Fix build on jenkins

On Jenkins we also use Maven 3.6.3
we need specified maven.compiler.target/source at least

src/it/projects/MJAVADOC-642/pom.xml

@@ -23,6 +23,8 @@
     <url>https://issues.apache.org/jira/browse/MJAVADOC-642</url>
 
     <properties>
+        <maven.compiler.source>1.8</maven.compiler.source>
+        <maven.compiler.target>1.8</maven.compiler.target>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     </properties>
 

src/it/projects/MJAVADOC-642/src/main/java/mjavadoc642/Main.java

@@ -23,6 +23,12 @@
  * This is the main class.
  */
 public final class Main {
+
+    /**
+     * Mising description on auto generated constructor cause javadoc warrning.
+     */
+    Main() {}
+
     /**
      * This is the main method.
      *

src/it/projects/MJAVADOC-642_cmdline/pom.xml

@@ -23,6 +23,8 @@
     <url>https://issues.apache.org/jira/browse/MJAVADOC-642</url>
 
     <properties>
+        <maven.compiler.source>1.8</maven.compiler.source>
+        <maven.compiler.target>1.8</maven.compiler.target>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     </properties>
 

src/it/projects/MJAVADOC-642_cmdline/src/main/java/mjavadoc642/Main.java

@@ -23,6 +23,12 @@
  * This is the main class.
  */
 public final class Main {
+
+    /**
+     * Mising description on auto generated constructor cause javadoc warrning.
+     */
+    Main() {}
+
     /**
      * This is the main method.
      *

src/it/projects/MJAVADOC-770/src/main/java/mjavadoc770/Main.java

@@ -23,6 +23,12 @@
  * This is the main class.
  */
 public final class Main {
+
+    /**
+     * Mising description on auto generated constructor cause javadoc warrning.
+     */
+    Main() {}
+
     /**
      * This is the main method.
      *