JBO-29000 Exception: ContentDB Data control

Question

Hi,
After sucessfully establishing the Data control connection with content db http://servername:port/content/ws for the first time, I got the following error
oracle.jbo.JboException: JBO-29000: Unexpected exception caught: java.lang.NullPointerException, msg=null     at oracle.adf.model.binding.DCDataControlReference.getDataControl(DCDataControlReference.java:56)     at oracle.adf.model.BindingContext.get(BindingContext.java:457)     at oracle.adf.model.binding.DCUtil.findSpelObject(DCUtil.java:280)     at oracle.adf.model.binding.DCUtil.findSpelObject(DCUtil.java:248)     at oracle.adf.model.binding.DCUtil.findContextObject(DCUtil.java:383)     at oracle.adf.model.binding.DCIteratorBinding.<init>(DCIteratorBinding.java:127)     at oracle.jbo.uicli.binding.JUIteratorBinding.<init>(JUIteratorBinding.java:60)
Do I need to add/configure some more setting after setting up the data control? I am confused where do I need to input DB credentials. I don't know what I am missing. Please help

Answer 1

hi !
unfortunately this is a pretty generic error, but from the error stack you posted it seems that there is something wrong with the data control ... well ... what exactly it does not say.
therefore here a couple of questions:
-) has it ever worked or do you get this error when you try to run the page ?
-) have you tried editing the data control (right click on the data control in palette and use the "edit" item in the context menu) to see if the test button still successfully works ?
-) have you tried whether the CDB instance (with the URL you gave in the data control) is still accessible ?
-) have you tried to create a new data control (optionally in a brand new project) ?
regarding the credential question there are two possible scenarios:
-) if your app is not secured or all users should use the same credentials, provide the necessary credentials in the wizard.
-) if your app is secured and you want to pass the application identity to CDB, you need to set up a secure connection to CDB using WSS or S2S (depending on which version of CDB you are using) and check the corresponding box in the wizard, right below the credential input fields.
thanks,
philipp