Hi Prasad,
Are you able to identify elements in other java based applications(with Java extension installed)?
Try to troubleshoot java extension(just to be sure it’s correctly installed):
Identifying the elements(selectors) depends on the application. If the app has hidden the the accessibility of UI elements due to security reasons, Citrix and HotKeys should do the trick.
From what i understand, the issue is with the editable fields. Sometimes the one you see on the screen is not the “real” one. The real editable control is created when click the first box. So make sure the selector indicates the right element: use UiExplorer and UiPath Studio debugger to highlight the edit box and see if it’s the real one.
Can you provide Oracle app version, Java version on your system, Java version of the Oracle app?