java 1.8 AL1 is deprecated

Author: jeromevdl

examples/powertools-examples-core/gradle/build.gradle

@@ -9,8 +9,8 @@ wrapper {
 }
 
 compileJava {
-    sourceCompatibility = "1.8"
-    targetCompatibility = "1.8"
+    sourceCompatibility = "11"
+    targetCompatibility = "11"
 
     ajc {
         enabled = true

examples/powertools-examples-core/kotlin/build.gradle.kts

@@ -21,19 +21,6 @@ dependencies {
     implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8")
 }
 
-tasks.compileKotlin {
-    kotlinOptions {
-        jvmTarget = "1.8"
-    }
-}
-
-tasks.compileTestKotlin {
-    kotlinOptions {
-        jvmTarget = "1.8"
-    }
-}
-
-// If using JDK 11 or higher, use the following instead:
-//kotlin {
-//    jvmToolchain(11)
-//}
+kotlin {
+    jvmToolchain(11)
+}

examples/powertools-examples-core/sam/pom.xml

@@ -11,8 +11,8 @@
 
     <properties>
         <log4j.version>2.22.1</log4j.version>
-        <maven.compiler.source>1.8</maven.compiler.source>
-        <maven.compiler.target>1.8</maven.compiler.target>
+        <maven.compiler.source>11</maven.compiler.source>
+        <maven.compiler.target>11</maven.compiler.target>
     </properties>
 
     <dependencies>

powertools-e2e-tests/src/test/java/software/amazon/lambda/powertools/testutils/Infrastructure.java

@@ -513,7 +513,7 @@ private Builder() {
 
         private JavaRuntime mapRuntimeVersion(String environmentVariableName) {
             String javaVersion = System.getenv(environmentVariableName); // must be set in GitHub actions
-            JavaRuntime ret = null;
+            JavaRuntime ret;
             if (javaVersion == null) {
                 throw new IllegalArgumentException(environmentVariableName + " is not set");
             }

powertools-e2e-tests/src/test/java/software/amazon/lambda/powertools/testutils/JavaRuntime.java

@@ -17,7 +17,6 @@
 import software.amazon.awscdk.services.lambda.Runtime;
 
 public enum JavaRuntime {
-    JAVA8("java8", Runtime.JAVA_8, "1.8"),
     JAVA8AL2("java8.al2", Runtime.JAVA_8_CORRETTO, "1.8"),
     JAVA11("java11", Runtime.JAVA_11, "11"),
     JAVA17("java17", Runtime.JAVA_17, "17"),