ADF, Continuous Query Notification, JDeveloper

Override inputListOfValues component model and Continuous Query Notification sample in ADF

Requirement: Standard ADF inputListOfValues component should behave like this: When pressed “Search”, action should stop and wait untill any change happen in DB table being searched When change happen in DB table, search should resume among updated data. If no change happen it should resume after 10 seconds timeout In addition – search input field validation should happen on “Search”…

Continue Reading

Continuous Query Notification, WebSocket

WebSocket together with DB Change Notification in ADF for immediate data refresh in browser (complete sample).

Requirement We have DB table contents displayed in ADF GUI After changes in that DB table (by anyone else in the background) we want to immediately display in our currenlty open browser session Solution To achieve our goal we need somehow to know when changes in DB happen. Once we know when, need to notify browser session in order it…

Continue Reading

Continuous Query Notification

How to select all JDBC Database Change Notification Registrations and clean them?

Question: How do I select all database change notifications registered via JDBC driver by my DB user? Answer: select * from user_change_notification_regs Question: How do I clean all of my DB change notifications? Answer: Database change notifications registered via JDBC driver can be deregistered only the same way – using JDBC driver. Therefore you need to execute this code: This…

Continue Reading


I get JBO-25200: Application module is not connected to a database exception. What can be the reason?

Problem Time to time “JBO-25200: Application module is not connected to a database” exception is raised while browsing ADF application Solution Tune ADF application module by disabling “Support Dynamic JDBC Credentials”. However this solution may not work in your case, depends on the root cause. Comment If I understand this option correctly, it is needed only when application users must…

Continue Reading


Ubuntu vpn connects successfully and shortly thereafter fails – network traffic stops – either VPN and local network

I’ve started to use Ubuntu for my job needs and experienced first pretty annoying challenge with VPN connection. I’m using openvpn client with network manager. After successfull connect to VPN server I can use local and remote networks with no problem. After a while – like 1 -10 minutes , sometimes a bit longer up to couple hours or sometimes…

Continue Reading


ADF how to stretch table vertically and horizontally?

How to stretch ADF table vertically to fill maximum available vertical space in browser? Answer: Put table into af:panelStretchLayout component center facet. Put dimensionsFrom=”parent” attribute into af:panelStretchLayout (parent of af:panelStretchLayout component must stretch its children) How to stretch ADF table horizontally to fill maximum available horizontal space in browser? Answer: Put table into af:panelStretchLayout component center facet. Add styleClass=”AFStretchWidth” attribute to af:panelStretchLayout Example:   <af:panelStretchLayout…

Continue Reading

ADF, ADF Exceptions

ADF java.lang.ClassCastException: …ViewRowImpl cannot be cast to …ViewRow ?

For example: java.lang.ClassCastException: model.DepartmentsViewRowImpl cannot be cast to model.common.DepartmentsViewRow JDeveloper, when generating View Object Row client interface sometimes goes wrong with class definition. Such error can be displayed when implementation of class is not defined. In particular error sample –  “implements DepartmentsViewRow” is missing in DepartmentsViewRowImpl class: public class DepartmentsViewRowImpl extends ViewRowImpl implements DepartmentsViewRow { … }