Hi Kailash, hi Correntin,
I would prefer keeping the jars in the adapter package only.
The native lib (DLL or SO) belongs under the lib directory. This is correct so far.
Due to the fact that this driver is a so-called JNI-driver (Java-Native-Interface: This means it has a native lib, which is then wrapped by Java methods), it is required to stop and restart the IS completely every time when there are changes to driver classes/jars, otherwise the java classes will not load properly.
JCo 3.0.x is no longer supported by SAP and therefore no longer available for download from the SAP Marketplace.
If possible, you can try to ask your SAP Support Team, if they can provide you with a S-Account, with which you can download the latest version of the JCo yourself:
https://support.sap.com/en/product/connectors/jco.html
In the readmes fore the WmSAP 10.1 Fixes there is a section in the beginning, where the minimum JCo version is mentioned.
For Fix 11 this JCo 3.1.5 and JCoIDoc 3.1.1, for Fix13 as mentioned in Kailashs post, this is JCo 3.1.8.
The Readmes are available on Empower (https://empower.softwareag.com/) if you have a valid support contract.
Regards,
Holger