Default MyFaces Error handling throws NullPointerException during component
tree when javax.el.Expression.getExpressionString() is null
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Key: MYFACES-3413
URL: https://issues.apache.org/jira/browse/MYFACES-3413
Project: MyFaces Core
Issue Type: Bug
Components: JSR-314
Affects Versions: 2.1.3
Reporter: Mike Kienenberger
Assignee: Mike Kienenberger
The default MyFaces Error handling throws a NullPointerException during the
writing out of the component tree when an attribute's
ValueExpression.getExpressionString() returns null.
As an example, this can happen with Richfaces 4.1.x skinning as the
org.richfaces.application.GlobalResourcesViewHandler$SkinningResourceRenderedExpression
used for "rendered" on the __rf_skinning_resource UIOutput has a null value for
getExpressionString().
>From what I can tell, it's legal for Expression.getExpressionString() to
>return null.
http://docs.oracle.com/javaee/5/api/javax/el/Expression.html#getExpressionString%28%29
In any case, since this is an error handling routine, it should
probably be more flexible in handling unexpected values.
What do we want to do in this case?
We could skip outputting the attribute.
We could output the attribute with empty string as the value expression.
In this particular case, we could check for isReadOnly() and if true, output
getValue(). Not sure if we'd want to do that in the case of !isReadOnly().
In fact, I'm not entirely certain we want to be evaluating getValue().
We could output the class of the value expression.
As a first pass, I am going to output the value expression as the empty string.
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