Migrate to Spring Boot 3.3.5 / 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 +1,9 @@
 # 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 3.3.x and runs on Java 21. It originally summarized Java 8 features
+and has since been migrated to a modern stack while preserving those examples.
 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 
+1) Java NIO methods 
 2) String operations
 3) Stream operations
 4) IntStream functions
@@ -11,7 +12,7 @@ In addition, it uses
 7) Optional datatype
 8) Foreach loops
 9) Default and Static methods in interface
-10) Java 8 LocalDateTime API
+10) `java.time` LocalDateTime API
 11) Pattern
 
 
@@ -76,20 +77,28 @@ GET /datetime
 
 ### Prerequisites
 
-1) Java sdk
+1) Java 21 (JDK 21)
 2) POSTMAN
 
-### Installing
+### Installing / Running
 
+Build and run with the Maven wrapper:
 
+```
+./mvnw clean package
+java -jar target/gs-spring-boot-0.1.0.jar
+```
+
+Or with the Gradle wrapper:
 
 ```
-1) Download or clone
-2) Import the project
-3) Run on location machine
-4) Open Postman, to call API's (  localhost:8080 )
+./gradlew bootRun
 ```
 
+Then open Postman or curl the endpoints at `http://localhost:8080`.
+
+> Note: the previous random-quote integration backed by `gturnquist-quoters.cfapps.io`
+> has been removed because that endpoint is no longer reachable.
 
 ## Helpful Links
 Spring:
@@ -125,7 +134,9 @@ https://dzone.com/articles/java-8-friday-goodies-new-new
 
 ## Built With
 
-* [Maven](https://maven.apache.org/) - Dependency Management
+* [Spring Boot 3.3.x](https://spring.io/projects/spring-boot)
+* [Java 21](https://openjdk.org/projects/jdk/21/)
+* [Maven](https://maven.apache.org/) or [Gradle](https://gradle.org/) for builds
 
 ## Authors
 

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:3.3.5")
     }
 }
 
@@ -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 = 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")
+    implementation("com.h2database:h2")
+    testImplementation("org.springframework.boot:spring-boot-starter-test")
 }
-

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,5 @@
-#Thu Mar 01 09:01:15 CST 2018
 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-8.10-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>3.3.5</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

@@ -5,7 +5,6 @@
 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;
@@ -26,18 +25,14 @@ 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());
     }
 
 
@@ -46,15 +41,6 @@ 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());
-        };
-    }
-
 
     @Autowired
     JdbcTemplate jdbcTemplate;
@@ -63,7 +49,7 @@ 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 +66,9 @@ 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()));
 
     }

src/main/java/hello/model/Greeting.java

@@ -1,21 +1,4 @@
 package hello.model;
 
-public class Greeting {
-    private final long id;
-    private final String content;
-
-    public Greeting(long id, String content) {
-        this.id = id;
-        this.content = content;
-    }
-
-
-    public long getId() {
-
-        return id;
-    }
-
-    public String getContent() {
-        return content;
-    }
+public record Greeting(long id, String content) {
 }