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Why does java runtime throw classnotfoundexception at runtime?


Asked by Talia Barker on Dec 15, 2021 Java



While both of these exceptions are related to classpath and Java runtime unable to find a class at run time, it's important to note their differences. Java runtime throws ClassNotFoundException while trying to load a class at runtime only and the name was provided during runtime.
Just so,
ClassNotFoundException is a checked runtime exception that occurs when a program tries to load a class at runtime using its specified name, but its definition cannot be found in the classpath. Any of these following methods can be used to load the class, Class.forName () method from class Class loadClass () method from class ClassLoader
In this manner, If you remove the A.class file and run the B.class file, Java Runtime System will throw NoClassDefFoundError like below: It is an exception. It is of type java.lang.Exception. It is an error. It is of type java.lang.Error. It occurs when an application tries to load a class at run time which is not updated in the classpath.
Subsequently,
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.
Consequently,
FileNotFoundException is a checked exception in Java. Anytime, we want to read a file from filesystem, Java forces us to handle error situation where file may not be present in place. In above case, you will get compile time error with message – Unhandled exception type FileNotFoundException. Click to see full answer