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…
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.…