What is the best way to do Unique Key validation?

Hi All,
I'll have to provide a user friendly message when users create a record using an existed key (Most of the keys are combination key).
How to do it in a generic way?
Thank you in advance.

I have add this class:
public class CustomMessageBundle extends ListResourceBundle {
     public CustomMessageBundle() {
          super();
     protected Object[][] getContents() {
          return sMessageStrings;
     private static final Object[][] sMessageStrings
          = new String[][] {
          {"SCH_PK","violate SCH_PK"} --------SCH_PK is a combination key created in DB
In project properties->business components->options, added this class with its path to "Custom message bundles to use in this project"
But when I craete a new row using existed key(XXX YYY), it still gives me this message:
Too many objects match the primary key oracle.jbo.Key[XXX YYY].

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What is the best way to do Unique Key validation?

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