Update Spring Data Redis example to use constructor injection

spring-data-redis/src/main/java/org/baeldung/spring/data/redis/repo/StudentRepository.java

@@ -1,6 +1,7 @@
 package org.baeldung.spring.data.redis.repo;
 
 import org.baeldung.spring.data.redis.model.Student;
+import org.springframework.data.redis.core.RedisTemplate;
 import org.springframework.stereotype.Component;
 
 import java.util.Map;

spring-data-redis/src/main/java/org/baeldung/spring/data/redis/repo/StudentRepositoryImpl.java

@@ -2,9 +2,11 @@ package org.baeldung.spring.data.redis.repo;
 
 import org.baeldung.spring.data.redis.model.Student;
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.data.redis.core.HashOperations;
 import org.springframework.data.redis.core.RedisTemplate;
 import org.springframework.stereotype.Repository;
 
+import javax.annotation.PostConstruct;
 import java.util.Map;
 
 @Repository
@@ -12,26 +14,36 @@ public class StudentRepositoryImpl implements StudentRepository {
 
     private static final String KEY = "Student";
 
-    @Autowired
     private RedisTemplate<String, Object> redisTemplate;
+    private HashOperations hashOperations;
+
+    @Autowired
+    public StudentRepositoryImpl(RedisTemplate<String, Object> redisTemplate) {
+        this.redisTemplate = redisTemplate;
+    }
+
+    @PostConstruct
+    private void init() {
+        hashOperations = redisTemplate.opsForHash();
+    }
 
     public void saveStudent(final Student student) {
-        redisTemplate.opsForHash().put(KEY, student.getId(), student);
+        hashOperations.put(KEY, student.getId(), student);
     }
 
     public void updateStudent(final Student student) {
-        redisTemplate.opsForHash().put(KEY, student.getId(), student);
+        hashOperations.put(KEY, student.getId(), student);
     }
 
     public Student findStudent(final String id) {
-        return (Student) redisTemplate.opsForHash().get(KEY, id);
+        return (Student) hashOperations.get(KEY, id);
     }
 
     public Map<Object, Object> findAllStudents() {
-        return redisTemplate.opsForHash().entries(KEY);
+        return hashOperations.entries(KEY);
     }
 
     public void deleteStudent(final String id) {
-        this.redisTemplate.opsForHash().delete(KEY, id);
+        hashOperations.delete(KEY, id);
     }
 }