Question 1

The role of the Infrastructure layer

Accepted Answer

Implements the technical concerns.

Answer

Implements the business logic

Answer

All is correct

Answer

Orchestrates the business flow

Question 2

The role of the Application layer

Accepted Answer

Orchestrates the business flow

Answer

Implements the business logic

Answer

All is correct

Answer

Implements the technical concerns

Question 3

The role of the Domain layer

Accepted Answer

Implements the business logic

Answer

All are correct.

Answer

Implements the technical concerns

Answer

Orchestrates the business flow

Question 4

Communication is:

Accepted Answer

The Infrastructure layer can call itself to perform the relevant tasks.

Answer

All are wrong

Answer

The Domain layer can call any layers since it is the core business

Answer

The Application layer can call the Infrastructure layer because it orchestrates the workflow

Question 5

Which statement is correct

Accepted Answer

The Domain layer ensures the business invariants.

Answer

The Infrastructure layer should not call the Domain layer, it should implement the technical concerns only

Answer

The Infrastructure layer implementation should not change when the business evolves since it should be common enough to reuse.

Answer

The Application layer should be the place where we ensure the business rule since it knows which components can perform a specific task.

Question 6

Which statement is correct:

Accepted Answer

We can implement DDD without using Hexagonal architecture.

Answer

Dependency Inversion principle helps us focus on the development code.

Answer

Both are correct.

Answer

Both are wrong

Question 7

How to prevent NullPointerException?

Accepted Answer

All are correct

Answer

Do not pass null & return null

Answer

Wrap the nullable objects returned from external libraries into Optional structure.

Answer

Use the Empty Object pattern

Question 8

Given the code snippet below. Could you spot the problem?

Accepted Answer

Both are correct.

Answer

Both are wrong

Answer

Communication violation because we are directly using the persistence technology.

Answer

We should use dependency injection instead of static reference.

Question 9

Given the code snippet below. Could you spot the problem?

Accepted Answer

We should encapsulate the logic check inside the driver object.

Answer

The code looks fine to me.

Answer

There is no null check after retrieving the driver from the database.

Answer

We should declare the return type in the method signature & return an object error instead of throwing exception

Question 10

Given the code snippet below. Could you spot the problem

Accepted Answer

The code looks fine to me.

Answer

There is no null check after retrieving the driver from the database.

Answer

It’s better to show the business rule in this method.

Answer

We should have a better name for the command argument.

Question 11

Given the code snippet below. Could you spot the problem?

Accepted Answer

The Infrastructure layer should call the Application layer to perform the logic

Answer

The Infrastructure layer should not call the methods of the Driver class.

Answer

The Infrastructure layer should not depends on the DriverRepo class.

Answer

All are correct.

Question 12

Given the code snippet below. Could you spot the problem?

Accepted Answer

All are wrong.

Answer

There should be a custom serializer for the createdDt & updatedDt fields

Answer

There is no default constructor.

Answer

There should be @Column for the username field

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