Allow for null-safe nested paths in BeanWrapperFieldExtractor [BATCH-2531]

[spring-projects-issues]

Krishna Bhamidipati opened BATCH-2531 and commented

Hello!

Currently, nested paths are not null-safe in BeanWrapperFieldExtractor. For example if the property name is

a.b.c

where a is not null but b is null, it throws an exception like:

org.springframework.beans.NullValueInNestedPathException: Value of nested property 'a.b' is null

It would be nice to either:

• support a null-safe ?. operator like SpEL (http://docs.spring.io/spring/docs/current/spring-framework-reference/html/expressions.html#expressions-operator-safe-navigation)
• create a new property on BeanWrapperFieldExtractor that is able to set the BeanWrapper#setAutoGrowNestedPaths boolean property to true

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Affects: 3.0.3

[spring-projects-issues]

Mahmoud Ben Hassine commented

Nice idea! I would opt for the second option and support the usage of the safe navigation operator of SpEL.

We will discuss this feature internally and let you know if we decide to add it to the framework or not.