Trying to add some caching

src/main/java/eu/hbp/mip/MIPApplication.java

@@ -6,8 +6,10 @@ package eu.hbp.mip;
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.cache.annotation.EnableCaching;
 
 @SpringBootApplication
+@EnableCaching
 public class MIPApplication {
 
     public static void main(String[] args) {

src/main/java/eu/hbp/mip/utils/DataUtil.java

@@ -2,6 +2,7 @@ package eu.hbp.mip.utils;
 
 import com.google.gson.JsonArray;
 import com.google.gson.JsonObject;
+import org.springframework.cache.annotation.Cacheable;
 import org.springframework.jdbc.core.JdbcTemplate;
 
 import java.util.List;
@@ -22,6 +23,7 @@ public class DataUtil {
         this.jdbcTemplate = jdbcTemplate;
     }
 
+    @Cacheable("varsdata")
     public JsonObject getDataFromVariables(List<String> vars)
     {
         JsonObject data = new JsonObject();
@@ -48,6 +50,7 @@ public class DataUtil {
         return data;
     }
 
+    @Cacheable("colscount")
     public long countVariables()
     {
         long count = jdbcTemplate.queryForObject(
@@ -56,6 +59,7 @@ public class DataUtil {
         return count;
     }
 
+    @Cacheable("rowscount")
     public long countAdniRows()
     {
         long count = jdbcTemplate.queryForObject(