated By A Servlet

Based on configuration issues with our system build, I have created a servlet that generates the JNLP file for an app we have created. Once the file is written and contains all the dynamically generated info, it is never written by the servlet again.
I noticed in creating the servlet, initially, that I actually HAD to write the JNLP file. Returning the JNLP file and setting the mime type in the HTTP response was not enough. When Web Start is invoked by the browser, it goes back to the stored JNLP file on the server.
Can anyone explain why this is necessary?? Its seems redundant. If I can create the JNLP dynamically and pass it back to the browser, why must Web Start retrieve the JNLP file AGAIN from the web server after it launches??
John Turner
Software Engineer
Context Media, Inc
[email protected]

There is a limit to what you can do with dynamically generated JNLP files. The combination of codebase and href must exactly specify the JNLP resource that you are retrieving. If you're using a servlet with parameters in a query string to generate the file, it should look like this:
<jnlp spec="1.0+" codebase="http://app.datadevelopment.com/app" href="MyServlet?param1=value1&param2=value2">
As long as the MIME type returned by the servlet is "application/x-java-jnlp-file", JWS will start just fine. Unfortunately, JWS will then bomb badly because it tries to use the href attribute as part of the file name for saving the file, and Windows at least doesn't like question marks in a file name.
A workaround is to replace the query string with path values:
<jnlp spec="1.0+" codebase="http://app.datadevelopment.com/app" href="MyServlet/param1=value1/param2=value2">
I'm not 100% sure that this will work with the '=' sign as my application needed only one parameter so I dispensed with the paramN=valueN and replaced the directory with valueN only. The point is, though, that each and every time the application is launched JWS will go to the web server to get the latest copy of the JNLP and the only way I have found to dynamically generate the content is to append the necessary parameters as path names after the script (JSP in my case, servlet in your case).
If you have multiple parameters and the '=' sign is a problem, strip out the parameter name and require that the parameters be specified in the same order each time. Use one directory delimiter per parameter.
You can use request.getPathInfo() to retrieve the path after your servlet.

JNLP file version based update like Jar files version?

Dear All,
We are using the JWS from the past one year. Its working fine except one or two issues.
Here i am explaining one of those issues:
When user double clicks the icon on his desktop, first the JWS checks for updates. If updates found it will download the updates and starts the application.
JWS doing the updates checking as:
First its checking the time stamps of the client and server JNLP files. If server JNLP file time stamp is grater than client JNLP file time stamp, then its checks for each and every jar file update.
For Jar files update we are using the version based. Our JNLP file is as shown below:
<jnlp spec="1.0" codebase="$$codebase" href="LaunchMedplexus.jnlp">
<information>
<title>CBST</title>
<vendor>CBST</vendor>
<description kind="short">CBST</description>
<icon href="../../../../images/image1.gif" kind="splash"/>
<icon href="../../../../images/image1.jpg"/>
<offline-allowed/>
</information>
<security>
<all-permissions/>
</security>
<resources>
<j2se version="1.4" initial-heap-size="48m" max-heap-size="256m"/>
<jar href="../../../../JARS/AppJars/POMS/admin/admin.jar"      version="7.7.0.0" />
<jar href="../../../../JARS/AppJars/POMS/billing/bil_adj.jar"      version="7.7.0.0" />
</resources>
<application-desc main-class="com.test.security.Login">
</application-desc>
</jnlp>
we are facing the problems because JWS updates checking is based on the JNLP file time stamp.
is there is any way in JWS to check the updates based on JNLP file version instead of timestamp (like jars version based)?
Our Environment is :
JRE : 1.4.2_10
OS : Windows 2000/XP
thanks in adavance
Krishna Mohan.

Dear Andy,
Thank You for your reply.
perhaps you can use a simple jnlp file that referre to almost all of the application using a versioned jnlp component extension.can you explain this line little more elaborately.
thanks in advance
km

