Mantra Technologies Junior Java Developer Interview Questions and Answers

2 Basic Programsl on LRU amd strings

Q1. Core java , java 8 concepts, spring core concepts
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Q1. Salary discussion
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Q1. Policy briefing
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Q1. Questions on method overloading and overriding topics also some annotations on spring and sprungboot
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Print the even count digits of number in to two parts

Q1. Technical questions from basic to API in springboot
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Q1. Principal of garbage collection
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Garbage collection is an automatic memory management process that frees up memory occupied by objects that are no longer in use.
• Garbage collection is performed by the JVM.

• It helps prevent memory leaks and improves application performance.

• There are different types of garbage collectors such as serial, parallel, CMS, and G1.

• Garbage collection can cause pauses in the application, which can be minimized by tuning the JVM p...read more
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Q2. Micro services design pattern
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Microservices design pattern is an architectural approach to building software applications as a collection of small, independent services.
• Microservices are independently deployable and scalable

• Each microservice focuses on a specific business capability

• Communication between microservices is done through APIs

• Microservices can be developed using different programming languages and technologies

• Examples of companies using
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Q3. Spring bòot annotations
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Q4. Sessions in hibernate
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Sessions in Hibernate are used to manage the interaction between the application and the database.
• A session is a single-threaded object that represents a connection between the application and the database.

• It is responsible for managing the persistence of objects, executing queries, and providing transactional support.

• A session can be obtained from a session factory and should be closed when no longer needed.

• Example: S...read more
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Q5. What is Hash collusion
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Hash collusion is when two different inputs produce the same hash value.
• It is a security vulnerability in hash functions.

• Attackers can exploit this vulnerability to create a collision attack.

• For example, an attacker can create a malicious file with the same hash value as a legitimate file to bypass security checks.
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Q6. What is saga design pattern
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Saga design pattern is used to manage long-lived transactions between microservices.
• It ensures that all services involved in a transaction are either committed or rolled back together.

• It uses a sequence of local transactions to achieve global consistency.

• It can be implemented using either choreography or orchestration.

• Example: A customer places an order, which involves multiple microservices such as inventory, payment,...read more
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