Merge pull request #80 from catenax-ng/fix/57-code-style

chore|style: code-style validation through checkstyle and reformat according to tractus-x style guide

NOTICE.md

@@ -63,7 +63,6 @@ The KA-EDC build and runtime platform is relying on:
 * [Java Development Kit (JDK >=11 - license depends on chosen provider)](https://de.wikipedia.org/wiki/Java_Development_Kit) 
 * [Apache Maven >=3.8 (Apache License 2.0)](https://maven.apache.org) 
 * [Eclipse Dash (Eclipse Public License 2.0)](https://github.com/eclipse/dash-licenses)
-* [CycloneDX 1.4 (Apache License 2.0)](https://github.com/CycloneDX)
 * [Docker Engine >= 20.10.17 (Apache License 2.0)]() 
 * [Helm (Apache License 2.0)](https://helm.sh/) 
 

agent-plane/agent-plane-protocol/pom.xml

@@ -20,7 +20,7 @@
 <!--
   Pom for building the agent plane protocols extensions
 -->
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://maven.apache.org/POM/4.0.0"
          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <parent>
         <groupId>org.eclipse.tractusx.agents.edc</groupId>
@@ -111,8 +111,8 @@
                 <artifactId>maven-surefire-plugin</artifactId>
             </plugin>
             <plugin>
-                <groupId>com.diffplug.spotless</groupId>
-                <artifactId>spotless-maven-plugin</artifactId>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-checkstyle-plugin</artifactId>
             </plugin>
         </plugins>
     </build>