diff --git a/quartz-manager-parent/pom.xml b/quartz-manager-parent/pom.xml
index d6e33b0..77c8548 100644
--- a/quartz-manager-parent/pom.xml
+++ b/quartz-manager-parent/pom.xml
@@ -97,8 +97,8 @@
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-compiler-plugin</artifactId>
         <configuration>
-          <source>1.8</source>
-          <target>1.8</target>
+          <source>9</source>
+          <target>9</target>
         </configuration>
       </plugin>
       <plugin>
diff --git a/quartz-manager-parent/quartz-manager-starter-api/pom.xml b/quartz-manager-parent/quartz-manager-starter-api/pom.xml
index b6100c2..88c8e19 100644
--- a/quartz-manager-parent/quartz-manager-starter-api/pom.xml
+++ b/quartz-manager-parent/quartz-manager-starter-api/pom.xml
@@ -19,7 +19,7 @@
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
     <springdoc-openapi.version>1.5.12</springdoc-openapi.version>
-    <java.version>1.8</java.version>
+    <java.version>9</java.version>
   </properties>
 
   <dependencies>
diff --git a/quartz-manager-parent/quartz-manager-starter-persistence/pom.xml b/quartz-manager-parent/quartz-manager-starter-persistence/pom.xml
index 9023faa..ef6a269 100644
--- a/quartz-manager-parent/quartz-manager-starter-persistence/pom.xml
+++ b/quartz-manager-parent/quartz-manager-starter-persistence/pom.xml
@@ -5,20 +5,20 @@
     <artifactId>quartz-manager-parent</artifactId>
     <version>3.1.1-SNAPSHOT</version>
   </parent>
-  
+
   <artifactId>quartz-manager-starter-persistence</artifactId>
-  
+
   <name>Quartz Manager Starter Security</name>
   <description>Persist quartz jobs into a database</description>
-  
+
   <url>https://github.com/fabioformosa/quartz-manager</url>
   <properties>
     <main.basedir>${basedir}/../..</main.basedir>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
-    <java.version>1.8</java.version>
+    <java.version>9</java.version>
   </properties>
-  
+
   <dependencies>
     <dependency>
       <groupId>it.fabioformosa.quartz-manager</groupId>
@@ -47,5 +47,5 @@
       <scope>provided</scope>
     </dependency>
   </dependencies>
-  
+
 </project>
diff --git a/quartz-manager-parent/quartz-manager-starter-security/pom.xml b/quartz-manager-parent/quartz-manager-starter-security/pom.xml
index 2b46648..d3a6082 100644
--- a/quartz-manager-parent/quartz-manager-starter-security/pom.xml
+++ b/quartz-manager-parent/quartz-manager-starter-security/pom.xml
@@ -17,7 +17,7 @@
     <main.basedir>${basedir}/../..</main.basedir>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
-    <java.version>1.8</java.version>
+    <java.version>9</java.version>
     <springdoc-openapi.version>1.5.12</springdoc-openapi.version>
   </properties>
 
@@ -39,6 +39,10 @@
       <artifactId>spring-boot-configuration-processor</artifactId>
       <optional>true</optional>
     </dependency>
+    <dependency>
+      <groupId>org.springframework.boot</groupId>
+      <artifactId>spring-boot-starter-validation</artifactId>
+    </dependency>
 
     <!-- Misc -->
     <dependency>
@@ -99,6 +103,11 @@
       <artifactId>spring-boot-starter-web</artifactId>
       <scope>test</scope>
     </dependency>
+    <dependency>
+      <groupId>org.junit.jupiter</groupId>
+      <artifactId>junit-jupiter-params</artifactId>
+      <scope>test</scope>
+    </dependency>
   </dependencies>
 
 </project>
diff --git a/quartz-manager-parent/quartz-manager-starter-ui/pom.xml b/quartz-manager-parent/quartz-manager-starter-ui/pom.xml
index 168ccb5..00c6254 100644
--- a/quartz-manager-parent/quartz-manager-starter-ui/pom.xml
+++ b/quartz-manager-parent/quartz-manager-starter-ui/pom.xml
@@ -6,32 +6,32 @@
 		<artifactId>quartz-manager-parent</artifactId>
         <version>3.1.1-SNAPSHOT</version>
 	</parent>
-  
+
 	<artifactId>quartz-manager-starter-ui</artifactId>
-  
+
 	<name>Quartz Manager UI webjar</name>
 	<description>Webjar to import the quartz-manager frontend in your spring webapp</description>
-  
+
 	<url>https://github.com/fabioformosa/quartz-manager</url>
 	<properties>
 		<main.basedir>${basedir}/../..</main.basedir>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
-        <java.version>1.8</java.version>
+        <java.version>9</java.version>
         <frontend.folderName>quartz-manager-frontend</frontend.folderName>
         <node.version>v10.16.3</node.version>
         <npm.version>6.9.0</npm.version>
 	</properties>
-  
+
 	<dependencies>
 	</dependencies>
-  
+
    <profiles>
       <profile>
         <id>build-webjar</id>
         <build>
           <plugins>
-          
+
             <!-- STEP1: create a copy of the frontend sources from frontend project to this frontend builder project -->
             <plugin>
               <groupId>org.apache.maven.plugins</groupId>
@@ -60,7 +60,7 @@
                 </execution>
               </executions>
             </plugin>
-            
+
             <!-- STEP2: download npm, execute npm install, execute npm run build -->
             <plugin>
               <groupId>com.github.eirslett</groupId>
@@ -70,7 +70,7 @@
                 <workingDirectory>target/tmp</workingDirectory>
               </configuration>
               <executions>
-                
+
                 <execution>
                   <id>install node and npm</id>
                   <goals>
@@ -82,7 +82,7 @@
                     <npmVersion>${npm.version}</npmVersion>
                   </configuration>
                 </execution>
-                
+
                 <execution>
                   <id>npm install</id>
                   <goals>
@@ -93,7 +93,7 @@
                     <arguments>install</arguments>
                   </configuration>
                 </execution>
-                
+
                 <execution>
                   <id>npm run build</id>
                   <goals>
@@ -104,10 +104,10 @@
                     <arguments>run build</arguments>
                   </configuration>
                 </execution>
-                
+
               </executions>
             </plugin>
-            
+
             <!-- STEP3: move built artifacts into the META-INF folder -->
             <plugin>
               <artifactId>maven-antrun-plugin</artifactId>
@@ -135,5 +135,5 @@
         </build>
       </profile>
    </profiles>
-  
+
 </project>
diff --git a/quartz-manager-parent/quartz-manager-web-showcase/pom.xml b/quartz-manager-parent/quartz-manager-web-showcase/pom.xml
index 2efb97c..982e3ba 100644
--- a/quartz-manager-parent/quartz-manager-web-showcase/pom.xml
+++ b/quartz-manager-parent/quartz-manager-web-showcase/pom.xml
@@ -19,7 +19,7 @@
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
 	    <springfox.version>2.9.2</springfox.version>
-		<java.version>1.8</java.version>
+		<java.version>9</java.version>
 	</properties>
 
 	<dependencies>