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src/main/java/com/imprimelibros/erp/paises/PaisesService.java

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+package com.imprimelibros.erp.paises;
+
+import java.text.Collator;
+import java.util.Comparator;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Locale;
+import java.util.Map;
+import java.util.Optional;
+import java.util.stream.Collectors;
+
+import org.springframework.context.MessageSource;
+import org.springframework.stereotype.Service;
+
+@Service
+public class PaisesService {
+
+    protected final PaisesRepository repo;
+    protected final MessageSource messageSource;
+
+    public PaisesService(PaisesRepository repo, MessageSource messageSource) {
+        this.repo = repo;
+        this.messageSource = messageSource;
+    }
+
+    public Map<String, Object> getForSelect(String q1, String q2, Locale locale) {
+
+        try {
+
+            // Termino de búsqueda (Select2 usa 'q' o 'term' según versión/config)
+            String search = Optional.ofNullable(q1).orElse(q2);
+            if (search != null) {
+                search = search.trim();
+            }
+            final String q = (search == null || search.isEmpty())
+                    ? null
+                    : search.toLowerCase(locale);
+
+            List<Paises> all = repo.findAll();
+
+            // Mapear a opciones id/text con i18n y filtrar por búsqueda si llega
+            List<Map<String, String>> options = all.stream()
+                    .map(cc -> {
+                        String key = cc.getKeyword();
+                        String id = cc.getCode3();
+                        String text = messageSource.getMessage("paises." + key, null, key, locale);
+                        Map<String, String> m = new HashMap<>();
+                        m.put("id", id); // lo normal en Select2: id = valor que guardarás (code3)
+                        m.put("text", text); // texto mostrado, i18n con fallback a keyword
+                        return m;
+                    })
+                    .filter(opt -> {
+                        if (q == null || q.isEmpty())
+                            return true;
+                        String text = opt.get("text").toLowerCase(locale);
+                        String id = opt.get("id").toLowerCase(locale);
+                        return text.contains(q) || id.contains(q);
+                    })
+                    .sorted(Comparator.comparing(m -> m.get("text"), Collator.getInstance(locale)))
+                    .collect(Collectors.toList());
+
+            // Estructura Select2
+            Map<String, Object> resp = new HashMap<>();
+            resp.put("results", options);
+            return resp;
+        } catch (Exception e) {
+            e.printStackTrace();
+            return Map.of("results", List.of());
+        }
+    }
+
+}