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1. What is the difference between NoClassDefFoundError and ClassNotFoundException?
I want to know the difference between the specified error and the exception. What is the reason for getting each of them and any thought process on how to deal with such errors? While working on a project. If we are modifying the existing code to include the new jar file I get to face these exceptions. Sometimes they will come in client side or server side for a java app distributed through w...
2. How is import done in Java?
For instance import org.apache.nutch.plugin.Extension, though used many times, I've no much idea what is done essentially. EDIT: Is org.apache.nutch.plugin essentially 4 directories or fewer than 4 like a directory named org.apache?
3. Cannot run a simple java code
I have downloaded a java developers kit for my 64bit windows 7, wrote down my code in the notepad, though the code is compiling from the command prompt and creating a .class file, but its refusing to run showing the error code: java.lang.NoClassDefFoundError: first Caused by: java.lang.ClassNotFoundException: first at java.net.URLClassLoader$1.run(Unknown Source) at java.security.Acc...
4. Exception other than RuntimeException
Is there any possibility of exceptions to occur other than RuntimeException in Java? Thanks.
5. Please help me to understand ClassNotFoundException and NoClassDefFoundError
Can someone help me to understand ClassNotFoundException and NoClassDefFoundError (with a good example for NoClassDefFoundError)?
6. GWT Autobeans / NoClassDefFoundError: What am I doing wrong?
I am trying to serialize a POJO to JSON in GWT using Autobeans, an I keep receiving a NoClassDefFoundError and ClassNotFoundException, both looking for org.json.JSONObject. This is in the context of tokenizing a Place. I created a JUnit test to isolate the problem. The test is: @Test public void testGetToken() { SearchCriterion searchCriterion = new JavaSearchCriterion("a", "b", Immutable...
7. Problem in configuration project using struts + tiles + maven
Here is my config in web.xml <context-param> <param-name> org.apache.tiles.impl.BasicTilesContainer.DEFINITIONS_CONFIG</param-name> <param-value>/WEB-INF/tiles.xml</param-value> </context-param> <listener> <listener-class>org.apache.struts2.tiles.StrutsTilesListener</listener-class> </list... 
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  /*
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   * Copyright 1995-2004 Sun Microsystems, Inc.  All Rights Reserved.
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   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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   *
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   * This code is free software; you can redistribute it and/or modify it
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   * under the terms of the GNU General Public License version 2 only, as
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   * published by the Free Software Foundation.  Sun designates this
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   * particular file as subject to the "Classpath" exception as provided
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   * by Sun in the LICENSE file that accompanied this code.
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  *
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  * This code is distributed in the hope that it will be useful, but WITHOUT
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  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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  * version 2 for more details (a copy is included in the LICENSE file that
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  * accompanied this code).
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  *
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  * You should have received a copy of the GNU General Public License version
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  * 2 along with this work; if not, write to the Free Software Foundation,
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  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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  *
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  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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  * CA 95054 USA or visit www.sun.com if you need additional information or
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  * have any questions.
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  */
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 package java.lang;

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.

but no definition for the class with the specified name could be found.

As of release 1.4, this exception has been retrofitted to conform to the general purpose exception-chaining mechanism. The "optional exception that was raised while loading the class" that may be provided at construction time and accessed via the getException() method is now known as the cause, and may be accessed via the Throwable.getCause() method, as well as the aforementioned "legacy method."

Author(s):
unascribed
Since:
JDK1.0
See also:
Class.forName(java.lang.String)
ClassLoader.findSystemClass(java.lang.String)
ClassLoader.loadClass(java.lang.String,boolean)
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 public class ClassNotFoundException extends Exception {
    
use serialVersionUID from JDK 1.1.X for interoperability 
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      private static final long serialVersionUID = 9176873029745254542L;

    
This field holds the exception ex if the ClassNotFoundException(String s, Throwable ex) constructor was used to instantiate the object

Since:
1.2
Serial:
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     private Throwable ex;

    
Constructs a ClassNotFoundException with no detail message. 
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     public ClassNotFoundException() {
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         super((Throwable)null);  // Disallow initCause
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     }

    
Constructs a ClassNotFoundException with the specified detail message.

Parameters:
s the detail message.
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     public ClassNotFoundException(String s) {
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         super(s, null);  //  Disallow initCause
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     }

    
Constructs a ClassNotFoundException with the specified detail message and optional exception that was raised while loading the class.

Parameters:
s the detail message
ex the exception that was raised while loading the class
Since:
1.2
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     public ClassNotFoundException(String s, Throwable ex) {
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         super(s, null);  //  Disallow initCause
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         this. = ex;
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     }

    
Returns the exception that was raised if an error occurred while attempting to load the class. Otherwise, returns null.

This method predates the general-purpose exception chaining facility. The Throwable.getCause() method is now the preferred means of obtaining this information.

Returns:
the Exception that was raised while loading a class
Since:
1.2
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    public Throwable getException() {
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        return ;
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    }

    
Returns the cause of this exception (the exception that was raised if an error occurred while attempting to load the class; otherwise null).

Returns:
the cause of this exception.
Since:
1.4
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    public Throwable getCause() {
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        return ;
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    }
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