When traversing a property path a null should be handled more gracefully
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Key: TAP5-497
URL: https://issues.apache.org/jira/browse/TAP5-497
Project: Tapestry 5
Issue Type: Improvement
Components: tapestry-core
Affects Versions: 5.0.18
Reporter: Folke Behrens
It would be nice if no NullPointerException is thrown if a parent property is
null.
E.g. When the value of "user.status.flag" is resolved and the "user" property
or the "status" sub-property is null then an NPE is thrown. Here it would be
nice if there's a way to say that it's ok to just return null and not the value
of "flag". I think OGNL solves this by allowing a question mark instead of
period in the property path: "user?status?flag", ugly but very convenient.
This is especially useful with embedded entities (JPA) and Hibernate. Hibernate
sets embedded entities to null if all their properties are null in the database.
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