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Posted to dev@tapestry.apache.org by "Folke Behrens (JIRA)" <ji...@apache.org> on 2009/02/04 16:45:59 UTC
[jira] Created: (TAP5-497) When traversing a property path a null
should be handled more gracefully
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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[jira] Closed: (TAP5-497) When traversing a property path a null
should be handled more gracefully
Posted by "Howard M. Lewis Ship (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/TAP5-497?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Howard M. Lewis Ship closed TAP5-497.
-------------------------------------
Resolution: Invalid
Assignee: Howard M. Lewis Ship
Use the ?. operator:
user?.status?.flag
> When traversing a property path a null should be handled more gracefully
> ------------------------------------------------------------------------
>
> 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
> Assignee: Howard M. Lewis Ship
>
> 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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[jira] Closed: (TAP5-497) When traversing a property path a null
should be handled more gracefully
Posted by "Howard M. Lewis Ship (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/TAP5-497?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Howard M. Lewis Ship closed TAP5-497.
-------------------------------------
Resolution: Invalid
Assignee: Howard M. Lewis Ship
Use the ?. operator:
user?.status?.flag
> When traversing a property path a null should be handled more gracefully
> ------------------------------------------------------------------------
>
> 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
> Assignee: Howard M. Lewis Ship
>
> 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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