Update Java version to 21 and improve logging in ServerDetails

Upgraded the project to require Java 21 in `pom.xml` and `README.md`. Replaced Lombok's `@Slf4j` with a manually initialized SLF4J logger in `ServerDetails`, and improved code readability by inlining constants. These changes ensure compatibility and enhance maintainability.

Author: pmoustopoulos

README.md

@@ -36,10 +36,10 @@ file on the local file system.
 ## Prerequisites
 Make sure you have installed all the following prerequisites on your development machine:
 
-* **Java 17** - You will need at least Java 17 installed on your machine because it is required by **Spring Boot 3**.
+* **Java 21** - You will need at least Java 21 installed on your machine because it is required by **Spring Boot 3**.
   If you are using IntelliJ, you can easily download it directly from the IDE.
   `File -> Project Structure -> Project -> SDK -> Add SDK -> Download JDK...`. Alternatively, you can download it from
-  here: [Download & Install Java 17](https://www.oracle.com/java/technologies/downloads/#java17)
+  here: [Download & Install Java 21](https://www.oracle.com/java/technologies/downloads/#java21)
 
 
 * **Docker Desktop** - `Integration tests use Testcontainers`, which requires Docker Desktop to be installed and running

openapi-department-api.json

@@ -1,12 +1,12 @@
 {
-  "openapi" : "3.0.1",
+  "openapi" : "3.1.0",
   "info" : {
     "title" : "Department API",
     "description" : "Active profile: DEFAULT",
-    "version" : "2.7.0"
+    "version" : "2.8.5"
   },
   "servers" : [ {
-    "url" : "http://192.168.1.63:8080/department-api",
+    "url" : "http://192.168.1.11:8080/department-api",
     "description" : "Generated server url"
   } ],
   "paths" : {
@@ -572,25 +572,25 @@
   "components" : {
     "schemas" : {
       "DepartmentRequestDTO" : {
-        "required" : [ "departmentCode", "departmentDescription", "departmentName" ],
         "type" : "object",
         "properties" : {
           "departmentCode" : {
+            "type" : "string",
             "maxLength" : 2147483647,
-            "minLength" : 2,
-            "type" : "string"
+            "minLength" : 2
           },
           "departmentName" : {
+            "type" : "string",
             "maxLength" : 2147483647,
-            "minLength" : 2,
-            "type" : "string"
+            "minLength" : 2
           },
           "departmentDescription" : {
+            "type" : "string",
             "maxLength" : 2147483647,
-            "minLength" : 10,
-            "type" : "string"
+            "minLength" : 10
           }
-        }
+        },
+        "required" : [ "departmentCode", "departmentDescription", "departmentName" ]
       },
       "APIResponseDepartmentDTO" : {
         "type" : "object",
@@ -626,11 +626,11 @@
             "type" : "string"
           },
           "employees" : {
-            "uniqueItems" : true,
             "type" : "array",
             "items" : {
               "$ref" : "#/components/schemas/EmployeeDTO"
-            }
+            },
+            "uniqueItems" : true
           }
         }
       },
@@ -666,26 +666,26 @@
         }
       },
       "EmployeeRequestDTO" : {
-        "required" : [ "email", "firstName", "lastName" ],
         "type" : "object",
         "properties" : {
           "firstName" : {
+            "type" : "string",
             "maxLength" : 2147483647,
-            "minLength" : 2,
-            "type" : "string"
+            "minLength" : 2
           },
           "lastName" : {
+            "type" : "string",
             "maxLength" : 2147483647,
-            "minLength" : 2,
-            "type" : "string"
+            "minLength" : 2
           },
           "email" : {
             "type" : "string"
           },
           "salary" : {
             "type" : "number"
           }
-        }
+        },
+        "required" : [ "email", "firstName", "lastName" ]
       },
       "APIResponseEmployeeDTO" : {
         "type" : "object",
@@ -705,7 +705,6 @@
         }
       },
       "EmployeeSearchCriteriaDTO" : {
-        "required" : [ "page", "size" ],
         "type" : "object",
         "properties" : {
           "firstName" : {
@@ -732,7 +731,8 @@
               "$ref" : "#/components/schemas/SortItem"
             }
           }
-        }
+        },
+        "required" : [ "page", "size" ]
       },
       "SortItem" : {
         "type" : "object",
@@ -798,13 +798,13 @@
           "sort" : {
             "$ref" : "#/components/schemas/SortObject"
           },
-          "pageable" : {
-            "$ref" : "#/components/schemas/PageableObject"
-          },
           "numberOfElements" : {
             "type" : "integer",
             "format" : "int32"
           },
+          "pageable" : {
+            "$ref" : "#/components/schemas/PageableObject"
+          },
           "empty" : {
             "type" : "boolean"
           }
@@ -820,6 +820,15 @@
           "sort" : {
             "$ref" : "#/components/schemas/SortObject"
           },
+<<<<<<< HEAD
+=======
+          "paged" : {
+            "type" : "boolean"
+          },
+          "unpaged" : {
+            "type" : "boolean"
+          },
+>>>>>>> 767326b (Update Java version to 21 and improve logging in ServerDetails)
           "pageNumber" : {
             "type" : "integer",
             "format" : "int32"
@@ -851,7 +860,6 @@
         }
       },
       "DepartmentSearchCriteriaDTO" : {
-        "required" : [ "page", "size" ],
         "type" : "object",
         "properties" : {
           "departmentCode" : {
@@ -878,7 +886,8 @@
               "$ref" : "#/components/schemas/SortItem"
             }
           }
-        }
+        },
+        "required" : [ "page", "size" ]
       },
       "APIResponsePageDepartmentDTO" : {
         "type" : "object",

