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…
In Java, URISyntaxException is an exception that occurs when attempting to parse or create a URI (Uniform Resource Identifier) object, and the URI syntax is incorrect. A URI is a string that identifies a resource, such as a webpage, file, or database entry, in a unique manner. The URISyntaxException is a checked exception, which…
In Java, the CloneNotSupportedException is an exception thrown by the Object.clone() method to indicate that an object cannot be cloned. This exception typically occurs when a class does not implement the Cloneable interface, but an attempt is made to clone it. Understanding Cloneable Interface The Cloneable interface in Java is a marker interface, which…
What is IndexOutOfBoundsException? IndexOutOfBoundsException is a runtime exception that occurs in Java when you try to access an element from an array, ArrayList, or any other collection type using an index that is either negative or greater than or equal to the size of the collection. Causes of IndexOutOfBoundsException Accessing an Array Out of…
What is NumberFormatException? NumberFormatException is a subclass of RuntimeException in Java. It's thrown to indicate that the application has attempted to convert a string to one of the numeric types (such as Integer, Float, Double, etc.), but the string doesn't have the appropriate format. Causes of NumberFormatException Parsing Non-Numeric Characters: When trying to parse…
In Java, ClassNotFoundException is a checked exception that occurs when the Java Virtual Machine (JVM) tries to load a class dynamically using the Class.forName() method or by loading a class file using methods like ClassLoader.loadClass(), but the specified class is not found in the classpath. Causes of ClassNotFoundException: Incorrect Classpath Configuration: If the required…
In Java programming, the InterruptedException is a checked exception that can occur when a thread is interrupted by another thread while it's in a blocked state, typically waiting for an operation such as I/O, sleep, or waiting on a lock. This interruption mechanism allows threads to communicate with each other in a cooperative manner.…
IllegalStateException is a runtime exception that typically indicates that the current state of the application is not suitable for the operation being attempted. This exception is often thrown when a method is called inappropriately or at an unexpected time. It's part of the java.lang package and extends RuntimeException. Common Causes of IllegalStateException: Method Called…
A TimeoutException in Java occurs when a task or operation does not complete within a specified time frame. This exception is commonly used in concurrent programming, where multiple threads are executing concurrently, and you want to set a limit on how long a particular task should take. Let's dive into understanding TimeoutException with some…
In Java, an ArithmeticException is a runtime exception that occurs when an exceptional arithmetic condition has occurred. This often arises when an integer division by zero happens. In this tutorial, we'll cover the basics of ArithmeticException, common scenarios where it occurs, and how to handle it using examples. Table of Contents What is an…