Application upgrade with Java Web Start

Dear all,
I need your help for my question.
What I need is the following. I developed an application with javafx. I want to create an exe file with an installar for the application. After application is installed, in a nex momento I want to distruibuite upgrade of application (for bug fixing for example).
I read about Web Start & JNLP but I didn't understood at 100%.
Should I obtain what I need?
That is, user from application clicks on Update button and application is updated to last version?
Or is it useful only for jre update?
PLease help me to understand, I want to know if I can use this technogy for upgrade system of my application.
Thanks,
Regards

Why always expect applications HAVE to run everywhere when the targeted users only dwell on Windows...
So far, I have found JWS to be unreliable for everything and even worse for JavaFX. Tried different settings (background, timout, etc.) in the JNLP for the updates and none work as expected. Basically the app may update but sometimes does not and no one can figure why... Sometime the app installs but JWS only gets a partial download of the JavaFX runtimes and still launches the app which either result in an undecipherable JWS error or the application crashing because some of the JFX base classes are missing. Of course sometimes the install fails and we still get an undecipherable JWS error... Sometimes it fails but the app get installed... sometimes the shortcuts are not installed or they get deleted but no re-created after an update or they loose their icons... and the list goes on and on... arf what a nightmare...
On some computers, offline launch sometime still need a 2 minutes timeout to start on Windows and never start on Linux because... it tries to go online...
Generally speaking for JFX it used to work better in 1.6.0_14 or earlier but each Java 6 release since has make JWS become more and more flawed.
Furthermore, there still the matter of tons of JWS issues that are yet to be corrected, like JWS irremediably crashing it's own cache from time to time or not always updating all the app's JAR files (that error was difficult to isolate and identify) or loosing app reference when updating the JRE. Additionally, the Windows desktop integration still leaves to be desired (app icon looks very bad on recent Windows and for some reason it looks like JWS does not make use of Java2D at all...).
There are ways to create native exe launchers for Java apps like Launch4J and you could make a pure Java app (with a very simple Swing UI) that actually calls the JWS executable to install JNLPs for your JavaFX app. I have done that to distribute a demo of my app on a CD and it usually works most of the time. I say most of the time because I have found some situation while JWS enters a deadlock while trying to register a JNLP and... and then nothing happens.
Additionally JavaFX's licenses prevents from distributing the JavaFX runtimes, so if you want to stay legal you still need to point to the JavaFX JNLP on the JFX site. As an alternate measure I have my launcher detect if there is an internet connection active and then open the browser on the JFX site (I warn the user before doing so) so the runtimes gets pre-loaded before the app is installed. This feels very weak but that was the only real way I could make that work (asking JWS to load the remote JNLP like I do for the local ones usually did not work).
Hopefully at some point they will get rid of that JWS crap, create a good web installer that can aslo be easily used offline and make a API so we can use it from the code... well... I do still hope this may happen some times...

Similar Messages

Problem with CORBA application deployed using Java Web Start 1_6_0.

Java Web Start fans and experts:
We have been using Java Web Start to deploy the client side of a CORBA-based application since the inception of Java Web Start ... including Java Web Start 1.0 right up through the present.
With Java Web Start 1_6_0, we see evidence that Web Start is "tinkering with" the IOR that CORBA uses to communicate. In all previous versions of Java Web Start, independent of the JRE which the application uses, the stringified IOR have been the same size regardless of whether the application is deployed locally or via Java Web Start. With Java Web Start 1_6_0, the stringified IOR is much longer than the "real" IOR (again, regardless of the JRE used by the application itself). To me this smells like a bug in Java Web Start 1_6_0. Has anyone else observed this behavior?
Here are some specifics .... I've run the same client application with various JREs both with and without Java Web Start as the deployment mechanism. The application was compiled and runs against servers that are running JDK 1_5_0_09.
Here is the summary of my results from a Linux box running various JREs, various versions of Java Web Start, and also running as a non-JWS deployed application. I've listed the length of the stringified IOR in each case.
JRE 1.5.0 non-JWS client: stringified IOR length = 344
JRE 1.6.0 non-JWS client: stringified IOR length = 344 ... this, I think, excludes the JRE as the cause of these problems.
Java WS 1.5.0, JRE 1.5.0 JWS client: stringified IOR length = 344
Java WS 1.5.0, JRE 1.6.0 JWS client: stringified IOR length = 344
Java WS 1.6.0, JRE 1.6.0 JWS client: stringified IOR length = 1568
Java WS 1.6.0, JRE 1.5.0 JWS cleint: stringified IOR length = 1568
In all cases, the stringified IOR length is determined by the service receiving the message and is always running JRE 1_5_9_09 and is
always the same 344 characters in length UNLESS it was deployed
using Java Web Start 1_6_0, in which case it in nearly 5 times as big!
To me, it sure looks as if there is a problem with Java Web Start 1_6_0 to be adding so much to the stringified IOR. Note: it's hard to tell how different the underlying IOR is in the JWS 1_6_0 case because, unlike most other ORBs, the Sun ORB doesn't have a tool to extract the IOR into a human readable structure. However, I can think of no good reason why the identical application deployed using Java Web Start 1_6_0 should have a stringified IOR length that is different than that of the same application deployed in non-JWS form or should differ from the behavior seen in all previous releases of Java Web Start.
Any clues or suggestions? Has anyone else observed this behavior?
Thanks,
John

