Upgrade to Spring Boot 3.4.5 and Java 21

.mvn/wrapper/maven-wrapper.properties

@@ -1 +1 @@
-distributionUrl=https://repo1.maven.org/maven2/org/apache/maven/apache-maven/3.3.9/apache-maven-3.3.9-bin.zip
+distributionUrl=https://repo1.maven.org/maven2/org/apache/maven/apache-maven/3.9.9/apache-maven-3.9.9-bin.zip

README.md

@@ -1,8 +1,8 @@
 # springboot-java8
-The project is made on spring boot. The project summarize the new features present in Java 8.
-It contain list of harcoded topics list. You can call the apis's with POSTMAN to add,delete,update Topic list
-In addition, it uses 
-1) Java 8 NIO methods 
+A Spring Boot project demonstrating Java features including streams, lambdas, NIO, and more.
+It contains a list of hardcoded topics. You can call the APIs with POSTMAN to add, delete, update the Topic list.
+In addition, it uses:
+1) Java NIO methods
 2) String operations
 3) Stream operations
 4) IntStream functions
@@ -11,14 +11,32 @@ In addition, it uses
 7) Optional datatype
 8) Foreach loops
 9) Default and Static methods in interface
-10) Java 8 LocalDateTime API
+10) Java LocalDateTime API
 11) Pattern
 
 
 
+## Requirements
+
+- **Java 21**
+- **Spring Boot 3.4.5**
+- **Maven 3.9.9** (via Maven Wrapper) or **Gradle 8.12** (via Gradle Wrapper)
+
 ## Getting Started
-1) Download or clone the project with link 
-(https://github.com/RehmanMuradAli/springboot-java8/)
+
+### Build & Run with Maven
+```bash
+./mvnw clean package
+java -jar target/gs-spring-boot-0.1.0.jar
+```
+
+### Build & Run with Gradle
+```bash
+./gradlew build
+java -jar build/libs/gs-spring-boot-0.1.0.jar
+```
+
+The application starts on `http://localhost:8080`.
 
 ## Available API's
 
@@ -67,41 +85,22 @@ File Operations on Topic List
 ```
 GET /topic/file/operation
 ```
-Java 8 Date Time example
+Java Date Time example
 ```
 GET /datetime
 ```
 
 
 
-### Prerequisites
-
-1) Java sdk
-2) POSTMAN
-
-### Installing
-
-
-
-```
-1) Download or clone
-2) Import the project
-3) Run on location machine
-4) Open Postman, to call API's (  localhost:8080 )
-```
-
-
 ## Helpful Links
 Spring:
 
 https://spring.io/guides
 
-Java 8: 
+Java:
 
 http://www.baeldung.com/java-8-functional-interfaces
 
-http://winterbe.com/posts/2015/05/22/java8-concurrency-tutorial-atomic-concurrent-map-examples/
-
 https://docs.oracle.com/javase/tutorial/java/IandI/defaultmethods.html
 
 http://winterbe.com/posts/2014/07/31/java8-stream-tutorial-examples/
@@ -126,9 +125,8 @@ https://dzone.com/articles/java-8-friday-goodies-new-new
 ## Built With
 
 * [Maven](https://maven.apache.org/) - Dependency Management
+* [Spring Boot](https://spring.io/projects/spring-boot) - Application Framework
 
 ## Authors
 
-* **Rehman Murad Ali** 
-
-
+* **Rehman Murad Ali**

build.gradle

@@ -3,7 +3,7 @@ buildscript {
         mavenCentral()
     }
     dependencies {
-        classpath("org.springframework.boot:spring-boot-gradle-plugin:2.0.2.RELEASE")
+        classpath("org.springframework.boot:spring-boot-gradle-plugin:3.4.5")
     }
 }
 
@@ -22,11 +22,13 @@ repositories {
     mavenCentral()
 }
 
-sourceCompatibility = 1.8
-targetCompatibility = 1.8
+sourceCompatibility = 21
+targetCompatibility = 21
 
 dependencies {
-    compile("org.springframework.boot:spring-boot-starter-web")
-    testCompile("junit:junit")
+    implementation("org.springframework.boot:spring-boot-starter-web")
+    implementation("org.springframework.boot:spring-boot-starter-jdbc")
+    runtimeOnly("com.h2database:h2")
+    testImplementation("junit:junit")
 }
 

gradle/wrapper/gradle-wrapper.properties

@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.6-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.12-bin.zip

pom.xml

@@ -5,21 +5,16 @@
 
     <groupId>org.springframework</groupId>
     <artifactId>gs-spring-boot</artifactId>
-    <packaging>pom</packaging>
+    <packaging>jar</packaging>
     <version>0.1.0</version>
 
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
-        <version>2.0.2.RELEASE</version>
+        <version>3.4.5</version>
     </parent>
 
     <dependencies>
-        <dependency>
-            <groupId>org.springframework.boot</groupId>
-            <artifactId>spring-boot-properties-migrator</artifactId>
-            <scope>runtime</scope>
-        </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-web</artifactId>
@@ -35,7 +30,7 @@
     </dependencies>
 
     <properties>
-        <java.version>1.8</java.version>
+        <java.version>21</java.version>
     </properties>
 
 

src/main/java/hello/Application.java

@@ -5,18 +5,14 @@
 import java.util.stream.Collectors;
 
 import hello.model.Customer;
-import hello.model.Quote;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.CommandLineRunner;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
-import org.springframework.boot.web.client.RestTemplateBuilder;
 import org.springframework.context.ApplicationContext;
-import org.springframework.context.annotation.Bean;
 import org.springframework.jdbc.core.JdbcTemplate;
-import org.springframework.web.client.RestTemplate;
 
 @SpringBootApplication
 public class Application implements CommandLineRunner {
@@ -34,25 +30,6 @@ public static void main(String[] args) {
         for (String beanName : beanNames) {
             System.out.println(beanName);
         }
-
-        RestTemplate restTemplate =  new RestTemplate();
-        Quote quote = restTemplate.getForObject("http://gturnquist-quoters.cfapps.io/api/random", Quote.class);
-        log.info(quote.toString());
-    }
-
-
-    @Bean
-    public RestTemplate restTemplate(RestTemplateBuilder builder) {
-        return builder.build();
-    }
-
-    @Bean
-    public CommandLineRunner run(RestTemplate restTemplate) throws Exception {
-        return args -> {
-            Quote quote = restTemplate.getForObject(
-                    "http://gturnquist-quoters.cfapps.io/api/random", Quote.class);
-            log.info(quote.toString());
-        };
     }
 
 
@@ -63,7 +40,7 @@ public CommandLineRunner run(RestTemplate restTemplate) throws Exception {
     public void run(String... args) throws Exception {
         log.info("Creating tables");
 
-        jdbcTemplate.execute("DROP TABLE customers IF EXISTS");
+        jdbcTemplate.execute("DROP TABLE IF EXISTS customers");
         jdbcTemplate.execute("CREATE TABLE customers(id SERIAL, first_name VARCHAR(255), last_name VARCHAR(255))");
 
         // Split up the array of whole names into an array of first/last names