diff --git a/back_end/src/main/java/hackathon/FrisbYEE/jpa/service/CoachDAO.java b/back_end/src/main/java/hackathon/FrisbYEE/jpa/service/CoachDAO.java
index 8c4266b..8dadd94 100644
--- a/back_end/src/main/java/hackathon/FrisbYEE/jpa/service/CoachDAO.java
+++ b/back_end/src/main/java/hackathon/FrisbYEE/jpa/service/CoachDAO.java
@@ -1,10 +1,14 @@
 package hackathon.FrisbYEE.jpa.service;
 
 import hackathon.FrisbYEE.jpa.metier.Coach;
+
+import java.util.Optional;
+
 import org.springframework.data.jpa.repository.JpaRepository;
 import org.springframework.stereotype.Repository;
 
 @Repository
 public interface CoachDAO extends JpaRepository<Coach, Integer> {
-
+    boolean existsByKeycloakId(String keycloakId);
+    Optional<Coach> findByKeycloakId(String keycloakId);
 }
\ No newline at end of file
diff --git a/back_end/src/main/java/hackathon/FrisbYEE/rest/AthleteResource.java b/back_end/src/main/java/hackathon/FrisbYEE/rest/AthleteResource.java
index cc9112e..5d18586 100644
--- a/back_end/src/main/java/hackathon/FrisbYEE/rest/AthleteResource.java
+++ b/back_end/src/main/java/hackathon/FrisbYEE/rest/AthleteResource.java
@@ -76,10 +76,9 @@ public class AthleteResource {
     })
     @GetMapping("/{id}")
     @PreAuthorize("hasRole('admin') or hasRole('coach') or hasRole('athlete')")
-    public ResponseEntity<AthleteDTO> getById(@PathVariable Integer id) {
-        return athleteDAO.findById(id)
-                .map(athlete -> ResponseEntity.ok(mapToDTO(athlete)))
-                .orElse(ResponseEntity.notFound().build());
+    public ResponseEntity<AthleteDTO> getById(@PathVariable String id) {
+        Athlete athlete = athleteDAO.findByKeycloakId(id).get();
+        return ResponseEntity.ok(mapToDTO(athlete));
     }
 
     @Operation(summary = "Met à jour l'athlète ayant l'identifiant correspondant")
diff --git a/back_end/src/main/java/hackathon/FrisbYEE/rest/CoachResource.java b/back_end/src/main/java/hackathon/FrisbYEE/rest/CoachResource.java
index acd34f1..1b054eb 100644
--- a/back_end/src/main/java/hackathon/FrisbYEE/rest/CoachResource.java
+++ b/back_end/src/main/java/hackathon/FrisbYEE/rest/CoachResource.java
@@ -39,10 +39,10 @@ public class CoachResource {
         return dtos;
     }
 
-    @GetMapping("/{id}")
+    @GetMapping("/{keycloak_id}")
     @PreAuthorize("hasRole('Admin') or hasRole('Coach')")
-    public CoachDTO getById(@PathVariable Integer id) {
-        Coach coach = coachDAO.findById(id)
+    public CoachDTO getById(@PathVariable String keycloak_id) {
+        Coach coach = coachDAO.findByKeycloakId(keycloak_id)
                 .orElseThrow(() -> new ResponseStatusException(HttpStatus.NOT_FOUND, "Coach not found"));
         return mapToDTO(coach);
     }