Opening Form Generates Error java.lang.ClassNotFoundException: oracle.forms.engine.Main

(Doc ID 1665587.1)

Last updated on MARCH 16, 2017

Applies to:

Oracle E-Business Suite Technology Stack - Version 12.1.3 and later
Information in this document applies to any platform.


On : 12.1.3 version, Forms for App Technology

When attempting to open form, in Java console the following error occurs.

java.lang.ClassNotFoundException: oracle.forms.engine.Main

java.lang.SecurityException: cannot verify signature block file META-INF/CUST

The issue can be reproduced at will with the following steps:

1. Upgrade from 12.0.4 to 12.1.3
2. Open form
3. Form could not be opened and gets error in java

Due to this issue, users cannot open Forms.


Sign In with your My Oracle Support account

Don't have a My Oracle Support account? Click to get started

My Oracle Support provides customers with access to over a
Million Knowledge Articles and hundreds of Community platforms