How do i fix java.lang.NoClassDefFoundError in mobile?

Most JVM errors on a BlackBerry, can be fixed by simply reloading and updating your device software. For instructions on how to reinstall or upgrade your BlackBerry software, please see: HOW TO: Install New Software and Update (Application Loader) - BlackBerry®

There are some JVM errors that can not be fixed in this method, if you do encounter one of the below JVM errors, please call customer care at 1-800-937-8997 or 611 from a T-Mobile phone for further troubleshooting.

• JVM Error 501
• JVM Error 517
• JVM Error 535
• JVM Error 547
• JVM Error 548

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Take me back to the BlackBerry Knowledge Base

***This link will show you how to reload new software with screen shots and a video!!!

http://forums.t-mobile.com/t5/BlackBerry-General-All-Devices/HOW-TO-Install-New-Software-and-Update-Application-Loader/ta-p/306005

***when this helps please give me credit and rate me appropriatlly, please!*****

1. Connect the BlackBerry device to the computer using the USB cable.
2. Open BlackBerry Desktop Manager, and then double-click Backup and Restore.
3. Click Backup.
4. Save the backup file.

1. In BlackBerry Desktop Manager, double-click Application Loader.
2. Click Next.
3. On the Device Security Password screen, type the BlackBerry device security password, and then click Next.
4. On the Device Application Selection screen, click Next.
5. On the Completing the Application Loader Wizard screen, click Advanced. The Device Data Preservation screen is displayed.
6. Select the Erase all application data check box, and then click Next.
7. Select Do not automatically back up and restore the device application data during the loading process, and then click Next.
8. Click Finish. The BlackBerry device resets. This might take several minutes.