[DMAAP-CLIENT] First sonar issues review part2

update Copyright informations
fix checkstyle warning and fix code review comments
remove Prop

Issue-ID: DMAAP-1585
Change-Id: I445ca5d0888a555acbac70af7ed571be26d74f79
Signed-off-by: sliard <samuel.liard@gmail.com>
diff --git a/pom.xml b/pom.xml
index 3555fd4..2be51ac 100644
--- a/pom.xml
+++ b/pom.xml
@@ -142,20 +142,6 @@
                 </exclusion>
             </exclusions>
         </dependency>
-        <!-- Begin - Dependency on log4j for logging purpose -->
-        <!-- <dependency>
-          <groupId>log4j</groupId>
-          <artifactId>log4j</artifactId>
-          <version>1.2.17</version>
-        </dependency>
-        Log4j's enhanced pattern layout is shipped separately
-        <dependency>
-          <groupId>log4j</groupId>
-          <artifactId>apache-log4j-extras</artifactId>
-          <version>1.2.17</version>
-        </dependency> -->
-        <!-- End - Dependency on log4j for logging purpose -->
-	<!-- API, java.xml.bind module -->
 	<dependency>
 	    <groupId>jakarta.xml.bind</groupId>
 	    <artifactId>jakarta.xml.bind-api</artifactId>
@@ -300,6 +286,7 @@
                 <artifactId>maven-javadoc-plugin</artifactId>
                 <version>2.10.4</version>
                 <configuration>
+                    <failOnError>false</failOnError>
 	            <detectJavaApiLink>false</detectJavaApiLink>
                     <additionalparam>-Xdoclint:none</additionalparam>
                 </configuration>
@@ -325,13 +312,6 @@
                     </execution>
                 </executions>
             </plugin>
-	    <!--<plugin>
-                <artifactId>maven-compiler-plugin</artifactId>
-                <version>3.8.1</version>
-                <configuration>
-                    <release>11</release>
-                </configuration>
-	    </plugin>-->
             <plugin>
                 <groupId>org.jacoco</groupId>
                 <artifactId>jacoco-maven-plugin</artifactId>