java.lang.ClassNotFoundException:

java.lang.ClassNotFoundException is a runtime exception that occurs when the Java Virtual Machine (JVM) tries to load a class at runtime and cannot find the class in the classpath. This means that the class is either missing or not available in the classpath. There are several reasons for why this exception can occur, such as:

- The class is not present in the classpath or it has been removed.
- The classpath is not set correctly.
- The class is located in a different package and the package name is not specified correctly.
- The class is located in a different module or jar file that is not included in the classpath.
- The class is not compiled or packaged correctly.

To resolve this exception, you need to ensure that the class is available in the classpath and that the classpath is set correctly. You may also need to check the package name and ensure that the class is compiled and packaged correctly.