[CAMEL-6674] Add allowNull option to @Converter to allow type converters to return null as valid response for special use-cases

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.11.1
• Fix Version/s: 2.11.2, 2.12.0
• Component/s: camel-core
• Estimated Complexity: Unknown
• Assignee: Claus Ibsen
• Reporter: Claus Ibsen
• Created: 28/Aug/13 12:49
• Updated: 02/Sep/13 08:53
• Resolved: 29/Aug/13 06:30

Description

See nabble
http://camel.465427.n5.nabble.com/Xpath-parameter-binding-NodeList-vs-Node-tp5738067.html

This avoids the situation with the NodeList -> Node converter that may return null the 1st time, and then its regarded as a misses for conversion in future attempts.

Just be annotation the method from
@Converter

to:
@Converter(allowNull = true)

Should allow to fix this. As then the type converter registry knows that a null response is valid.