Carelan Interview Questions, Process, and Tips

Q1. How will you create a Jar/war file
Ans. 
To create a Jar/war file, use the jar command in the terminal or an IDE like Eclipse.
• Use the jar command in the terminal to create a Jar file: jar cf jarFileName.jar file1 file2

• Use the jar command with 'war' option to create a War file: jar cf warFileName.war file1 file2

• In Eclipse, right-click on the project, go to Export > JAR file/WAR file, and follow the prompts
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Q2. How will you debug the code
Ans. 
I will use logging, debugging tools like breakpoints, and analyzing stack traces to identify and fix issues in the code.
• Use logging statements to track the flow of the code and identify any unexpected behavior.

• Set breakpoints in the code to pause execution at specific points and inspect variables and data.

• Analyze stack traces to understand the sequence of method calls leading to an error.

• Use debugging tools like Eclips...read more
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Q3. For example if you want to take the thread dump of java process - use jps command to find the java processes and their pids. Run the jstack command with the pid of the java process - jstack
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Q4. How will you replace a value in hashmap
Ans. 
Use the put() method to replace a value in a HashMap.
• Use the put() method with the key of the value you want to replace

• Example: map.put(key, newValue);
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Q5. How will you organize if Employee class has many department in it (Hibernate)
Ans. Add @entity annotation to the Employee class and then add @oneToMany annotation to the department instance in the employee class
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Q6. How the front end communicates with the backend in Spring
Ans. 
Front end communicates with the backend in Spring through HTTP requests using RESTful APIs.
• Front end sends HTTP requests to the backend server

• Backend server processes the requests and sends back HTTP responses

• Communication is typically done using RESTful APIs in Spring MVC

• Data is exchanged in JSON format between front end and backend
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Q7. How will you fetch a value from the application.proprties file in spring boot
Ans. 
To fetch a value from application.properties file in Spring Boot, use @Value annotation or Environment object.
• Use @Value annotation to inject values directly into a field

• Use Environment object to access properties programmatically

• Example: @Value("${my.property}") private String myProperty;

• Example: @Autowired private Environment env; String propertyValue = env.getProperty("my.property");
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Q8. Name few annotations in springboot
Ans. 
Some annotations in Spring Boot are @RestController, @Autowired, @Component, @RequestMapping, @Service.
• @RestController - used to define RESTful web services.

• @Autowired - used for automatic dependency injection.

• @Component - marks a java class as a bean so that the component-scanning mechanism of Spring can pick it up and pull it into the application context.

• @RequestMapping - used to map web requests to specific handler ...read more
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Q9. How will change the data type of a column in sql
Ans. 
You can change the data type of a column in SQL using the ALTER TABLE statement.
• Use the ALTER TABLE statement followed by the MODIFY COLUMN clause to change the data type of a column.

• Specify the new data type for the column after the MODIFY COLUMN clause.

• Make sure to handle any data conversion or potential data loss when changing the data type.
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Q10. How will you pull the pids of the java process
Ans. 
You can pull the pids of Java processes using command line tools like jps or ps.
• Use 'jps' command to list Java processes along with their pids.

• Use 'ps -ef | grep java' command to list all processes with 'java' in their name and find the pid.

• You can also use tools like VisualVM or JConsole to monitor and manage Java processes.
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Q11. How will you reduce the heap memory
Ans. 
To reduce heap memory usage in Java, you can optimize code, limit object creation, use data structures efficiently, and tune JVM settings.
• Optimize code by avoiding unnecessary object creation and using efficient algorithms

• Limit object creation by reusing objects, using object pooling, or implementing flyweight design pattern

• Use data structures efficiently by choosing the right data structure for the task at hand

• Tune JV...read more
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Q12. Whah happens when we do mvn clean install
Ans. 
mvn clean install is a Maven command used to clean the project, compile the source code, run tests, and package the application.
• Removes target directory to clean project

• Compiles the source code

• Runs tests

• Packages the application

• Dependencies are downloaded if needed
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60 minutes, Java, Structure and basics

60 minutes, java, structure and basics

Q1. Technical questions
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Q2. What is workday
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Q3. What is hire and rehire
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Q4. How to handle challenges
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Q1. What is last drawn salary
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Q1. Tell me about your self
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Q1. Selfintroduction
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Q2. About healthcare claims
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