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001B2274001802007051                                 0 20070519CTLMEA      RPTIME00043900 #
###9##;c_5####Tj#y#.##'###u###<#<##d9{y#+##G9###T>j(###^###K####q##########C##dA4####ձ###x##
R[#!#J##ڢw###u#-C#'Qho#箐}j##w%##/#'ZhW##s###nи#ڻ>-J#####Ж#tP}##Hu#}Q7###Sh_###C4<3nqk##i l#
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####M##S##IM#z0#o##ԭ####!#V#9###ں#?s##[#####V&#˴s#&#56196;&#56590;[#l#s##뷢:#Զ{Ȥ&#55960;&#57086;M-##v@#########v#߲###s##
9Q##!#d#####`#############Lc####J#######%?######E#HV3#(#N####Wl####}S#O######zA[##m####u/7#T
##2#s##Q#umF]##Z###}##݂###a######z1#`#####됞-###Q#o#####Q###x#######7Z[##?#V#e##nI####O1=u[#
##p##Kj#####]#####/5#20{####Ӝ##x##A#?###xa##/<^#Rj䅥#######xI#+j#%###$##$######p=##V#Ԋ
#######k#K##yI#yI#!/)#y#z##-y######"/#eڵ##/############*###"/_##-##+##/#y9#####5#9/#yI#A#
###################J/yih=####u4i#K##t####ܞ######=##AX###J##z#####KC믔## /###G{#K#####
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001B2274001802007051                                 0 20070519CTLMEA      RPTIME00043900
ãÔ?®zåÖ#Iï-_Î-ør7##*Ódöã ²äÐÁSjòä`ëÏ©"yÿï¾E#[µºEW#g#2éu##a±¸u~#ZäTéR¯F&o#C·¼åÈÝÁ%½ß´y6+##¿
íE#z!#â#ùG#>{#éJæ##jÅSM<±òxwÆüI¾jâ#µ#ù
íQ ÕÈ###dÝ#/«#ycãA¼#ø#7#¿#¼#íxãý#y«#o#â¡ùéËÖ_C¼½À4ðÀó#Ð8?qÊ#O½Î¿_##b#xjÛÓ#OÜ#×gÌ#×ós##
í¡ùh¿~ëÊÓü#ò#'¡#Á#â©#<áoú#'Ô®ü#»L»þ#y)hà#ç#Z[¡#'®Uy1?YC<Ýú#iÇÇ###Íç'Ô#§#Ù#O§#f<###B{#§##ñ
#0H}¬#^##6¨7V¨7VÚX#M9&#A#øG º'õxOù§ø #W¨Å+Ðb#ÉÇ7#SôRXß\u00A7à#wE"#mê#óÀd# ¼##gn###:ô#E<#######ú
ûJ¦H}#·¦Y½â>ºbò#xSSÿÿÕ«óG#ï#6²f´Ú¾fyqèhJÖçCOr´#Ý#S?##KËÄ×mâë¶x)º×ªh2Åw8&í####7 `Ùo#ö»#òöw$
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èÁ##<(#ÿ#¢²ÿ#è#éc#z¾vçÌá#¹#ý#x%ìÜ#çÌ##ùÍÙ#¹{Ç¯epmâí#¸Ö##¸=ÝÙ½¹uë·,ù#þ¼øl###£åg#,##-`q#ÿøæï
viÁ#]3#.O#þÊöèR##=##L#LÊk###¤à##ó#'V052 øé]+####ã!ÁC#s#q###åLj##Á¯Æ4#.àíT#¸Þ¹µ·¶É)ç#Ïå#<#/ð
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By default where do reports write output files on web server

I am running forms and reports over web. I am running a form which on the click of a button runs a report. Using the
Orarrp utility (I already have) I want to print this report.
In my form trigger I am using the run_report_object and I set report parameters DESTYPE to File, and I set
DESNAME giving it a file name. When report finishes, I use Show_Document('http://server:domain/filename.ext','_blank'), it returns the 404 error, The requested URL
/receipt.rrpa was not found on this server.
Can anyone tell me, by default where the server writes the file output? I have checked under
$ORACLE_HOME/reports60/server/cache but did not find my output file.
Is there a way to specifically direct the output file to a directory, and have the reports server recognize the path?
Perhaps using some sort of 'Virtual Path' in the server configuration, but where?
Any help is appreciated?
Regards
Mark

Hi Mark,
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Opening Output Stream to a file on the server from Applet

Hi,
I am trying to write a little applet which parses a file found on the server , lets the user select some Strings then write the selected Strings to a different file on the server. I use the following code:
String fileName = new String("LineUp");
URL docBase = null;
URLConnection conn = null;
try {
docBase = new URL(ApppletName.codeBase, fileName);
} catch (java.net.MalformedURLException e) {
System.out.println("Couldn't create image: "
+ "badly specified URL");
try {
conn = docBase.openConnection();
} catch(IOException e) {System.out.println(e);}
String playerString;
try {
conn.setAllowUserInteraction(true);
conn.setDoOutput(true);
conn.connect();
PrintWriter out = new PrintWriter(
conn.getOutputStream());
etc..
The problem I am having is that the getOutputStream routine for the connection object does nothing other than throw an exception (I've stepped through the code and that is all the routine actually does). The connection is actually made but no output stream can be created. I have looked at the Java Tutorial (as I am fairly new to Java) and found a spot where they tell you how to write to a file on the server, which is the example I have followed. Any suggestions? What am I missing?

