Hi Lassad,
using API v1 (https://doc.nuxeo.com/nxdoc/rest-api-endpoints/):
/nuxeo/api/v1/id/{docId}
/nuxeo/api/v1/path/{path}
you will get a document entity (more info about entities: https://doc.nuxeo.com/nxdoc/rest-api-entity-types/)
And you can find the state attribute in the JSON response.
If you want to get lifecycle state from core using a DocumentModel instance (for example in your listener before delete) , you can use the public getCurrentLifeCycleState() method: https://github.com/nuxeo/nuxeo/blob/master/nuxeo-core/nuxeo-core-api/src/main/java/org/nuxeo/ecm/cor...
Regards,
VS!