Hi.
I got a different problem. My Corba application works in JRE 1.6, but doesn't works in JRE 1.5.X. I got an unexpected error and my console shows:
getSubjectX500Principal NoSuchMethodError: java.lang NoSuchMethodError
#### Java Web Start Error:
#### null
Can you help me?

JFrame running with Java Web Start

I have a problem with running my application with Java Web Start. My main application window is a JFrame and I have a line of code as below
this.setExtendedState(MAXIMIZED_BOTH);
It runs fine when run on a PC locally. But if I try to run the application through Java Webstart I get an exception. Can anyone help me with this. I would like the JFrame to open maximized.
TIA.

try posting the exception to get better answers. but anyway, i'm guessing its a security issue... your app is trying to access the properties of the local system. you might have to sign your application for this to go away.

Help with Java Web Start

Hi everybody,
I have a simple Java application that has a JFrame containing a TextField displaying some text inside it. I am using the NetBeans IDE. I am trying to Enable Java Web start for this application. The steps I have taken upto now are:
1. Right click on Project, Java Web Start -> Enable Java Web Start. This created the jnlp file.
2. In the Resources section, I added the jar file for swing. ( I am not sure if I have to add the path for jnlp.jar etc, or are these found automatically?)
3. Right click on Project, Java Web Start -> Deploy with Java Web Start. This launches the browser with the Click me link, but on clicking this link, I get the following error.
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
javax.servlet.ServletException: Wrapper cannot find servlet class jnlp.sample.servlet.JnlpDownloadServlet or a class it depends on
     org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
     org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
     org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)
     org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
     org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
     org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
     org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
     java.lang.Thread.run(Thread.java:534)
root cause
java.lang.ClassNotFoundException: jnlp.sample.servlet.JnlpDownloadServlet
     org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1332)
     org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1181)
     org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
     org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
     org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)
     org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
     org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
     org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
     org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
     java.lang.Thread.run(Thread.java:534)I have all the jnlp files in my jdk directory, and I am not sure why it can't find it. Is there something I am missing?
Thanks
George

I am not sure what it has to do with servlets, I just followed a tutorial on using Netbeans with Java Web Start, and did only the steps as mentioned in my first post. And ended up with the error.
Anyways, I added the jnlp jar files(jnlp.jar, jnlp-servlet.jar, jardiff.jar) in the WEB-INF/lib directory. And it seems to deploying it now. I can get my application to load on clicking on the "Click me" link. But the controls on my application don't seem to be working.
Also, when I try to Right click on my project -> Java Web Start -> Run with Java Web Start, I get the following error message,
javaws-run: C:\Documents and Settings\Lux\Visualization\nbproject\build-jaws-impl.xml:36: Execute failed: java.io.IOException: CreateProcess: C:\j2sdk1.4.2_13\bin\javaws "file:///C:/Documents and Settings/Lux/Visualization/Visualization.jnlp" error=2
BUILD FAILED (total time: 0 seconds)
Any help appreciated.
Thanks.
George

Access JAR File while running App with Java Web Start

Hello guys,
I want to delpoy my application so that I can run it when I click on the appropriate button in a web page.
I have a Jar file for all the files that the app needs. No, not all of the files are included.
Indeed, I use JAR files such jdom.jar or postgres...jar that I must use in within my application.
How can I access these JAR files knowing that I can't point to files in a JAR file A from within a JAR file B, if the JAR file B contains the JAR file A?
The main JAR file that I put on the web server can be seen as the JAR file B and the other JAR files must be stored somewhere for the java classes within the main JAR file to have access to them.
I wonder whether there is another way to structure the project.
Thanks.

