getting jar file version number

[mohamed123]

Hi
how to access an application server and get the version number of the jar files in that server ?
I am beginner in java
Regards

[ltcmelo]

Hello mohamed.

To have access to the version of a jar file, you should have access to the jar file. Precisely, you need to take a look at the jar file's manifest (but not always a version is specififed).

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Leandro T. C. Melo
http://www.pazbrasil.org/

[mohamed123]

Hi
Thanx for the reply

is there way to get this version programmatically ?

Regards

[Londbrok]

Jar file is a zipped file. Basically you need to access it to get the files it contains, process the list of files untill you find manifest file, process that untill you come across version number.

The link below is about compressed files handling. Might be usefull.

http://www.javalobby.org/java/forums/t16299.html

[ltcmelo]

Hello again.

is there way to get this version programmatically ?

Once you have access to the jar file, you could try this:

JarFile jarfile = new JarFile("jarfile.jar");

Manifest manifest = jarfile.getManifest();

//Iterate over the manifest's entries looking for what you need.
//Check out the Manifest class API.

You just need to check the java docs for the Manifest class.

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Leandro T. C. Melo
http://www.pazbrasil.org/

[Londbrok]

you are most correct. Far better to use the class for Jar Files.