why size is coming difference through ant jdeveloper

expand the two wars and do a diff to determine if there is any difference in the contents
if the contents are the same then the difference is probably compression used.

how to diff the to wars if there is any difference in the contents??

if i open up 2 wars i can't see difference contents wise;

do u think for compression will it make that much difference??

first expand then (they are just zip files) then diff the expanded directories

> do u think for compression will it make that much difference??

yes, if one isn't compressed at all

i want to update classes in WEB-INF/classes of A.war;but it is creating another folder outside WEB-INF;

 
 <property name="blddir" value="../Web/classes"/>
 <property name="temp" value="c:/temp"/>


  <jar jarfile="${temp}/A.war"  update="true" destdir="${blddir}">
             <fileset dir="${temp}">
               <include name="WEB-INF/*.class" />
           </fileset>
     </jar>

why is not compressing??

it should be.
why are you not using the war task?

http://ant.apache.org/manual/CoreTasks/war.html

that could be another reason for difference.

first i used war task only then it gives large size;then i go for jar task for creating war also;

i've posted numerous reasons why the size would be different, and what to check to determine the reason.

i used war task only but still getting the large difference.i have verified both wars i didnt find any difference between the files.still why its coming difference;how to do compression???

they are both zip files, if the files are identical then the level of compression must be different.
you can check it with winzip or similiar.

how can i check with winzip or winrar the level of compression ??