feat: better error message

src/main/java/fr/titionfire/ffsaf/rest/exception/DetailExceptionMapper.java

@@ -0,0 +1,19 @@
+package fr.titionfire.ffsaf.rest.exception;
+
+import jakarta.ws.rs.core.MediaType;
+import jakarta.ws.rs.core.Response;
+import jakarta.ws.rs.ext.ExceptionMapper;
+import jakarta.ws.rs.ext.Provider;
+
+@Provider
+public class DetailExceptionMapper implements ExceptionMapper<DetailException> {
+
+    @Override
+    public Response toResponse(DetailException e) {
+        return Response.status(e.getStatus())
+                .entity(e.getMessage())
+                .type(MediaType.TEXT_PLAIN_TYPE)
+                .build();
+    }
+
+}