1. A method for error classification in an integration system, the method comprising: building, within the integration system, an error classifier model, the error classifier model comprising an index of a plurality of error classifications, wherein each error classification comprises plain text; receiving a request to begin a transaction at the integration system; invoking an application associated with the request; in response to invoking the application, receiving a layered error notification, the layered error notification comprising at least two error notifications, a first error notification of the at least two error notifications comprising a first error format of a plurality of error formats, and a second error notification being layered behind the first error notification, the second error notification comprising a second error format of the plurality of error formats, the second error format being different than the first error format; extracting an error message text from the layered error notification, the error message text representing both the first error notification of the first error format and the second error notification of the second error format, resulting in a plain text of the layered error notification; classifying, at an error classifier, the layered error notification to one of a recoverable error or a non-recoverable error based at least on training data at the error classifier model and a comparison of the plain text of the layered error notification with the plain text of the plurality of error classifications; upon the classification of the layered error notification being a recoverable error, re-trying, at the integration system, a first process that resulted in the layered error notification; and upon the classification of the layered error notification being a non-recoverable error, interrupting a second process that resulted in the layered error notification.