Add to CLASSPATH
The Add To CLASSPATH environment variable parameter enables the Java Virtual Machine (JVM) and other Java applications to locate the Java class libraries, including any user-defined class libraries. Because PeopleTools automatically generates CLASSPATH entries for core, delivered class libraries, use this variable to specify additional class libraries that the PeopleSoft software needs to access. To use this parameter, you need to uncomment it in the PSAPPSRV.CFG file.
The PeopleCode API Reference provides details on where you can place custom and third-party Java classes.
See PeopleCode API Reference: System Setup for Java Classes.