Downgrade required java version to 8
diff --git a/empire-db-examples/empire-db-example-spring-boot/pom.xml b/empire-db-examples/empire-db-example-spring-boot/pom.xml
index 8edea72..71376ea 100644
--- a/empire-db-examples/empire-db-example-spring-boot/pom.xml
+++ b/empire-db-examples/empire-db-example-spring-boot/pom.xml
@@ -15,9 +15,9 @@
   
   <properties>
     <!-- The spring-boot-starter-parent chooses fairly conservative Java compatibility. If you want to follow our recommendation and use a later Java version you can add a java.version property -->
-    <java.version>11</java.version>
-    <maven.compiler.source>11</maven.compiler.source>
-    <maven.compiler.target>11</maven.compiler.target>
+    <java.version>8</java.version>
+    <maven.compiler.source>8</maven.compiler.source>
+    <maven.compiler.target>8</maven.compiler.target>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
   </properties>