better exception message for step with commit-interval null [BATCH-2518]

Michael Pralow opened BATCH-2518 and commented

if you use a standard chunk processing step with parameterized commit-interval like

<batch:tasklet>
  <batch:chunk reader="reader" processor="processor" writer="writer" commit-interval="#{jobParameters['commitInterval']}">
  </batch:chunk>
</batch:tasklet>

and forget to provide the job parameter, thus getting a null there (i guess it is null), the exception is

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'scopedTarget.org.springframework.batch.repeat.policy.SimpleCompletionPolicy#0': Could not resolve matching constructor (hint: specify index/type/name arguments for simple parameters to avoid type ambiguities)

it would be cool to get a better hint for the real cause here

Affects: 3.0.7

Start by reproducing the XML chunk configuration with a parameterized commit-interval and no matching job parameter. Trace the bean creation path that produces the SimpleCompletionPolicy constructor error. Done means the exception gives a useful hint about the missing or null commit interval.