Before this commit, the configuration of infrastructure beans
was confusing and not straightforward to customize. This commit
changes the way Batch infrastructure beans are configured.
The most important changes are:
* EnableBatchProcessing now provides new attributes to
configure properties of infrastructure beans
* Bean registration is now done programmatically with a
BeanDefinitionRegistrar instead of importing a class with
statically annotated bean definition methods
* Bean are now resolved from the application context directly
instead of being resolved from a BatchConfigurer
* Both a data source and a transaction manager are now
required to be defined in the application context
* A new configuration class called DefaultBatchConfiguration
with default infrastructure bean definitions is now provided
and can be extended to customize the default configuration
Resolves#3942
48e437ae17