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. You define a classpath on the command line by saying java -cp and then 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. Dec 22, 2025 · The java.lang.ClassNotFoundException: org.apache.commons.codec.binary.Base64 error is a common but easily fixable issue in Java Servlets. It boils down to ensuring the Apache Commons Codec library is present in your application’s runtime classpath.
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