Problem with Jar

[Victor O'Sullivan]

I finished developing a program in the Eclipse IDE, so I exported it to a Jar file. My computer intially opened up the Jar file using winzip, so i changed the default program to open it with to Java (TM) Platform SE Binary.
Now when I double click on the icon, the timer glass shows for about 1-2 seconds and then thats it, nothing else happens. I can't get my program to open up outside of my IDE.

If anyone could help I would greatly appreciate it.

Thanks.

[Campbell Ritchie]

How did you set the entry point in Eclipse?

Have you read the Java Tutorials section?

[Amirtharaj Chinnaraj]

check do you have main class in your jar and if it is ok
add mainfiest to your jar

[Maneesh Godbole]

Originally posted by Victor O'Sullivan:
.. thats it, nothing else happens.

If you run the jar from the command line, you can find out from the exception(s) what is going wrong and fix it accordingly.

[Victor O'Sullivan]

I ran it from the command line, and again nothing happens. The command prompt just re-appears.

Yes, I have set the entry point in Eclipse. This was done in the Exporting wizard.

The manifest file looks like this

Manifest-Version: 1.0
Main-Class: gui.Main

[Campbell Ritchie]

Is that manifest file finished with a blank line?

[Victor O'Sullivan]

Yes it is

[Campbell Ritchie]

Don't know; you appear so far to have done everything correctly. What command are you using to start the jar from a command line?

And sorry we haven't been able to help any better yet.

[Edit]Alter inappropriate tongue smilie to something more appropriate (Sorry)[/edit]
[ December 04, 2008: Message edited by: Campbell Ritchie ]

[Victor O'Sullivan]

I had been just typing the name of the jar ... may have been a foolish mistake

RecycleProgram1.jar

But recently i tried

java -jar RecycleProgram1.jar 

and the following exception occurred

  ava.lang.ClassNotFoundException: com.mysql.jdbc.Driver
       at java.net.URLClassLoader$1.run(Unknown Source)
       at java.security.AccessController.doPrivileged(Native Method)
       at java.net.URLClassLoader.findClass(Unknown Source)
       at java.lang.ClassLoader.loadClass(Unknown Source)
       at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
       at java.lang.ClassLoader.loadClass(Unknown Source)
       at java.lang.ClassLoader.loadClassInternal(Unknown Source)
       at java.lang.Class.forName0(Native Method)
       at java.lang.Class.forName(Unknown Source)
       at database.DatabseConnection.createDBConnection(DatabseConnection.java:30)
       at database.DatabaseController.<init>(DatabaseController.java:91)
       at database.DatabaseController.<clinit>(DatabaseController.java:86)
       at gui.Main.loadData(Main.java:26)
       at gui.Main.<init>(Main.java:18)
       at gui.Main.main(Main.java:37)
xception in thread "main" java.lang.ExceptionInInitializerError
       at gui.Main.loadData(Main.java:26)
       at gui.Main.<init>(Main.java:18)
       at gui.Main.main(Main.java:37)
aused by: java.lang.NullPointerException
       at database.DatabaseController.createStatements(DatabaseController.java:105)
       at database.DatabaseController.<init>(DatabaseController.java:92)
       at database.DatabaseController.<clinit>(DatabaseController.java:86)
       ... 3 more  

Might this mean there is something missing from my Manifest file in realtion to the DB driver?

[Victor O'Sullivan]

I managed to solve my problem. I informed that I could not put a database driver into my jar file, so I created a .bat file to run a command to execute the jar file and connect to the sepertate driver.

A scincere thanks to everyone who helped along the way.

[Campbell Ritchie]

Well done sorting it out.