Defining and Working with Exception Classes

Question 1

How do you handle errors in ABAP?

Answer 1

Errors in ABAP are typically handled using the TRY, CATCH, and ENDTRY statements. Within a TRY block, you place the statements that might cause an error. If an error occurs, the system jumps to the corresponding CATCH block to process the error.

Question 2

What is the sequence of CATCH statements in ABAP error handling?

Answer 2

In ABAP error handling, CATCH statements must be arranged in a specific sequence. The most specific exception classes should be listed first, followed by more generic ones. Placing a superclass above its subclass will result in a syntax error.

Question 3

What is the purpose of the INTO addition in a CATCH statement?

Answer 3

The INTO addition in a CATCH statement allows you to capture the exception object into a reference variable. This enables you to work with the exception object, such as retrieving the error text using the get_text() method.

Question 4

What is the “Previous” attribute in ABAP exception classes?

Answer 4

The “Previous” attribute in ABAP exception classes allows a method to pass on a previous exception while raising a new one. This can be useful in scenarios where a method catches an exception and raises a different one for its caller to handle. The “Previous” attribute allows the caller to access the original exception object.

Question 5

What is the purpose of defining your own exception classes in ABAP?

Answer 5

Defining your own exception classes allows you to create exceptions that reflect the semantics of your application. While predefined system exception classes describe technical errors, custom exception classes can be tailored to specific scenarios or business logic within your application.

Question 6

How do you define a custom exception class in ABAP?

Answer 6

To define a custom exception class in ABAP, you create a new class that inherits from the class cx_static_check. This inheritance ensures that your custom exception class inherits the necessary behavior and properties for handling exceptions.

Question 7

What are some advantages of using custom exception classes

Answer 7

By defining exceptions that are tailored to specific scenarios or business logic, developers can provide more meaningful error messages and enhance the overall maintainability and readability of the codebase. Additionally, custom exception classes can help differentiate between different types of errors and streamline the debugging process.

Question 8

You have a superclass super that has three subclasses sub1, sub2, and sub3. In a TRY…CATCH block, you want to catch sub1explicitly and sub2 and sub3 via their superclass. You also want to catch any other exceptions using cx_root. What is the correct sequence of CATCH statements?

A
CATCH cx_root. CATCH sub1. CATCH super.

B
CATCH sub1. CATCH super. CATCH cx_root.

C
CATCH cx_root. CATCH super. CATCH sub1.

D
CATCH super. CATCH sub1. CATCH cx_root.

Answer 8

B
CATCH sub1. CATCH super. CATCH cx_root.

The most important and explicit cases come first, generic ones later.

Question 9

Where do you create translatable texts for your exception classes?

A
As a constant in the class definition

B
As a message in a message class

C
As a text element in the text pool of the class

Answer 9

B
As a message in a message class