Build with Java (JDK) 17.

build.gradle

@@ -41,6 +41,12 @@ allprojects {
   }
 }
 
+subprojects {
+  plugins.withType(JavaPlugin) {
+    sourceCompatibility = JavaVersion.VERSION_17
+  }
+}
+
 description = 'Spring Test Framework for Apache Geode and VMware Tanzu GemFire using Spring Data.'
 
 //ext['spring.version'] = "$springVersion"

pom.xml

@@ -78,10 +78,11 @@
 	</developers>
 
 	<properties>
-		<java.version>1.8</java.version>
+		<java.version>17</java.version>
 		<maven-compiler-plugin.version>3.3</maven-compiler-plugin.version>
 		<maven-surefire-plugin.version>2.19.1</maven-surefire-plugin.version>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<source.level>${java.version}</source.level>
 		<apache-geode.version>1.14.0</apache-geode.version>
 		<assertj.version>3.21.0</assertj.version>
 		<junit.version>4.13.2</junit.version>