Hi Andrew.
I have followed your suggestions and here is what my .jnlp file look like:
<tt>
<?xml version="1.0" encoding="utf-8"?>
<jnlp spec="1.0+" codebase="http://localhost:8080/koedops" href="beta.jnlp">
     <information>
          <title>KOEDOPS</title>
          <vendor>Pr. Fischer</vendor>
          <homepage href="http://localhost:8080/" />
          <description>Downloading koedops with Java Web Start</description>
     </information>
     <resources>
          <j2se version="1.6+" />
          <jar href="beta.jar" main="true"/>
          <jar href="jcalendar-1.3.3.jar" />
          <jar href="jdom.jar" />
          <jar href="postgresql-8.4-701.jdbc4.jar" />
     </resources>
     <application-desc main-class="general.Application" />
</jnlp>
</tt>
The three other jar-files reside in the same directory as the .jnlp file and the beta.jar file on the tomcat server.
When I launch the application though nothing happens upon the download. In contrast, if I change the main class to a class file that requires no extra library, it runs perfectly.
I can't be sure whether the jar-files are successfully accessed.
Regards.
Edmond

Using Berkeley Java Edition with Java Web Start

Hi
Have anyone had any experience using Berkeley Java Edition with Java Web Start?. I need to create an application that will download with the database to a client computer and create the database there

Thanks for your reply Luca-Sanna,
This is my jnlp file
<?xml version="1.0" encoding="UTF-8"?>
<jnlp spec="1.0+" codebase="http://localhost:8080/dist" href="launch.jnlp">
<information>
<title>MyApplication</title>
<vendor>My Company</vendor>
<homepage href="/test.html"/>
<description>My Test Application</description>
<description kind="short">My Application</description>
<icon href="test.gif" kind="default"/>
<offline-allowed/>
</information>
<security>
<all-permissions/>
</security>
<resources>
<j2se version="1.5+"/>
<jar href="myapp.jar" main="true" download="eager"/>
<jar href="lib/appframework-1.0.3.jar" download="eager"/>
<jar href="lib/beansbinding-1.2.1.jar" download="eager"/>
<jar href="lib/commons-beanutils.jar" download="eager"/>
<jar href="lib/commons-collections.jar" download="eager"/>
<jar href="lib/commons-digester.jar" download="eager"/>
<jar href="lib/commons-logging.jar" download="eager"/>
<jar href="lib/derby.jar" download="eager"/>
<jar href="lib/derbyclient.jar" download="eager"/>
<jar href="lib/derbynet.jar" download="eager"/>
<jar href="lib/itext-1.3.1.jar" download="eager"/>
<jar href="lib/jasperreports-1.3.0.jar" download="eager"/>
<jar href="lib/jbossall-client-2004-05-11.jar" download="eager"/>
<jar href="lib/jdt-compiler-3.1.1.jar" download="eager"/>
<jar href="lib/poi-2.0-final-20040126.jar" download="eager"/>
<jar href="lib/swing-worker-1.1.jar" download="eager"/>
<jar href="lib/toplink-essentials-agent.jar" download="eager"/>
<jar href="lib/toplink-essentials.jar" download="eager"/>
</resources>
<application-desc main-class="mypackage.Login">
</application-desc>
</jnlp>
I have seen many forums with the same above problem with no reply.
Anyone knows what exactly the problem is?

How import policy file with Java Web Start

hi everybody,
I wrote an application launched by Java Web Start.
This application encrypt data on the client side and POST them to the server.
To encrypt I use JCE packages including sunjce_provider.jar, jce1_2_1.jar and
local_policy.jar and US_export_policy.jar.
local_policy.jar and US_export_policy.jar are not packages, each of them contains
a policy file.
When I test encryption on local no problem, but when I test with Java Web Start
I've got this exception :
java.lang.ExceptionInInitializerError:
java.lang.SecurityException: Cannot set up certs for trusted CAs
It's because the application launched by Java Web Start doesn't find local_policy.jar
and US_export_policy.jar.
There's a problem in my JNLP file :
<jnlp spec="1.0+" href="http://myserver/sources/test.jnlp" codebase="http://myserver/sources">
     <information>
          <title>Java Web Start TEST</title>
          <vendor>NLE Intech</vendor>
          <description>cryptage then upload</description>
     </information>
     <security>
          <all-permissions/>
     </security>
     <resources>
          <j2se version="1.3" />
          <jar href="sunjce_provider.jar" />
          <jar href="jce1_2_1.jar" />
          <jar href="local_policy.jar" />
          <jar href="US_export_policy.jar" />
     </resources>
     <application-desc main-class="HelloWorldSwing" >
          <argument>c:\myfiletoencrypt</argument>
     </application-desc>
</jnlp>
thank you for your answer

