Web Reference: Sep 9, 2016 · When you get a ClassNotFoundException, it means the JVM has traversed the entire classpath and not found the class you've attempted to reference. The solution, as so often in the Java world, is to check your classpath. Jul 23, 2025 · In Java, java.lang.ClassNotFoundException is a checked exception and occurs when the Java Virtual Machine (JVM) tries to load a particular class and the specified class cannot be found in the classpath. ClassNotFoundException should be handled with a try-catch block or using the throw keyword. Constructs a ClassNotFoundException with the specified detail message and optional exception that was raised while loading the class. Returns the cause of this exception (the exception that was raised if an error occurred while attempting to load the class; otherwise null).
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