Details
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Type:
Bug
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Status: Closed
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Priority:
Minor
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Resolution: Invalid
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Affects Version/s: 5.2.4
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Fix Version/s: None
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Component/s: documentation, tapestry-core
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Labels:None
Description
In Tapestry 5.1.0.5, you can have code such as:
@Component
private Form inputs;
...
if (inputs.getDefaultTracker().getHasErrors())
...
This fails in 5.2.4 because getDefaultTracker() returns null if there are no errors. This appears to be related to this closed bug:
https://issues.apache.org/jira/browse/TAP5-979
Perhaps getDefaultTracker() should check for a null and return an empty one to be backwards compatible with 5.1.0.5? Alternatively, document it as a known incompatibility in the release notes.
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Its unfortunate that sometimes components must implement public methods that are not intended to be invoked except under certain situations (perhaps we need to make that a @Property, or create a new annotation to identify "hands off" methods). In any case, see the workaround in the comments.
Darn this grey area.
Form implements FormValidationControl; if you want to know if a Form has any errors, just invoke getHasErrors() directly on the Form. You should not need to invoke getDefaultTracker().