0045138: Add support for @NonNull and @Nullable annotations

Description

See https://help.eclipse.org/2020-09/index.jsp?topic=%2Forg.eclipse.jdt.doc.user%2Ftasks%2Ftask-using_null_annotations.htm [^]

Ideally we should use the Mandatory flag in AD_Column to automatically set as @NonNull/@Nullable the return object in the getters() and the parameter in the setters() of any class generated from the AD_Table definition.

Other manually generated classes could use both annotations too.

The usage of these annotations could help to detect NullPointerException easily at compilation time.

Steps To Reproduce

Write a code that uses a method where null might be returned. Example:

invoice.getDescription().concat("Expected NPE if description is null");

It would be nice that the eclipse compiler showing a warning to the developer.

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Notes
(0123364) vmromanos (manager) 2020-09-25 08:23	See java 8 annotations as another option to implement the same thing https://help.eclipse.org/2020-09/index.jsp?topic=%2Forg.eclipse.jdt.doc.user%2Ftasks%2Ftask-using_null_type_annotations.htm [^]

Issue History
Date Modified	Username	Field	Change
2020-09-25 08:14	vmromanos	New Issue
2020-09-25 08:14	vmromanos	Assigned To	=> platform
2020-09-25 08:14	vmromanos	Modules	=> Core
2020-09-25 08:14	vmromanos	Triggers an Emergency Pack	=> No
2020-09-25 08:23	vmromanos	Note Added: 0123364
2022-02-01 08:07	alostale	Assigned To	platform => Triage Platform Base