An unexpected error has been detected by HotSpot Virtual Machine in Oracle Reports

Today while I was working on one of RDF report used in Oracle Applications, I face this problem and I was clueless what to do. I searched on the internet with error message and it was saying some thing which is not at all related to report. The error message reflect some issue with the server configs.

Since same reports works fine for some of the order then I realized some thing must be wrong in my report only.

How To Show / Hide Diagnostics Menu Entry

At last moment you got a requirement to disable a particular field on a form. As you tried to navigate to access forms personalization what you see is 

There is no 'Diagnostics' option to navigate to Help -> Diagnostics.

Well the Diagnostics menu entry is controlled by profile option "Hide Diagnostics menu entry"

How To Enable / Disable Forms Personalization Option

Forms Personalization gives great flexibility to execute custom business logic without performing so much of technical work.

To start forms personalization navigate to Help -> Diagnostics -> Custom Code -> Personalize

But many time when we click on personalize it give below error 

"Function is not available for this respnosibility. Change

responsibilities or contact your System Administrator"

To Enable access to forms personalization function we need to set below profile option.
 - Utilities:Diagnostics -> Yes / No
It determines the diagnostics option is enabled for a user / responsibility or site, depending on the level profile option is set.