Difference NoClassDefFoundException and ClassNotFoundException

-
NoClassDefFoundException occurs when class is loaded as statically and ClassNotFoundException occurs when class is loaded as dynamically.

Static class loading:-

Car c = new TestClass();

Dynamically class loading:-
Class.forName(“TestClass”);


According to arun:-

Consider, you have two custom classloaders - CL1 and CL2. A class loaded by CL1 when tried to be accessed by CL2 will also throw a ClassNotFoundException.

And consider you have Class1 loaded by both CL1 and CL2, they both are not compatible even through they are the same. There we give some job to ClassCastException.

Thanks
Arun
www.arunma.com

Comments

Post a Comment

Recent Post

Recent Posts Widget

Popular posts from this blog

Capture image from webcam java code, examples

-
import java.applet.Applet; import java.awt.BorderLayout; import java.awt.Component; import java.awt.Dimension; import java.awt.Frame; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.Image; import java.awt.Panel; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import java.awt.image.BufferedImage; import java.io.FileOutputStream; import java.net.MalformedURLException; import java.net.URL; import javax.media.Buffer; import javax.media.CaptureDeviceInfo; import javax.media.CaptureDeviceManager; import javax.media.Manager; import javax.media.MediaLocator; import javax.media.Player; import javax.media.control.FrameGrabbingControl; import javax.media.format.VideoFormat; import javax.media.util.BufferToImage; import javax.swing.JButton; import javax.swing.JComponent; import com.sun.image.codec.jpeg.JPEGCodec; import com.sun.image.codec.jpeg.JPEGE...
Read more

How to capture finger prints in java

-
Java code for capture finger prints. NBioBSPJNI.FIR_HANDLE hSavedFIR; hSavedFIR = bsp.new FIR_HANDLE(); bsp.Enroll(hSavedFIR, null); // Enroll bsp.Capture(hSavedFIR); // Capture // Get Text FIR if (bsp.IsErrorOccured() == false) { NBioBSPJNI.FIR_TEXTENCODE textSavedFIR; textSavedFIR = bsp.new FIR_TEXTENCODE(); bsp.GetTextFIRFromHandle(hSavedFIR, textSavedFIR); } // Get Binary FIR if (bsp.IsErrorOccured() == false) { NBioBSPJNI.FIR fullSavedFIR; fullSavedFIR = bsp.new FIR(); bsp.GetFIRFromHandle(hSavedFIR, fullSavedFIR); } You can capture both type in your database and file. 1)textFIR 2)BinaryFIR
Read more

Shallow Copy Deep Copy Java example

-
Shallow Copy Deep Copy  Java example Before knowing about Shallow Copy and Deep Copy you need to know about Clonable interface. Clonable interface -     Java has a clonable interface for make clone of any object.     Clonable Interface is a marker interface.     Clonable Interface has no method.     Class which implements Clonable interface, JVM give the permission for making the clone of         this class. Shallow Copy -              Clone can be archived by object.clone() method. It gives the Shallow copy of the object. In this process a new object is created That have all the value and instance variable. And if main object has any references to other object then the references are copied in the shallow copy. Example - class A implements Cloneable{         A(String personName, Integer age){  ...
Read more