Hi Nicolas,
If you migrate to JDK1.4 and use the signed Bouncy JAR, you could resolve the problem,
if you don't want to use unlimited cryptography.
See my posting on your other question.
Agnes
PS. There is a mistake in my other reply, the "local_policy.jar" and the other files must have
to go into JRE/LIB/SECURITY directory

Issue Downloading Resources with Java Web Start

I'm having an issue with Java Web Start downloading resources. After executing the JNLP file, the download will start and the main Jar will download, then the download will just stop. The downloader is still running, but the progress bar just sits and nothing happens. This only will happen on some machines, even ones on the same network. Others download fine, and the application starts correctly. I thought maybe a setting with java web start needed to be changed, but the proxy settings are set to the browser, which are the same for all machines. The JNLP file is below (however, for security reasons the codebase/homepage are left out, but they are correct in the actual file). Does anyone have any idea of what the problem might be?
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
     <jnlp codebase="..." spec="1.0+">
     <information>
     <title>Java3D Test</title>
          <vendor>None</vendor>
          <homepage href="..." />
          <description>Test application for Java3D</description>
     </information>
     <update check="always" />
<security>
     <all-permissions/>
</security>
<resources>
          <j2se version="1.5+"/>
     <jar eager="true" href="TestJava3D.jar" main="true" />
          <jar href="lib/Library.jar" />
          <jar href="lib/Java3D.jar" />
          <jar href="lib/j3dnative.jar" />
     </resources>
<application-desc main-class="testjava3d.TestJava3DMain">
</application-desc>
</jnlp>

You could enable JavaConsole and turn on tracing to get more debugging info. See: http://docs.oracle.com/javase/7/docs/webnotes/tsg/TSG-Desktop/html/plugin.html#gcexdf

Using Xerces with Java Web Start

I read that there might be problems using xerces with Java Web Start, because JWS uses Sun's implementation of JAXP internally. My application needs Xerces and I think I am able to get it working using the following settings in the JNLP file:
<resources>
<j2se version="1.3"/>
<jar href="xerces-1.4.3.jar"/>
<property name="javax.xml.parsers.DocumentBuilderFactory" value="org.apache.xerces.jaxp.DocumentBuilderFactoryImpl"/>
</resources>

Hi,
I have packaged the xerces jar into my code jar and it does work. HTH
Aniruddha

Problems to download with java web start

Hola to all.
I have the following problem. My application not discharge of the server when you exist a new version. The application runs off line but when exist a new version must download the last version, is the idea.
If I execute for first time the "launch.jnlp" file ( that is to say in the client equipment never execute the application ) java web start connects and download correctly the application and starts application, and creates the icon on the screen. But if the application already existed java web start executes the application that there is in the client and not download the new version of the server. I think, that problem its happen because the time waiting the response of the server is too long, and executes the local application. To resolve this, i execute the application on java control panel in online mode, and this work ok, because find a new version.
I leave you the launch.jnlp file.
<?xml version="1.0" encoding="UTF-8"?>
<jnlp spec="1.0+" codebase="http://XXX/sis/elpaso/" href="launch.jnlp">
    <information>
        <title>El Paso</title>
        <vendor>XXX</vendor>
        <homepage href="http://XXX/"/>
        <description>Sistema comercial de la empresa "El Paso".</description>
        <description kind="short">El Paso</description>
        <icon href="elpaso32.png" kind="default"/>
        <offline-allowed/>
        <shortcut online="false">
                         <desktop/>
                         <menu submenu="Sistemas XXX\El Paso"/>
                    </shortcut>
                    <related-content href="setup.jnlp">
                         <title>Configurar El Paso</title>
                         <description>Configuracion del sistema comercial de la empresa "El Paso"</description>
                         <icon href="elpasoSetup32.png" kind="default"/>
                         <offline-allowed/>
                         <shortcut online="false">
                              <desktop/>
                              <menu submenu="Sistemas XXX\El Paso"/>
                         </shortcut>
                    </related-content>
    </information>
    <security>
        <all-permissions/>
    </security>
    <update check="timeout" policy="always"/>
    <resources>
        <j2se version="1.6+"/>
        <extension name="jnlpcomponent1" href="jnlpcomponent1.jnlp"/>
    </resources>
    <application-desc main-class="elPaso.Main">
    </application-desc>
</jnlp>

