generate correct schema if parent class has only a single child #125
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Parent classes that only have a single child (e.g. because they are open for extension, but not yet have more children) are generating a wrong schema. The emitted oneOf element has only a single $ref, which is not valid. It needs at least two array elements. This is changed, so that oneOf is only emitted if more than one child is available.
@mbknor Right now we have a workaround using @JsonSchemaInject but it would be cool to see this fixed.