jar in Jdk 1.7

How run jar file using jdk 1.7. and When i run simple program HelloWorld.java run through command-prompt then compiler show at runtime could not load main class. Tell me solution.

Thanks in advance

Welcome to the Ranch.

Please show us your code and tell us the exact commands that you are using to compile and run your application. Right now you haven't given us enough details to tell you exactly what's wrong.

Sir, My old jar file which i created through Eclipse and netbean and new created jar files not run. but code is running in eclipse and netbean.

When i click on created jar file . then it generate pop window which show error: unable to launch application.

when i click on details then it show....

MissingFieldException[ The following required field is missing from the launch file: <jnlp>]
at com.sun.javaws.jnl.XMLFormat.parse(Unknown Source)
at com.sun.javaws.jnl.LaunchDescFactory.buildDescriptor(Unknown Source)
at com.sun.javaws.jnl.LaunchDescFactory.buildDescriptor(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)

Khushdeep Singh wrote:How run...

Please don't abuse colors like that.

It makes your post hard to read. Only use color sparingly for highlighting or correlating small amounts of text.

Thanks!

Jeff Verdegan wrote: . . . Please don't abuse colors like that. . . .

I have got rid of the green from the text.

And what is in the manifest file in your .jar?

Are you trying to run the application as a Java Web Start application?

My manifest file contain....

Manifest-Version: 1.0
Class-Path: . Reader_lib/poi-3.7-20101029.jar Reader_lib/itextpdf-5.1.
3.jar
Main-Class: DateReaderMain

where DateReaderMain is main class.

and i run this application as Java Application.

This application work in eclipse. but when i create jar file of this application through eclipse but jar file not working. Even my old jar files which working on old version of jdk 1.6 . but not working on jdk 1.7.

What is the exact command that you are typing in on the command prompt to start the application?

Is your DateReaderMain class not in a package?

. . . and I presume by the blank line in your post that you have a blank line at the end of the manifest file; that blank line is necessary.

The stack trace that you posted indicates that you're trying to run the application via Java Web Start.

Khushdeep Singh wrote:MissingFieldException[ The following required field is missing from the launch file: <jnlp>]
at com.sun.javaws.jnl.XMLFormat.parse(Unknown Source)
at com.sun.javaws.jnl.LaunchDescFactory.buildDescriptor(Unknown Source)
at com.sun.javaws.jnl.LaunchDescFactory.buildDescriptor(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)