JBO-27023 Failed to validate all rows

Have you ever experience weird error reporting as shown below, while trying to throw some meaningful validation error from your business methods?
Instead of the desired error, UI reports a generic error saying
JBO-27023 : “Failed to validate all rows”.
What goes wrong?
Take a look at your manged bean where you have the code to invoke methods from ApplicationModule(service layer). Your code may look like as shown below, where you are getting instance of ApplicationModule and invoking methods directly on it.This is not the recommended approach, as you are by passing binding layer. Suggested approach is to let the binding layer to do this job as shown under 'Right Implementation'

Wrong Implementation

    public String someAction() {
        BindingContext bc = BindingContext.getCurrent();
        DCDataControl dc = bc.findDataControl(dataControlName);
        if ((dc != null) && dc instanceof DCJboDataControl) {
            ApplicationModuleImpl amImpl =
                (ApplicationModuleImpl)dc.getDataProvider();
            amImpl.doSomething();
        
        }
        return "success"
    }

Right Implementation

Expose the ApplicationModule method to client and define a methodAction binding for the same, then use the ADF binding api to do the job.

       public String someAction() {
        BindingContainer bindings = getBindings();
        OperationBinding ob = bindings.getOperationBinding("doSomething");
        Object result = ob.execute();
        if (!ob.getErrors().isEmpty()) {
            return "error";
        }
        return "success";
    }

Advantages
1. This gives clear separation between tiers/layers of your application
2. Ensures both binding layer and service layer are in synch.
3. Provides uniform error handling


Learn More ...

There are a lot more points like this. If  you are curious to learn the internals of the ADF Business Components and ADF Binding Layer,  the following book is for you - Oracle ADF Real World Developer’s Guide.
More details about this book can be found in this post- http://jobinesh.blogspot.in/2012/07/pre-order-your-copy-of-oracle-adf-real.html