JNLP for using Java web start

[wanda]

Hi i have developed a swing application and have packaged it into a jar called test.jar. I have created a jnlp file
<?xml version="1.0" encoding="UTF-8"?>
<jnlp spec="1.0+" codebase="file:///homes/rm3710/SelfAssessment" href="selfAssessment.jnlp">
<information>
<title>My app</title>

<offline-allowed/>
</information>
<resources>
<!-- Application Resources -->
<j2se version="1.6+" href=
"http://java.sun.com/products/autodl/j2se"/>
<jar href="test.jar"/>

</resources>
<application-desc
name="My Application"
main-class="MyApplication">
</application-desc>

</jnlp>
However when i try to launch it by runnig the jnlp file i get an error saying
Caused by:
java.lang.ClassNotFoundException: logic.MyApplication
at net.sourceforge.jnlp.runtime.JNLPClassLoader.loadC lass(JNLPClassLoader.java:1401)
at net.sourceforge.jnlp.Launcher.launchApplication(La uncher.java:574)
at net.sourceforge.jnlp.Launcher$TgThread.run(Launche r.java:889)

Please help what to do

[Tolls]

Does that class exist in test.jar, in the correct place?

[wanda]

The class MyApplication exists in the jar file test.jar which i created by using the command jar cf test.jar [input file names]. However when i developed this application in eclipse i had placed all classes under the package logic. The test.jar has only the classes. Should it have a folder logic within which all the classes should be present?

[Tolls]

You need to jar up the class structure, which includes their package directories.

[wanda]

Hi, Thank you for your response. I have been able to launch the application now. However in my application. There is a ceratin interaction with a database. I do not see the database interaction working properly. Could using jnlp have an effect with this?

[Tolls]

What error are you getting?

[wanda]

I dont get errors, it is just that i have a log in page, where the username once entered will be looked up in the database. The application launched through Java web start never finds the user. Hence i concluded that it is not using the database. I developed the project in eclipse where i had used a postgresql referenced library. I ahve exported it into the jar as well. But it does not work.

[Tolls]

You'll need to stick some logging in it to see what's going on.
Does postgres work embedded?

[wanda]

in eclipse i just had the postgresql jar in the referenced library. and i had code in the classes to set up a connection with the database and retrieve the information.

[Tolls]

What database though?
Where is the physical database?

The logging thing still applies, though.

[wanda]

This is the database provided to me by my university. i access it within the university network. its a postgresql database.

[wanda]

DO i need to add some code to the jnlp to specify the use of the PostgreSQL JDBC driver that is packaged as a jar into the test.jar?

[DarrylBurke]

... packaged as a jar into the test.jar?

Java doesn't support nested jars.

db

[wanda]

I have generated the test.jar from eclipse using export as runnable jar. and it includes a folder called org within which the postgresql JDBC Driver package is placed. When i run this jar from the terminal using java -jar test.jar it works fine. But it does not work using Java web start.

[Tolls]

I suspect you need to list it in your <resources> tag in the jnlp.
That tells the client PC that it needs to download the jar file as well.

[wanda]

Thank you very much . i will try this.