IBM Senior Systems Engineer Interview Questions and Answers

API error codes are numerical or alphanumeric codes that indicate an error occurred during API usage.

• Error codes help developers identify and troubleshoot issues with API requests and responses.

• Common error codes include 400 Bad Request, 401 Unauthorized, 404 Not Found, and 500 Internal Server Error.

• API providers may also create custom error codes specific to their API.

• Error codes may be accompanied by error messa...read more

Functional interface defines a single abstract method while marker interface has no methods.

• Functional interface is used for lambda expressions and functional programming.

• Marker interface is used for adding metadata or tagging a class.

• Examples of marker interfaces are Serializable, Cloneable, and Remote.

• Examples of functional interfaces are Runnable, Comparator, and Callable.

Index and subscript are used to access elements in an array or list, but index refers to the position while subscript refers to the value.

• Index is the position of an element in an array or list, starting from 0.

• Subscript is the value used to access an element in an array or list.

• For example, in the array [1, 2, 3], the index of 2 is 1 and the subscript of 2 is 2.

• Index is an integer while subscript can be any data ...read more

I have worked on both Agile and Waterfall methodologies.

• I have experience in Agile methodologies such as Scrum and Kanban.

• I have also worked on Waterfall methodology in projects that require a more structured approach.

• I understand the strengths and weaknesses of both methodologies and can adapt to the project's needs.

• For example, I used Agile methodology in a project that required frequent changes and iterations, ...read more

React is a JavaScript library for building user interfaces.

• React uses a virtual DOM to efficiently update the UI.

• It allows for reusable components and declarative programming.

• React can be used with other libraries and frameworks.

• It uses JSX syntax to combine HTML and JavaScript.

• React is maintained by Facebook and has a large community of developers.

• Examples of companies using React include Netflix, Airbnb, and Dro...read more

Redux is a predictable state container for JavaScript apps.

• Redux helps manage the state of an application in a predictable way

• It provides a single source of truth for the state of the application

• Redux follows the principles of immutability and pure functions

• It allows for easy debugging and time-travel debugging

• Redux can be used with any UI library or framework

• Example: A shopping cart application can use Redux to m...read more

To register a sling servlet in AEM, you need to create a Java class that extends SlingAllMethodsServlet and annotate it with @SlingServlet. To call a workflow inside another workflow, you can use the WorkflowSession API. To call an OSGi service in another OSGi service class, you can use the @Reference annotation.

• Create a Java class that extends SlingAllMethodsServlet and annotate it with @SlingServlet to register ...read more

Multithreading in Java allows multiple threads to execute concurrently, improving performance and responsiveness.

• Multithreading in Java is achieved by extending the Thread class or implementing the Runnable interface.

• Threads share the same memory space, allowing them to communicate and synchronize using methods like wait(), notify(), and notifyAll().

• Java provides built-in support for multithreading with classes li...read more