jar xvf <one jar file name> could help to extract the .class files
bundled. If the JAR file have the source code available , then you should
have them as well, if no, then you may need other tools to do some kind of
"de-compile".
As for the IDE or other application to include your jar file, you can just
add the JAR file or the folder you just extracted into the class path (
somewhere in IDE's setting ).

Best regards.
____________________________________________________________________________________________
Gavin, Zhang Gan --
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IBM i J9 Team Lead,
Email: zhanggan@xxxxxxxxxx
Phone: +86-10-82452719
Address: 1/F, 28, ZhongGuanCun Software Park, No.8 Dong Bei Wang West
Road, Haidian District, Beijing P.R.China 100193
J9 on i:
[2]https://www.ibm.com/developerworks/community/wikis/home?lang=en#!/wiki/IBM%20i%20Technology%20Updates/page/Java%20on%20IBM%20i



----- Original message -----
From: Glenn Bruckner <glenn.bruckner@xxxxxxxxx>
Sent by: "JAVA400-L" <java400-l-bounces@xxxxxxxxxxxx>
To: "java400-l@xxxxxxxxxxxx" <java400-l@xxxxxxxxxxxx>
Cc:
Subject: New to Java on iSeries.
Date: Fri, Dec 8, 2017 12:33 AM

Hi,

We currently have a JAVA program that is being called from an RPG
program to connect to a UPS website to perform package rating. The
program is building an XML object to pass to the website and parsing the
returned XML to pass the rates back to our RPG program. The Java
program was written many years ago and the user id, access key and URL
are all hardcoded.

A few weeks ago, we had trouble with the webservice call because UPS is
working on updating their servers to use TLS 1.1 and above. Beginning
January 1st, one will only be able to connect using TLS 1.1 or higher.

Our system administrator installed Java 7, both 32 and 64 bit, on our
iSeries partitions per the recommendation from IBM.
Our iSeries partitions are running OS Version 7.1

I updated our CL program that starts the JVM using the cacerts,
java.security and java.policy from the JDK70 folders(copied to another
folder) and tested the program. All seems to be working well.

The dilemma is now the business has asked that we make some changes to
the program. From what I see, it appears that we only have the JAR
file.
I have been unable to find the source/class files used to create the JAR
file.
I have downloaded the JAR file to my PC and been examining the contents
via a Java decompile utility.

Is there a way to extract the classes from the JAR?
Do I have to use a JAR de-compile tool and manually create the classes?
Is there a way to import the JAR file into an IDE like Eclipse or
IntelliJ to be able to make the required changes?

Thanks,
Glenn

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