Wicket updated to version 9 (#5928)

Co-authored-by: Andrea Del Bene <[email protected]>

frameworks/Java/wicket/pom.xml

@@ -22,8 +22,8 @@
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 		<maven.compiler.source>11</maven.compiler.source>
 		<maven.compiler.target>11</maven.compiler.target>
-		<wicket.version>8.4.0</wicket.version>
-		<slf4j.version>1.8.0-beta4</slf4j.version>
+                <slf4j.version>1.7.25</slf4j.version>
+		<wicket.version>9.0.0</wicket.version>
 	</properties>
 	<dependencies>
 		<!-- WICKET DEPENDENCIES -->
@@ -44,14 +44,9 @@
 		<!-- LOGGING DEPENDENCIES - LOG4J -->
 		<dependency>
 			<groupId>org.slf4j</groupId>
-			<artifactId>slf4j-log4j12</artifactId>
+			<artifactId>slf4j-simple</artifactId>
 			<version>${slf4j.version}</version>
 		</dependency>
-		<dependency>
-			<groupId>log4j</groupId>
-			<artifactId>log4j</artifactId>
-			<version>1.2.17</version>
-		</dependency>
 
 		<!-- JUNIT DEPENDENCY FOR TESTING -->
 		<dependency>