Add support for Hazelcast

This commit upgrades to Hazelcast 4.0.3, yet keeping compatibility with
Hazelcast 3.x.

Closes gh-20856
Closes gh-23475

spring-boot-tests/spring-boot-smoke-tests/spring-boot-smoke-test-hazelcast3/build.gradle

@@ -3,12 +3,12 @@ plugins {
 	id "org.springframework.boot.conventions"
 }
 
-description = "Spring Boot Hazelcast 4 smoke test"
+description = "Spring Boot Hazelcast 3 smoke test"
 
 configurations.all {
 	resolutionStrategy {
-		force "com.hazelcast:hazelcast:4.0.1"
-		force "com.hazelcast:hazelcast-spring:4.0.1"
+		force "com.hazelcast:hazelcast:3.12.8"
+		force "com.hazelcast:hazelcast-spring:3.12.8"
 	}
 }
 

spring-boot-tests/spring-boot-smoke-tests/spring-boot-smoke-test-hazelcast3/src/main/java/smoketest/hazelcast3/Country.java

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package smoketest.hazelcast4;
+package smoketest.hazelcast3;
 
 import java.io.Serializable;
 

spring-boot-tests/spring-boot-smoke-tests/spring-boot-smoke-test-hazelcast3/src/main/java/smoketest/hazelcast3/CountryRepository.java

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package smoketest.hazelcast4;
+package smoketest.hazelcast3;
 
 import org.springframework.cache.annotation.CacheConfig;
 import org.springframework.cache.annotation.Cacheable;

spring-boot-tests/spring-boot-smoke-tests/spring-boot-smoke-test-hazelcast3/src/main/java/smoketest/hazelcast3/SampleHazelcast3Application.java

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package smoketest.hazelcast4;
+package smoketest.hazelcast3;
 
 import com.hazelcast.spring.cache.HazelcastCacheManager;
 
@@ -27,10 +27,10 @@ import org.springframework.context.annotation.Bean;
 
 @SpringBootApplication
 @EnableCaching
-public class SampleHazelcast4Application {
+public class SampleHazelcast3Application {
 
 	public static void main(String[] args) {
-		SpringApplication.run(SampleHazelcast4Application.class, args);
+		SpringApplication.run(SampleHazelcast3Application.class, args);
 	}
 
 	@Bean

spring-boot-tests/spring-boot-smoke-tests/spring-boot-smoke-test-hazelcast3/src/main/resources/hazelcast.xml

@@ -1,7 +1,7 @@
 <hazelcast xmlns="http://www.hazelcast.com/schema/config"
 		   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 		   xsi:schemaLocation="http://www.hazelcast.com/schema/config
-           http://www.hazelcast.com/schema/config/hazelcast-config-4.0.xsd">
+           http://www.hazelcast.com/schema/config/hazelcast-config-3.12.xsd">
 	<map name="countries">
 		<time-to-live-seconds>600</time-to-live-seconds>
 	</map>

spring-boot-tests/spring-boot-smoke-tests/spring-boot-smoke-test-hazelcast3/src/test/java/smoketest/hazelcast3/SampleHazelcast4ApplicationTests.java

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package smoketest.hazelcast4;
+package smoketest.hazelcast3;
 
 import com.hazelcast.spring.cache.HazelcastCacheManager;
 import org.junit.jupiter.api.Test;

spring-boot-tests/spring-boot-smoke-tests/spring-boot-smoke-test-session/src/main/resources/hazelcast.xml

@@ -1,4 +1,4 @@
-<hazelcast xsi:schemaLocation="http://www.hazelcast.com/schema/config hazelcast-config-3.12.xsd"
+<hazelcast xsi:schemaLocation="http://www.hazelcast.com/schema/config hazelcast-config-4.0.xsd"
 		   xmlns="http://www.hazelcast.com/schema/config"
 		   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">