ClassNotFoundException is a checked exception in Java indicating that the class cannot be found in the specified classpath, often due to configuration issues.
To resolve ClassNotFoundException, ensure the correct classpath is set, the class name is accurate, and dependencies are properly configured in build tools.
NoClassDefFoundError occurs when a class that was available during compilation is not found in the classpath at runtime, which can cause application failures.
Common causes of NoClassDefFoundError include missing class files at runtime and various class loading issues that prevent the JVM from accessing the required classes.
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