jar file very big

Hi

initially when i started making changes to my project , the size of jar file was 2 mb not its 6 mb

i m sure i ma dding unnecessary things

please tell me does the import add modules to jar file.

compared to my older jar file , i have seen following packages added.please give me some idea from where do they come from

org/apache/html/dom/
com/lowagie/bc/asn1/
oracle/sql/
com/sun/
com/sun/java/
com/sun/java/help/
javax/
javax/help/
javax/help/plaf/
javax/help/plaf/basic/
javax/help/plaf/basic/images/
org/jdom/
org/jdom/adapters/
org/jdom/adapters/AbstractDOMAdapter.class
org/apache/log4j/
org/apache/log4j/xml/

regards

Your question doesn't make much sense.
Which jar file are you concerned about?
What are exactly are you trying to do?

sorry for not being clear

the thing is i find my runnable jar bigger than when i make a normal jar

when i use eclipse Export Wizard

for my understanding , based on what conditions are components packed into a jar i.e. for example

in my runnable jar contents i find
org/apache/xerces/dom/DocumentImpl.class

which i import com.sun.org.apache.xerces.internal.dom.DocumentImp l;
in my application

i assume import leads to DocumentImpl.class being added to the jar file ( correct me if im wrong )

But the issue is many other classes are also added to jar
org/apache/xerces/dom/ASDOMImplementationImpl.class
org/apache/xerces/dom/ASModelImpl.class
org/apache/xerces/dom/AttributeMap.class
org/apache/xerces/dom/AttrImpl.class
org/apache/xerces/dom/AttrNSImpl.class
org/apache/xerces/dom/CDATASectionImpl.class
org/apache/xerces/dom/CharacterDataImpl$1.class
org/apache/xerces/dom/CharacterDataImpl.class

My question , why is this happening , and where should i control it ?

regards

Who created the runnable jar? If you create the jar file yourself then it's you who decides what goes into it.

yes
but i do not need the following

org/apache/xerces/dom/ASDOMImplementationImpl.class
org/apache/xerces/dom/ASModelImpl.class
org/apache/xerces/dom/AttributeMap.class
org/apache/xerces/dom/AttrImpl.class
org/apache/xerces/dom/AttrNSImpl.class
org/apache/xerces/dom/CDATASectionImpl.class
org/apache/xerces/dom/CharacterDataImpl$1.class
org/apache/xerces/dom/CharacterDataImpl.class

which are also added to jar

dunno why !!

Ok, answer the following questions.

Who created the jar?
If it is you created the jar file, how did you create the jar file?

i use eclipse Export Wizard --> Selected "Runnable Jar" -->

Selected option
"Extract Required Lib into generated jars"

pressed Finish

in Eclipse

So you are asking eclipse to generate the jar and you don't know exactly what that export function does?
Better read the eclipse help to find out what the function does and how to make it do what you want.