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Login database error handling

Hello,
I am using JDev Studio Edition Version 12.2.1.4.0
I have been researching how to catch a database connection error and most say creating a custom class that extends DCErrorHandlerImpl with an override to reportException() is a good way to catch this.
However, I can't get this to work. I included the path in DataBindings.cpx ErrorHandlerClass attribute. I basically want to do error handling when the application can't get a db connection. For example, if the pool size is 1 and I try to access the app, is there a way to catch this exception in code? I can't get the reportException() function to be called when there is an exception for this.
Any help would be great, thanks.
Answers
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There was an excellent article in an old Oracle Magazine that described the different layers and their exception handlers. This article is no longer available :(
However, the code can still be downloaded at https://github.com/tompeez/Old_Sample_Code/raw/main/o23adf-1896561.zip.
I only have a link to https://dokumen.tips/download/link/oracle-adf-architecture-tv-development-error-handling showing the content of the article. Or you look at https://www.oracle.com/application-development/technologies/adf/architecturesquare.html#tv and search the site for 'Error Handling. This will give you 4 videos about the content of the article.
Timo