pom.xml

@@ -15,7 +15,7 @@
     <description>department-api</description>
 
     <properties>
-        <java.version>17</java.version>
+        <java.version>21</java.version>
         <org.mapstruct.version>1.6.3</org.mapstruct.version>
         <lombok-mapstruct-binding.version>0.2.0</lombok-mapstruct-binding.version>
         <springdoc-openapi-starter-webmvc-ui.version>2.8.5</springdoc-openapi-starter-webmvc-ui.version>

src/main/java/com/ainigma100/departmentapi/filter/ServerDetails.java

@@ -1,7 +1,8 @@
 package com.ainigma100.departmentapi.filter;
 
 import lombok.AllArgsConstructor;
-import lombok.extern.slf4j.Slf4j;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.springframework.boot.context.event.ApplicationReadyEvent;
 import org.springframework.context.event.EventListener;
 import org.springframework.core.env.Environment;
@@ -14,38 +15,44 @@
 /**
  * Component for logging server details upon application startup.
  *
- * This class listens for the ApplicationReadyEvent to log important server details such as
- * the protocol, host, port, context path, active profiles, and the URL for accessing Swagger UI.
+ * <p>This class listens for the ApplicationReadyEvent to log important server details such as
+ * the protocol, host, port, context path, active profiles, and the URL for accessing Swagger UI.</p>
  */
-@Slf4j
 @AllArgsConstructor
 @Component
 public class ServerDetails {
 
+    private static final Logger log = LoggerFactory.getLogger(ServerDetails.class);
+
+
     private final Environment environment;
-    private static final String SERVER_SSL_KEY_STORE = "server.ssl.key-store";
-    private static final String SERVER_PORT = "server.port";
-    private static final String SERVER_SERVLET_CONTEXT_PATH = "server.servlet.context-path";
-    private static final String SPRINGDOC_SWAGGER_UI_PATH = "springdoc.swagger-ui.path";
-    private static final String DEFAULT_PROFILE = "default";
+
 
     @EventListener(ApplicationReadyEvent.class)
     public void logServerDetails() {
 
-        String protocol = Optional.ofNullable(environment.getProperty(SERVER_SSL_KEY_STORE)).map(key -> "https").orElse("http");
+        String serverSslKeyStore = "server.ssl.key-store";
+        String serverPortKey = "server.port";
+        String serverServletContextPath = "server.servlet.context-path";
+        String springdocSwaggerUiPath = "springdoc.swagger-ui.path";
+        String defaultProfile = "default";
+
+
+        String protocol = Optional.ofNullable(environment.getProperty(serverSslKeyStore)).map(key -> "https").orElse("http");
         String host = getServerIP();
-        String serverPort = Optional.ofNullable(environment.getProperty(SERVER_PORT)).orElse("8080");
-        String contextPath = Optional.ofNullable(environment.getProperty(SERVER_SERVLET_CONTEXT_PATH)).orElse("");
+        String serverPort = Optional.ofNullable(environment.getProperty(serverPortKey)).orElse("8080");
+        String contextPath = Optional.ofNullable(environment.getProperty(serverServletContextPath)).orElse("");
         String[] activeProfiles = Optional.of(environment.getActiveProfiles()).orElse(new String[0]);
-        String activeProfile = (activeProfiles.length > 0) ? String.join(",", activeProfiles) : DEFAULT_PROFILE;
-        String swaggerUI = Optional.ofNullable(environment.getProperty(SPRINGDOC_SWAGGER_UI_PATH)).orElse("/swagger-ui/index.html");
+        String activeProfile = (activeProfiles.length > 0) ? String.join(",", activeProfiles) : defaultProfile;
+        String swaggerUI = Optional.ofNullable(environment.getProperty(springdocSwaggerUiPath)).orElse("/swagger-ui/index.html");
 
         log.info(
                 """
-                \n
-                Access Swagger UI URL: {}://{}:{}{}{}
-                Active Profile: {}
-                """,
+                        
+                        
+                        Access Swagger UI URL: {}://{}:{}{}{}
+                        Active Profile: {}
+                        """,
                 protocol, host, serverPort, contextPath, swaggerUI,
                 activeProfile
         );