Persistent Systems Java Developer Interview Questions, Process, and Tips

Explaining request mapping annotation syntax and usage in Java development

• RequestMapping annotation is used to map HTTP requests to specific methods in a controller class

• It can be used to specify the URL path, HTTP method, request parameters, headers, and more

• Example: @RequestMapping(value = '/users', method = RequestMethod.GET)

• This maps a GET request to the '/users' URL path

Multithreading synchronization and exception handling in Java.

• Synchronization can be achieved using synchronized keyword, locks, and semaphores.

• Exceptions can be handled using try-catch blocks, finally block, and throwing exceptions.

• Deadlock can be avoided by acquiring locks in a consistent order.

• Thread safety can be ensured by using immutable objects and thread-safe collections.

• Examples of thread-safe collections are

Explanation of synchronised keyword, join method, and exceptional handlers in controller advice.

• Synchronized keyword is used to ensure that only one thread can access a block of code at a time.

• Join method is used to wait for a thread to complete its execution before moving on to the next thread.

• Exceptional handlers in controller advice are used to handle exceptions that occur during the execution of a controller method...read more