Web Reference: I have created and published my first Android app. It's very simple. It works fine on simulator and some phones, but I am getting this error: java.lang.RuntimeException: Unable to instantiate ClassNotFoundException (String s, Throwable ex) Constructs a ClassNotFoundException with the specified detail message and optional exception that was raised while loading the class. 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.
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