Missing JAVA_HOME

P/Sd1/math/V1/pom.xml

@@ -41,13 +41,14 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-javadoc-plugin</artifactId>
-                <version>3.0.1</version>
+                <version>3.1.0</version>
                 <configuration>
                     <linksource>true</linksource>
                     <additionalOptions>
                         <additionalOption>-html5 --allow-script-in-comments -header
                             <![CDATA['<script type="text/javascript" src="https://freedocs.mi.hdm-stuttgart.de/mathjax/MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script>']]></additionalOption>
-                    </additionalOptions>
+	            </additionalOptions>
+	            <javadocExecutable>${java.home}/bin/javadoc</javadocExecutable>
                 </configuration>
             </plugin>
             <plugin>
@@ -55,8 +56,8 @@
                 <artifactId>maven-compiler-plugin</artifactId>
                 <version>3.7.0</version>
                 <configuration>
-                    <source>1.9</source>
-                    <target>1.9</target>
+                    <source>11</source>
+                    <target>11</target>
                 </configuration>
             </plugin>