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ClassNotFoundException vs NoClassDefFoundError Understanding the Key Differences
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In Java, ClassNotFoundException and NoClassDefFoundError are two common exceptions that occur when dealing with class loading and classpath issues. • ClassNotFoundException occurs when the JVM tries to load a class at runtime using the `Class.forName()` method or the `loadClass()` method of the `ClassLoader`, but the specified class cannot be found in the classpath. This usually happens when the class specified in the code is not available during runtime, either because it has been removed or because of a typo in the class name. • NoClassDefFoundError, on the other hand, occurs when the JVM attempts to load a class that was available during compilation but is not available during runtime. This can happen due to various reasons such as missing dependencies or changes in the classpath. • Here's a detailed breakdown of each exception: • 1. **ClassNotFoundException**: • This exception is a checked exception and must be caught or declared to be thrown. • It typically occurs when the class loader cannot find the class definition. • It is commonly encountered when using reflection to dynamically load classes at runtime. • 2. **NoClassDefFoundError**: • This exception is an unchecked error, which means it does not need to be declared in a method's throws clause or caught explicitly. • It usually occurs when a class that was present during compilation is missing during runtime. • Unlike ClassNotFoundException, which occurs during class loading, NoClassDefFoundError occurs when a class that was available during the compilation of the code is no longer available during runtime. • To handle these exceptions effectively: • Ensure that all required classes are available in the classpath during both compilation and runtime. • Double-check class names and package paths to avoid typos. • Check for any changes in dependencies or configurations that may have affected class loading. • Subscribe for more tutorials on Java exception handling and other programming topics! • ClassNotFoundException vs NoClassDefFoundError: Understanding the Key Differences | Java Exception handling • Java Source Code here: • http://ramj2ee.blogspot.com/2016/07/j... • Click the below link to download the code: • https://drive.google.com/file/d/1pGN6... • Github Link: • https://github.com/ramram43210/Java/t... • Bitbucket Link: • https://bitbucket.org/ramram43210/jav... • #Java,#JavaException,#JavaTutorial,#JavaBasics,#Exceptioninjava,#Exception,#Javacheckedexception,#checkedexceptioninjava,#checkedexception,#javauncheckedexception,#uncheckedexceptioninjava,#uncheckedexception
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