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Allow auto grow for entries w/o default constructor in SpEL

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Prior to this commit, The "auto grow" feature in SpEL expressions only
worked for element types with a default constructor. For example, auto
grow did not work for a list of BigDecimal elements.

This commit inserts a null value in the list when no default
constructor can be found for the element type.

Closes gh-25367
This commit is contained in:
Martin Knopf
2020-07-07 14:47:48 +02:00
committed by Sam Brannen
parent d2e1150c79
commit 35c0ae7b0c
3 changed files with 39 additions and 4 deletions
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8
src/docs/asciidoc/core/core-expressions.adoc
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@@ -339,8 +339,12 @@ index into an array or collection and the element at the specified index is `nul
you can automatically create the element. This is useful when using expressions made up of a
chain of property references. If you index into an array or list
and specifying an index that is beyond the end of the current size of the array or
list, you can automatically grow the array or list to accommodate that index. The following
example demonstrates how to automatically grow the list:
list, you can automatically grow the array or list to accommodate that index. In order to add
an element at the specified index, SpEL will try to create the element using a default
constructor before setting the specified value. If the element type does not have a default
constructor, `null` will be added. Note if there is no built-in or custom converter, that knows
how to set the value, `null` will remain in the array or list at the specified index.
The following example demonstrates how to automatically grow the list:
[source,java,indent=0,subs="verbatim,quotes",role="primary"]
.Java