JAVA EE: Java Tutorial : Java Exception handling (ClassNotFoundException vs NoClassDefFoundError)

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Java Tutorial : Java Exception handling (ClassNotFoundException vs NoClassDefFoundError)

ClassNotFoundExceptionDemo.java

public class ClassNotFoundExceptionDemo
{

    public static void main(String[] args)
    {

        try
        {
            Class.forName("oracle.jdbc.driver.OracleDriver");
        }
        catch (ClassNotFoundException e)
        {
            e.printStackTrace();
        }

    }

}

Output

java.lang.ClassNotFoundException: oracle.jdbc.driver.OracleDriver
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:264)
    at ClassNotFoundExceptionDemo.main(ClassNotFoundExceptionDemo.java:9)

B.java

class A
{
    
}

public class B
{

    public static void main(String[] args)
    {
        A a=new A();
    }

}

Output

Exception in thread "main" java.lang.NoClassDefFoundError: A
    at B.main(B.java:11)
Caused by: java.lang.ClassNotFoundException: A
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 1 more