The launch file seems invalid. Try checking it, and the entire launch, using JaNeLA.

I can't open or save file with Java Web Start

Hi,
i can't open or save file with Java Web Start:
import java.io.*;
import java.util.*;
public class MetaDataFileCreator {
public String fileNameSpace = null;
public String fileName = null;
protected Properties file = null;
public MetaDataFileCreator(String fileNameSpace, String fileName) {
this.fileNameSpace = fileNameSpace;
this.fileName = fileName;
public void createMetaDataFile() {
try {
System.out.println("file METADATA");
ClassLoader cl = this.getClass().getClassLoader();
String nameFileMetaData = fileNameSpace + fileName + ".txt";
FileOutputStream fileOS = new FileOutputStream(cl.getResource(nameFileMetaData).getFile());
file = new Properties();
file.setProperty("aaaaa", "aaaa");
file.store(fileOS, "");
fileOS.close();
} catch (Exception e) {
System.out.println("Error writing metadata-file: " + e);
System.exit(1);
e.printStackTrace();
I have try also to open a file like this:
ClassLoader cl = this.getClass().getClassLoader();
file.load(cl.getResourceAsStream(nameFile));
also like this:
try {
fos = (FileOpenService)ServiceManager.lookup("javax.jnlp.FileOpenService");
fss = (FileSaveService)ServiceManager.lookup("javax.jnlp.FileSaveService");
} catch (UnavailableServiceException e) {
fss = null;
fos = null;
System.out.println("Error with JNLP");
System.exit(1);
if (fss != null && fos != null) {
try {
// get a FileContents object to work with from the
// FileOpenService
FileContents fc = fos.openFileDialog(null, null);
//FileContents newfc2 = fss.saveAsFileDialog(null, null, fc);
// get the OutputStream and write the file back out
if (fc.canWrite()) {
// don't append
os = fc.getOutputStream(false);
} catch (Exception e) {
e.printStackTrace();
also like this:
File f = new File((System.getProperty("user.home")+"x.txt").toString());
FileOutputStream fileX = new FileOutputStream(f);
OutputX = new PrintWriter(new BufferedWriter(new OutputStreamWriter(fileX, "UTF8")));
OutputX.println(....
but it doesn't work with Java Web Start.
Can someone help me?
How can I open or save file?
thank you.
Sebastiano

Did you specify <all-permissions/> in your JNLP file? Did you sign your code? What error are you getting?

I don't want application show message "Java web start in the bottom of app"

Dear
please help me.
I am using jdk 1.4.1_01 and JWS 1.2. when I launch application through web stat. In bottom of application , the title "Java web start" appears, it also appear in the bottom of popup menu, menu item bar, dialog,...
Can I disappear it.
Please help me.
Thanks

I don't think it's documented anywhere, but if you sign the jar, that message will go away.

Problems with Java web start

Hi All,
I am facing a problem with Java Web Start. Which is the most appropriate version of JDK recommended for SAP XI? I tried
JDK 1.4.2_04
JDK 1.4.2_09
JDK1.4.2_11
JDK1.5.0_01
When I click on Integration repository or Directory for the first time, it loads the jar files and while loading, I get an error msg "Unable to launch Integration Builder". After a lot of retries I get sucess. But still we are facing this issue in some machines. Can you pls let me know if there is any pre configuration or some thing I am missing...
Regards,
Jai Shankar

Did you check the proxy settings in JAVA Web start. Please follow the below instructions.
This could be set to None or to specific for values HTTP Proxy and HTTP Port .
Contact your network administrator for the correct settings.
To change the Proxy Settings:
Select Windows Start menu -> All Programs -> Java Web Start -> Java Web Start
Choose File -> Preferences -> General
Choose None to switch off the proxy settings or Manual to set the HTTP Proxy and HTTP Port.
ChooseOK
Close Java Webstart

