How to get CRC check sum of files in java EAR file without extracting .jar/.war files to disk.?


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# 1  
How to get CRC check sum of files in java EAR file without extracting .jar/.war files to disk.?

unzip -v gives CRC info of each file in a zip(in my case .EAR) file.

Code:
# unzip -v my-application.ear
Archive:  my-application.ear
 Length   Method    Size  Cmpr    Date    Time   CRC-32   Name
--------  ------  ------- ---- ---------- ----- --------  ----
  197981  Defl:N   183708   7% 2016-03-10 19:01 90fbac01  file-core.jar
  210547  Defl:N   196091   7% 2016-03-10 19:01 b021ffd8  utilcommon.jar
.......

I am trying to compare two large EAR files, that contain around 200 .jar, .war files.

Is there a way to get CRC check sum values for files(like .class, .properties) without extracting underlying .jar/.war files from java EAR file?

Extracting hundreds of jar war files to disk to get CRC values is very slow and time consuming. Any other ideas to make it fast?
# 2  
As the .jar/.war files are compressed in the .ear file they is no way without extracting them to list their contents.

However, this could certainly be automated with a script (which would be extracting each .jar/.war file to a temp location and listing this in "under the hood").

From a user point of view you could do:

Code:
# getearcrc my-application.ear
Archive              CRC-32    Name
-------              --------  ----
file-core.jar        8d995904  META-INF/MANIFEST.MF
file-core.jar        cf8577fe  a.class
...
utilcommon.jar       2224558c  MalformedJsonException.class
utilcommon.jar       020bca22  StringPool.class


Last edited by Chubler_XL; 03-16-2016 at 07:56 PM..
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