Description Paul Hoser 2011-03-11 08:45:06 EST

Build Identifier: 201005251253

If a constraint registered via the XMLConstraintProvider uses the putCurrentConstraintData() method on the AbstractValidationContext the first time its validate() method is called the data stored in the AbstractValidationContext can not be retrieved in later calls to the Constraint's validate() method via the getCurrentConstraintData().

public class MyConstraint extends AbstractModelConstraint {

  private int fCounter = 0;

  public IStatus validate(IValidationConstext ctx) {
    if(fCounter == 0) {
      ctx.putCurrentConstraintData("MyData");
    } else {
      ((String)ctx.getCurrentConstraintData()).length();
    }
    fCounter++;
  }

}

The above Constraint will throw a NPE the second time it is being called. This due to the fact that when being called the first time the AbsttractValidationContext's currentConstraint field (which is used as storage key in the putCurrentConstraintData() method) is a AbstractConstraintProvider$ConstraintProxy.
When the Constraint is called the second time the currentConstraint field of the AbstractValidationContext is a JavaConstraintParser$ConstraintAdapter. Two different objects are used as a key for storing and retrieving.

Reproducible: Always