Yes, that's what I thought. It talks about writing to a URL, and you have interpreted "URL" as if it meant "file". A URL is a "Uniform Resource Locator", which is a string that identifies a "resource" on the server. Often that corresponds to a file on the server, but not always. It could be a page that is dynamically generated by a script on the server.
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Specific version of jre in .jnlp file and downloading from local server

Hi,
I have couple of questions regarding the specific version of jre in Java WebStart.
1) I have specified the jre version in .jnlp file as below.
<resources>
<j2se version="1.3.1_02"/>
</resources>
When I saw the File/Preferences/Java of Java WebStart installation, there is an entry with the "Product Version" value as 1.3.1_02 as I installed jre also before launching my application. Still it complains as,
The application has requested a version of the Java 2 platform (JRE) that is currently not locally installed. Java Web Start was unable to automatically download and install the requested version. The JRE version must be installed manually.
Error Code 11 (11 Could not locate requested version) returned from server when accessing resource: (http://java.sun.com/products/autodl/j2se, 1.3.1_02)
When it is there already, why it is trying to get from the Sun's site.
2) I want Java WebStart to download the specified version of jre from my local server, I specified this in the following way,
<resources os="Windows">
<j2se version="1.3.1_02" href="http://host:9095/j2re-1_3_1_02-win.exe"/>
</resource>
I got the error saying,
Bad MIME type returned from server when accessing resource: (http://host/j2re-1_3_1_02-win.exe, 1.3.1_02) - application/octet-stream. where host is my server name. What I need to do here.
Can I have multiple resource tags one for each os.
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Thanks,
Sreedhar.

Hi Sreedhar,
There are some other useful threads in this forum on this topic:
the "Automatically Installing the IBM JRE 1.2.2" thread has tips from somebody who's put together auto-download of JREs from his own web site:
http://forum.java.sun.com/thread.jsp?forum=38&thread=71061
Also, the behavior of the j2se tag is discussed a little in the "Using a specific JRE" thread: http://forum.java.sun.com/thread.jsp?forum=38&thread=158075
The first step is to add an href attribute to your j2se tag. I was just experimenting with this this afternoon,
and it appears that unless that href is specified (even if it's the java.sun.com default autodl URL!) JWS will not properly check locally-installed 1.3.1 JREs. Once you include Sun's autodl URL as an href, JWS will at least properly enforce the product version among locally-installed JREs. Of course, Sun doesn't actually include 1.3.1 in its autodl section, so it won't download it for you, but it will enable checking of the JREs already installed.
The second step is downloading JREs from your own web site, which is more complicated and explained better by other messages in the forum. But basically, JWS is not simply looking for a .exe installer for a particular JRE. It hits the webserver with a query and expects the webserver to give it back an installer's JNLP file. Look at the referenced threads for more details.
Jim

