Upgrade to Spring Boot 3.2.5 and Java 17

.gitignore

@@ -1 +1,4 @@
-/.idea/
+/.idea/
+/target/
+/build/
+/.gradle/

README.md

@@ -1,5 +1,5 @@
 # springboot-java8
-The project is made on spring boot. The project summarize the new features present in Java 8.
+The project is made on Spring Boot 3.x running on Java 17. The project summarizes the new features that were originally introduced 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 
@@ -76,9 +76,11 @@ GET /datetime
 
 ### Prerequisites
 
-1) Java sdk
+1) Java 17 SDK
 2) POSTMAN
 
+> Note: This project now targets Spring Boot 3.x, which requires Java 17 or newer.
+
 ### Installing
 
 

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:3.2.5")
     }
 }
 
@@ -14,19 +14,20 @@ apply plugin: 'org.springframework.boot'
 apply plugin: 'io.spring.dependency-management'
 
 bootJar {
-    baseName = 'gs-spring-boot'
-    version =  '0.1.0'
+    archiveBaseName = 'gs-spring-boot'
+    archiveVersion = '0.1.0'
 }
 
 repositories {
     mavenCentral()
 }
 
-sourceCompatibility = 1.8
-targetCompatibility = 1.8
+sourceCompatibility = 17
+targetCompatibility = 17
 
 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

@@ -1,6 +1,5 @@
-#Thu Mar 01 09:01:15 CST 2018
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.5-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.6-bin.zip

pom.xml

@@ -11,15 +11,10 @@
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
-        <version>2.0.2.RELEASE</version>
+        <version>3.2.5</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>17</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 {
@@ -26,33 +22,14 @@ public class Application implements CommandLineRunner {
     public static void main(String[] args) {
 
         ApplicationContext ctx = SpringApplication.run(Application.class, args);
-        
+
         System.out.println("Let's inspect the beans provided by Spring Boot:");
-        
+
         String[] beanNames = ctx.getBeanDefinitionNames();
         Arrays.sort(beanNames);
         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
@@ -80,8 +57,9 @@ public void run(String... args) throws Exception {
 
         log.info("Querying for customer records where first_name = 'Josh':");
         jdbcTemplate.query(
-                "SELECT id, first_name, last_name FROM customers WHERE first_name = ?", new Object[]{"Josh"},
-                (rs, rowNum) -> new Customer(rs.getLong("id"), rs.getString("first_name"), rs.getString("last_name"))
+                "SELECT id, first_name, last_name FROM customers WHERE first_name = ?",
+                (rs, rowNum) -> new Customer(rs.getLong("id"), rs.getString("first_name"), rs.getString("last_name")),
+                "Josh"
         ).forEach(customer -> log.info(customer.toString()));
 
     }