JCo is a Java native interface which requires native OS libraries which are provided by SAP. These have to be installed in the java.library.path. If they are missing, an unsatisfied link error occurs.
The SAP Java Connector (short “JCo”) is a development library that enables a Java application to communicate with on-premise SAP systems via SAP’s RFC protocol. The following version of this JCo driver is required:
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SAP Java Connector 3.1
A download package is available on the SAP Support Portal [SAP JCo].