ClassNotFoundException is thrown when an application tries to load in a class through its string name using:
The forName method in class Class.
The findSystemClass method in class ClassLoader .
The loadClass method in class ClassLoader.
http://docs.oracle.com/javase/1.4.2/docs/api/java/lang/ClassNotFoundException.html
Example:
package hardik4u;
public class ExpClassNotFound {
public static void main(String[] args) {
//i have tried to load class which is not exists using Class.forName
try {
Class.forName("hardik4u.TestDate");
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
while
NoClassDefFoundError is thrown if the Java Virtual Machine or a ClassLoader instance tries to load in the definition of a class (as part of a normal method call or as part of creating a new instance using the new expression) and no definition of the class could be found.
The searched-for class definition existed when the currently executing class was compiled, but the definition can no longer be found.
http://docs.oracle.com/javase/1.4.2/docs/api/java/lang/NoClassDefFoundError.html
Example:
package hardik4u;
public class ExpClassDefNotFound {
/**
* @param args
*/
public static void main(String[] args) {
// Create one Class TestData in the same package
// compile TestData and add below line in ExpClassDefNotFound class and compile it.
// remove TestData.class and run
// Java ExpClassDefNotFound
// it will give ClassDefNot Found Error
TestData testData =new TestData();
}
}
