Skip to main content

ClassNotFoundException vs NoClassDefFoundError

Both ClassNotFoundException and NoClassDefFoundError errors will be occurred  when the required Class not present in the Class path.
   
ClassNotFoundException
   
ClassNotFoundException is an Exception got arized when trying load class using
forName() method in class Class.
findSystemClass method in class ClassLoader .
loadClass method in class ClassLoader.

e.g. Class.forName("oracle.jdbc.driver.OracleDriver")
if the OracleDriver class file is not present in the Class path, then we will end up with this ClassNotFounException

NoClassDefFoundError

NoClassDefFoundError is an Error thrown at Runtime, when the Class is present during the compile time and not present during Runtime of the Code, then we will end up with this NoClassDefFoundError.

1. When required Class is not available at Runtime available only in compile time.
2.Since NoClassDefFoundError error is an Subclass of LinkageError, it will occur when one of the     Dependent of the jar not present in class path.
3. When the Static initialization of Class failed then it triggers java.lang.ExceptionInInitializerError
 which also leads to this Error.

e.g.  Exception in thread "main" java.lang.NoClassDefFoundError

Comments

Popular posts from this blog

Self Signed Certificates Vs Signed Certificates (CA Certificates)

Certificates Certificates basically two categories. Self Signed Certificates  - will create by self CA Certificates  - will be  provided by Third party vendor with robust algorithms Depends on the location of installing the certificate these are two types 1. Public Key Certificates (Client Side) 2. Private Key Certificates (Server Side) Self Signed Certificates   If any one is using self signed certificates in their applications they have to make sure both server side and client side certificates are in sync. Other wise we should be ready to face SSLHandShake Exceptions. These will be preferable mostly for lower environments not for production. CA certificates  If you install CA certificates on server side, client side certificates are installed automatically whenever they access the server. So in production for CA certificates there is no need to install the client side certificates. We can generate a Self Signed Certificate using Java Key tool JAVA_HOME/bi...

Spring Reactive Stack

Finding Second Highest element in an Array

package com.sbs.java8.praticse; public class SecondHightestClass { public static void main(String[] args) { final Integer[] intArray = { 10, 2, 36, 7, 29, 30, 100, 20, 90, 83, 87 }; final int n = intArray.length; int sortPointer = intArray.length; for (int m = n; m > (n - sortPointer); m--) { for (int i = 0; i < n - 1; i++) { int j = i + 1; if (intArray[i] > intArray[j]) { int temp = intArray[i]; intArray[i] = intArray[j]; intArray[j] = temp; } } sortPointer--; } System.out.println(intArray[n - 2]); } }