Tech Mahindra Lead Engineer Interview Questions and Answers

Q1. What is the architecture of the Java Virtual Machine (JVM)?
Ans. 
The Java Virtual Machine (JVM) is an abstract computing machine that enables a computer to run Java programs.
• JVM is platform-independent and converts Java bytecode into machine code.

• It consists of class loader, runtime data areas, execution engine, and native method interface.

• JVM memory is divided into method area, heap, stack, and PC register.

• Examples of JVM implementations include Oracle HotSpot, OpenJ9, and GraalVM.
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Q2. What is the default connection pooling in Spring Boot, and how can it be customized?
Ans. 
The default connection pooling in Spring Boot is HikariCP, which can be customized through properties in the application.properties file.
• HikariCP is the default connection pooling library in Spring Boot, known for its high performance and low overhead.

• To customize the connection pooling, you can modify properties like 'spring.datasource.hikari.*' in the application.properties file.

• For example, you can set maximum pool ...read more
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Q3. What are the best practices for optimizing a Spring Boot application?
Ans. 
Best practices for optimizing a Spring Boot application
• Use Spring Boot Actuator to monitor and manage application performance

• Implement caching mechanisms like Spring Cache to reduce database calls

• Optimize database queries and indexes for better performance

• Use asynchronous processing with Spring's @Async annotation for non-blocking operations

• Profile and analyze application performance using tools like VisualVM or JProfi
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Q4. What is a heap dump, and how can it be used to identify memory leaks?
Ans. 
A heap dump is a snapshot of the memory usage of a Java application at a specific point in time.
• Heap dumps can be generated using tools like jmap or VisualVM.

• They provide detailed information about objects in memory, their sizes, and references.

• Analyzing a heap dump can help identify memory leaks by pinpointing objects that are consuming excessive memory.

• Common signs of memory leaks in a heap dump include a large numbe...read more
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Q5. How can you diagonally iterate through and print the elements of a 2D array?program
Ans. 
Diagonally iterate through and print elements of a 2D array of strings.
• Use nested loops to iterate through rows and columns of the 2D array.

• Calculate the diagonal elements by incrementing row and column indices together.

• Print the elements as you iterate through the diagonal of the array.
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Q1. Questions on core java concepts
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Q2. Questions on SQL and Springboot
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Q1. Questions on Collection framework.
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Q2. Questions on Springboot and core java
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Q1. Scenario based question
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Q2. Stream API questions
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Q1. Microservices, java questions
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Q1. About your self
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Q2. About work experience
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Q1. Expected ctc lpa
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Q2. Notice period of it less than 90 or not
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Q1. Spring boot questiions
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Q2. Java stream api coding
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Basic questions for aptitude genearal personl developing questions

Q1. What is react native
Ans. 
React Native is a framework for building mobile applications using JavaScript and React.
• Allows developers to write code once and deploy it across multiple platforms

• Provides access to native features and APIs of the device

• Supports hot reloading for faster development

• Used by companies like Facebook, Instagram, and Airbnb
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Q2. Diff use memo and use reducer
Ans. 
Memo is used for optimizing performance by caching the result of a function, while reducer is used for managing state in React applications.
• Memo is used to memoize the result of a function and prevent unnecessary re-renders.

• Reducer is used to manage state in React applications by updating the state based on actions.

• Memo can be used with useMemo hook in React to optimize performance.

• Reducer is typically used with useRed...read more
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Q1. Salary discussion
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Q2. Notice period about compnay
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30min online test. Easy level.

Q1. Technical interview with core concepts
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Q2. Conceptual , core knowledge.
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Q1. Managereal round
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Q1. Explain your skills
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Q2. Java phut hon spring boot
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