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56.4. Nullable Options
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In some cases, it can make sense to let method arguments default to
null
. But this is not allowed by default. If you want to allow some of your method arguments from the Java API to take null
values, you must declare this explicitly using the nullableOptions
element.
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The
nullableOptions
element can be defined with one or more nullableOption
child elements, as follows:
<nullableOptions> <nullableOption>ArgumentName</nullableOption> ... </nullableOptions>
<nullableOptions>
<nullableOption>ArgumentName</nullableOption>
...
</nullableOptions>
Where
ArgumentName
is the name of a method argument from the Java API.
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As shown in the following extract, the
nullableOptions
element can optionally appear as a child of the apis
element and/or as a child of api
elements:
You can define the
nullableOptions
element at the following scopes:
- As a child of an
api
element—thenullableOptions
mappings apply only to the API class specified by theapi
element. - As a child of the
apis
element—thenullableOptions
mappings apply to all API classes by default, but can be overridden at theapi
level.
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The following example shows the nullable options declared for the
CompaniesResource
proxy class from the Apache Camel LinkedIn component: