In a tasklist task form, if you enter something that violates a validation, there is no friendly message for the User.
In other words the app says:
"Communication Error: The application received an unexpected 400 response from the server. Try to refresh the page or login and out of the application."
The log file however, is more informative:
"Caused by: java.lang.NumberFormatException: For input string: "d not a number sdfadsfsf""
It would be nice if the UI said something similar to inform the User what validation problem occurred. Without this, they could get stuck not knowing how to proceed.