The latest release of Toad for Oracle is out and one of the new features is the (re)introduction of the JDWP Debugger which provides additional functionality over the existing DBMS debugger such as viewing user-defined data types, descriptive exception reporting, and viewing variable information at different scopes.
This is a companion discussion topic for the original entry at https://blog.toadworld.com/getting-started-with-the-jdwp-debugger-in-toad-for-oracle-13.1