In the world of reactive programming, where asynchronous and non-blocking operations reign supreme, Spring Boot provides powerful tools to handle such scenarios effectively. Among these tools are Mono and Flux, two fundamental classes provided by the Reactor library, which is integrated into Spring Boot. What are Mono and Flux? Mono: Mono is a container…
What is MalformedURLException? MalformedURLException is a subclass of IOException that signals that a malformed URL has occurred. This exception is thrown when a string that is supposed to represent a URL is not properly formatted. When does MalformedURLException occur? Invalid URL Syntax: This exception occurs when a string passed to a URL constructor or…
The UnsupportedOperationException is a common exception in Java that indicates an operation is not supported. This exception is typically thrown to indicate that the operation is not available or not implemented in the current context. When is UnsupportedOperationException Thrown? This exception is typically thrown in the following scenarios: Unsupported Operations: When an operation is…
FileNotFoundException is a type of IOException that occurs when a file is requested from the file system, but the file with the specified pathname does not exist. This exception is thrown by various methods in the java.io package when an attempt to open a file for reading, writing, or other operations fails because the…
InstantiationException is a type of exception in Java that occurs when you try to instantiate an abstract class or an interface using the new keyword, or when the instantiation of a class fails for some other reason. This exception is a subclass of ReflectiveOperationException. When does InstantiationException occur? Instantiating Abstract Classes or Interfaces: Abstract…
InvocationTargetException is a checked exception that is a subclass of ReflectiveOperationException. It typically occurs when you are using Java Reflection API to invoke a method or constructor, and that method or constructor throws an exception. This exception wraps the original exception thrown by the invoked method or constructor. Causes of InvocationTargetException Checked Exceptions Thrown…
In Java programming, NoSuchFieldException is an exception that occurs when code tries to access a field (i.e., a variable) of a class using reflection, but the specified field does not exist within that class. This exception is a part of the java.lang package and is a subclass of ReflectiveOperationException. This tutorial will cover the…
What is SecurityException? SecurityException is a type of unchecked exception that indicates a security violation. It typically occurs when attempting to perform an operation that violates the security constraints enforced by the Java Runtime Environment (JRE). These violations often involve sensitive operations such as accessing restricted system resources, modifying security-sensitive information, or executing privileged…
SQLException is a class in Java that represents an exception thrown when there is an error in accessing the database or executing a SQL query. It is a checked exception, which means the code that handles the SQLException must either catch it or declare it in the method signature using the throws clause. Common…
The NullPointerException (NPE) is one of the most common exceptions encountered by Java developers. It occurs when your code attempts to use an object reference that has not been initialized (i.e., it points to null). This tutorial will help you understand what causes an NPE, how to identify and fix it, and best practices…