Err. in programs copiled with Jdev 9.0.3 and run with Java Web Start

Hi all,
when I build my programs with Oracle9j JDeveloper 9.0.3.988 and I use them with Java Web Start, programs do not run, while when compiled with Oracle9j JDeveloper 9.0.2.x it runs without problems.
The Java version used in both cases is 1.4.0.
Here's an example of the log from Java Web Start:
Error in JavaWeb Start
viewer/imageViewer/ViewerAppState$1 (Illegal Variable name " val$files")
java.lang.ClassFormatError: viewer/imageViewer/ViewerAppState$1 (Illegal Variable name " val$files")
     at java.lang.ClassLoader.defineClass0(Native Method)
     at java.lang.ClassLoader.defineClass(ClassLoader.java:502)
     at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
     at com.sun.jnlp.JNLPClassLoader.defineClass(Unknown Source)
     at com.sun.jnlp.JNLPClassLoader.access$1(Unknown Source)
     at com.sun.jnlp.JNLPClassLoader$1.run(Unknown Source)
     at java.security.AccessController.doPrivileged(Native Method)
     at com.sun.jnlp.JNLPClassLoader.findClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:299)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:255)
     at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:315)
     at viewer.imageViewer.UtilityMenuPane.jbInit(UtilityMenuPane.java:167)
     at viewer.imageViewer.UtilityMenuPane.<init>(UtilityMenuPane.java:155)
     at viewer.imageViewer.UtilityMenuPane.getInstance(UtilityMenuPane.java:147)
     at viewer.imageViewer.ImageViewerFrame.jbInit(ImageViewerFrame.java:179)
     at viewer.imageViewer.ImageViewerFrame.<init>(ImageViewerFrame.java:145)
     at viewer.imageViewer.ImageViewerFrame.getInstance(ImageViewerFrame.java:126)
     at viewer.ImageViewer.execute(ImageViewer.java:30)
     at viewer.Viewer.execute(Viewer.java:63)
     at viewer.Viewer.<init>(Viewer.java:27)
     at viewer.Viewer.main(Viewer.java:40)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:324)
     at com.sun.javaws.Launcher.executeApplication(Unknown Source)
     at com.sun.javaws.Launcher.executeMainClass(Unknown Source)
     at com.sun.javaws.Launcher.continueLaunch(Unknown Source)
     at com.sun.javaws.Launcher.handleApplicationDesc(Unknown Source)
     at com.sun.javaws.Launcher.handleLaunchFile(Unknown Source)
     at com.sun.javaws.Launcher.run(Unknown Source)
     at java.lang.Thread.run(Thread.java:536)
Does anybody know why this happens?
Thanks

Hi There.
We had the same problem with some of our code. We moved the definition of the class from a method out of the method. Like this:
public class{
class{
instead of doing this:
public class{
method() {
class{
This worked with the web start......
Best regards
Jesper Lorentzen

Include JAR with Java Web Start?

Hi,
i am trying to deploy a little java web start application, that sends an email if you click on a button.
If i now deploy the application as a java web start app,
nothing happens, but if i run the little app as normal
JClient app it sends the email.
Is it possible, that java web start does not know, where
the classpath is? And why isn`t throw an exception?
Source:
private void jButton2_actionPerformed(ActionEvent e)
try
HtmlEmail email = new HtmlEmail();
email.setHostName("mail.anyserverintheworld.com");
email.addTo("[email protected]", "Name");
email.setFrom("[email protected]", "Name");
          email.setSubject("What do you think it this?");
//          //          set the alternative message
          email.setTextMsg("Your email client does not support HTML messages");
//          send the email
          email.send();
          }catch (Exception ex)
               JOptionPane.showMessageDialog(Form.this,"laba",ex.toString(),JOptionPane.INFORMATION_MESSAGE);
}

Christian,
if it can't find the classpath of something, then it wouldn't be able to find the classes comntained and throw a class not found exception. So there must be some sort of error message showing somewhere. If not, use System.out.println() to write your own debug statements.
Another hint, instead of handling the Exception, throw it so that the Webstart console shows the stack trace. Maybe the problem you hit is a security issue of not being granted the permission to use sockets or network connections to send the email.
Frank

Application upgrade with Java Web Start

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