Java Support Engineer

Java Support Engineer Interview Questions and Answers

Updated 7 Jul 2025

Asked in Carelan

5d ago

Q. How do you fetch a value from the application.properties 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");

Asked in Carelan

3d ago

Q. How do you 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.

Asked in Carelan

1d ago

Q. How does the front end communicate 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

Asked in Carelan

2d ago

Q. How do you retrieve the PIDs of Java processes?

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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Asked in Carelan

3d ago

Q. What happens when we run '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

Asked in Carelan

2d ago

Q. How do 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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Asked in Carelan

5d ago

Q. How do you replace a value in a 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);

Asked in Carelan

6d ago

Q. How would you reduce heap memory usage?

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 JVM settings such as heap size, garbage collection algorithm...read more

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Asked in Carelan

5d ago

Q. How would you debug 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 Eclipse Debugger or IntelliJ IDEA Debugger to step through the c...read more

Asked in Carelan

5d ago

Q. Name a few annotations in Spring Boot.

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 classes or methods.

  • @Service - used to indicate that a clas...read more

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