sonar vulnerabilities fixes

Author: ishaileshmishra

pom.xml

@@ -37,7 +37,7 @@
         <json-simple-version>1.1.1</json-simple-version>
         <maven-site-plugin.version>3.3</maven-site-plugin.version>
         <maven-gpg-plugin.version>1.5</maven-gpg-plugin.version>
-        <maven-compiler-plugin.version>3.8.0</maven-compiler-plugin.version>
+        <maven-compiler-plugin.version>3.8.1</maven-compiler-plugin.version>
         <nexus-staging-maven-plugin.version>1.6.7</nexus-staging-maven-plugin.version>
         <maven-release-plugin.version>2.5.3</maven-release-plugin.version>
         <json-version>20210307</json-version>
@@ -230,6 +230,11 @@
                 <version>3.3</version>
             </plugin>
 
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-enforcer-plugin</artifactId>
+                <version>3.0.0-M2</version>
+            </plugin>
             <!--
             Signs all of a project's attached artifacts with GnuPG.
             You need to have previously configured the default key.
@@ -258,10 +263,10 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
-                <version>3.8.0</version>
+                <version>${maven-compiler-plugin.version}</version>
                 <configuration>
-                    <source>${java.version}</source>
-                    <target>${java.version}</target>
+                    <source>1.8</source>
+                    <target>1.8</target>
                     <compilerArgument>-Xlint:all</compilerArgument>
                     <showWarnings>true</showWarnings>
                     <showDeprecation>true</showDeprecation>