Several problems:
- Setting the system property is not enough since the `static` parser already has its configuration
- Changing the ParametersWrapper to `private` makes property accessing not compilable (the method and class must be public).
- The expression...
#target.messageAndHeader(message, headers['number'] != null ? headers['number'] : T(org.springframework.util.Assert).isTrue(false, 'required header not available: number'))
...is not compilable anyway because the right arguent to the `!=` is not compilable because the `TypeReference.exitTypeDescriptor` is `null`.
This commit addresses the first two.
Polishing
Use a compilable method.
* Simple polishing
eaaa21ef5d