Could not load file/URL (file not found) error for JNLP file

I am completely baffled in trying to figure out why I am getting the following error for some JNLP files but not others:
Error: could not load file/URL specified: C:\Users\tom\AppData\Local\Temp\javaws2
java.io.FileNotFoundException: C:\Users\tom\AppData\Local\Temp\javaws2 (The system cannot find the file specified)
at java.io.FileInputStream.open(Native Method)
at java.io.FileInputStream.<init>(Unknown Source)
at java.io.FileInputStream.<init>(Unknown Source)
at com.sun.javaws.jnl.LaunchDescFactory.buildDescriptor(Unknown Source)
at com.sun.javaws.Main.launchApp(Unknown Source)
at com.sun.javaws.Main.continueInSecureThread(Unknown Source)
at com.sun.javaws.Main$1.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)I have Googled around this forum and elsewhere, and have seen reports that this error is IE-specific, and seems to have something to do with no-cache headers being sent, or with the client browser's cache being full or turned off (which is not my case). I saw the information in the JavaWS FAQ, which recommended turning off security constraints for the JNLP's URI. I tried that, and it didn't help. One of the very baffling things is that I have created several variations of the JNLP file, with varying combinations of jars and property resources, and some combinations always work while other combinations never work. Here's an example:
<jnlp spec="1.0+" codebase="$$codebase">
   <information>
      <title>demo app</title>
      <description>illustrates weird bug</description>
   </information>
   <resources>
      <j2se version="1.5+"/>
      <jar href="randomFile.jar"/>
      <property name="xxx" value="xxxx"/>
      <property name="swing.metalTheme" value="steel"/>
   </resources>
</jnlp>The above file always fails with the error shown at the top of this message. However, if I remove either of the two properties, it works fine. And I have created other variations with lots of properties, some of which work. All of these variations are in the same directory in the war file, served by the exact same servlet (a slightly modified version of the jnlp.sample.servlet.JnlpDownloadServlet provided with JDK 1.6.0_3). Assuming that a no-cache header is the problem, what on earth could be causing some JNLP files to always be served with a no-cache header, while others are never served with a no-cache header?
On a related note, any recommended debugging techniques for seeing what headers are being transmitted? I tried adding a simple check for a "debug=true" parameter in the servlet that causes it to set the content type to "text/plain" instead of JNLP, and that allows me to see (rather than execute) the JNLP XML that's being returned, but it doesn't show me the HTTP headers that are being sent back. If any caching headers are being set, I think it must be being set by the servlet container itself, as it's nothing being set in the servlet code that I can see. So I don't see any way on the server side Java code to output or log the actual HTTP response (or is there?). Any tips in that regard much appreciated.
Edited by: TomC125468 on Aug 19, 2009 1:35 PM

Hi Luca-Sanna,
Thanks for the response. Re browsers, yes, it fails in IE but it succeeds in Firefox. The info on the JavaWS FAQ and other places all seem to indicate that it's an IE issue concerning handling of the cache-control headers.
I should check in my webserver forum (Sun WebServer 7) to see about logging options. Sniffing on the client side is not possible, as my app is required to use HTTPS exclusively, and unfortunately that also precludes a telnet GET request.

Dynamic generation of jnlp file

I'm dynamically generating a jnlp file using a jsp to pass run-time parameters over to my Java application thusly:
<%
response.setContentType("application/x-java-jnlp-file");
String userName = request.getParameter("username");
String password = request.getParameter("password");
String batchId = request.getParameter("batchid");
out.println("<?xml version=\"1.0\" encoding=\"utf-8\"?>");
out.println("<jnlp ");
out.println("spec=\"1.0+\" ");
out.println("codebase=\"http://server/directory\" ");
out.println("href=\"this jsp file\">");
... other jnlp stuff...
out.println("<application-desc main-class=\"myApp.myClass\">");
out.println("<argument>" + userName + "</argument>");
out.println("<argument>" + password + "</argument>");
out.println("<argument>" + batchId + "</argument>");
out.println("</application-desc>");
out.println("</jnlp>");
And use args[] to attempt to get the passed parameters in the Java application:
userName = args[0];
password = args[1];
batchId = args[2];
However, they don't seem to be passed over to the application as I get NullPointerExceptions. If I try to trace the state of the arguments by adding:
FileOutputStream f = new FileOutputStream("w:output.txt");
BufferedWriter w = new BufferedWriter(new OutputStreamWriter(f, System.getProperty("file.encoding")));
w.write("userName: " + userName);
w.write("password: " + password);
w.write("batchId: " + batchId);
f.flush();
f.close();
The output file is completely empty.
1. Am I passing the arguments in wrongly?
2. Why is the output not being written in the file?
My thanks in advance for any assistance offered.
Erkton

Erkton,
I use a similar approach and it does work. The main gotchas I found were typos. I would suggest temporarily changing the
response.setContentType("application/x-java-jnlp-file");
line to
response.setContentType("text/xml");
and looking at your JNLP file as XML and verifything that you got everything write. Look for beginning and end tags, stuff like that.
Once you have it right then switch it back to JNLP.
One other thing to look out for is Internet Explorer doesn't like jnlp files unless they end with a .jnlp extension. I had to rename my jnlp files to end with .jnlp instead of .jsp for IE to parse them correctly. I don't think thats the issue you are running into, but you may want to look out for it.

JNLP file output to server.

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