Upgrade springboot-java8 to Java 17 LTS

.github/workflows/build.yml

@@ -0,0 +1,23 @@
+name: Build
+on: [push, pull_request]
+jobs:
+  maven:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: '17'
+          cache: maven
+      - run: mvn -B -V clean package
+  gradle:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: '17'
+      - uses: gradle/actions/setup-gradle@v3
+      - run: ./gradlew -V clean bootJar

.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://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.9.6/apache-maven-3.9.6-bin.zip

build.gradle

@@ -3,7 +3,8 @@ buildscript {
         mavenCentral()
     }
     dependencies {
-        classpath("org.springframework.boot:spring-boot-gradle-plugin:2.0.2.RELEASE")
+        classpath("org.springframework.boot:spring-boot-gradle-plugin:2.7.18")
+        classpath("io.spring.gradle:dependency-management-plugin:1.0.15.RELEASE")
     }
 }
 
@@ -14,19 +15,28 @@ 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
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(17)
+    }
+}
 
-dependencies {
-    compile("org.springframework.boot:spring-boot-starter-web")
-    testCompile("junit:junit")
+tasks.withType(JavaCompile) {
+    options.release = 17
 }
 
+dependencies {
+    implementation("org.springframework.boot:spring-boot-starter-web")
+    implementation("org.springframework.boot:spring-boot-starter-jdbc")
+    implementation("javax.annotation:javax.annotation-api:1.3.2")
+    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-7.6.4-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>2.7.18</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>
@@ -32,15 +27,31 @@
             <groupId>com.h2database</groupId>
             <artifactId>h2</artifactId>
         </dependency>
+        <dependency>
+            <groupId>javax.annotation</groupId>
+            <artifactId>javax.annotation-api</artifactId>
+            <version>1.3.2</version>
+        </dependency>
     </dependencies>
 
     <properties>
-        <java.version>1.8</java.version>
+        <java.version>17</java.version>
+        <maven.compiler.release>17</maven.compiler.release>
+        <maven-compiler-plugin.version>3.13.0</maven-compiler-plugin.version>
+        <maven-surefire-plugin.version>3.5.6</maven-surefire-plugin.version>
     </properties>
 
 
     <build>
         <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>${maven-compiler-plugin.version}</version>
+                <configuration>
+                    <release>${maven.compiler.release}</release>
+                </configuration>
+            </plugin>
             <plugin>
                 <groupId>org.springframework.boot</groupId>
                 <artifactId>spring-boot-maven-plugin</artifactId>

src/main/java/hello/Application.java

@@ -17,11 +17,13 @@
 import org.springframework.context.annotation.Bean;
 import org.springframework.jdbc.core.JdbcTemplate;
 import org.springframework.web.client.RestTemplate;
+import org.springframework.web.client.RestClientException;
 
 @SpringBootApplication
 public class Application implements CommandLineRunner {
 
     private static final Logger log = LoggerFactory.getLogger(Application.class);
+    private static final String QUOTERS_URL = "http://gturnquist-quoters.cfapps.io/api/random";
 
     public static void main(String[] args) {
 
@@ -36,8 +38,7 @@ public static void main(String[] args) {
         }
 
         RestTemplate restTemplate =  new RestTemplate();
-        Quote quote = restTemplate.getForObject("http://gturnquist-quoters.cfapps.io/api/random", Quote.class);
-        log.info(quote.toString());
+        logRandomQuote(restTemplate);
     }
 
 
@@ -49,12 +50,23 @@ public RestTemplate restTemplate(RestTemplateBuilder builder) {
     @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());
+            logRandomQuote(restTemplate);
         };
     }
 
+    private static void logRandomQuote(RestTemplate restTemplate) {
+        try {
+            Quote quote = restTemplate.getForObject(QUOTERS_URL, Quote.class);
+            if (quote == null) {
+                log.warn("Unable to retrieve random quote from {}", QUOTERS_URL);
+            } else {
+                log.info(quote.toString());
+            }
+        } catch (RestClientException ex) {
+            log.warn("Unable to retrieve random quote from {}", QUOTERS_URL, ex);
+        }
+    }
+
 
     @Autowired
     JdbcTemplate jdbcTemplate;