[jboss-user] [JBoss Seam] - Alternate property reference style in EL not working

[pgmjsd]

It looks like http://jira.jboss.org/jira/browse/JBSEAM-580 has resurfaced.

I'm using Seam 1.2.1.GA and I get a String index out of bounds exception when I use the alternate syntax for referencing an entity property: #{entity[fieldName]}

Here is the stack trace:
18:57:39,147 ERROR [STDERR] java.lang.StringIndexOutOfBoundsException: String index out of range: -1
  | 18:57:39,148 ERROR [STDERR] 	at org.jboss.seam.ui.ModelValidator.validate(ModelValidator.java:32)
  | 18:57:39,148 ERROR [STDERR] 	at javax.faces.component._ComponentUtils.callValidators(_ComponentUtils.java:157)
  | 18:57:39,148 ERROR [STDERR] 	at javax.faces.component.UIInput.validateValue(UIInput.java:312)
  | 18:57:39,148 ERROR [STDERR] 	at javax.faces.component.UIInput.validate(UIInput.java:353)
  | ...
  | 

Basically, the following method in Expressions.java throws because 'dot' is -1:

  |    public InvalidValue[] validate(String propertyExpression, Object value)
  |    {
  |       int dot = propertyExpression.lastIndexOf('.');
  |       int bracket = propertyExpression.lastIndexOf('[');
  |       if (dot<=0 && bracket<=0) 
  |       {
  |          return new InvalidValue[0];
  |       }
  |       String componentName;
  |       String propertyName;
  |       if (dot>bracket)
  |       {
  |          componentName = propertyExpression.substring(2, dot);
  |          propertyName = propertyExpression.substring( dot+1, propertyExpression.length()-1 );
  |       }
  |       else
  |       {
  |          componentName = propertyExpression.substring(2, bracket);
  |          propertyName = propertyExpression.substring( bracket+1, propertyExpression.length()-2 );
  |       }
  |       String modelExpression = propertyExpression.substring(0, dot) + '}';
  |       
  |       Object modelInstance = createValueBinding(modelExpression).getValue(); //TODO: cache the ValueBinding object!
  |       return getValidator(modelInstance, componentName).getPotentialInvalidValues(propertyName, value);
  |    }
  | 

Does anyone know of a way to work around this?  I'm trying to make a generic Facelets tag for input fields and I can't because it won't let me bind to a property using this syntax.


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