Fix javadoc generation with JDK 11

Author: henryju

api/src/main/java/org/sonarsource/scanner/api/ScanProperties.java

@@ -20,7 +20,7 @@
 package org.sonarsource.scanner.api;
 
 /**
- * Most commonly used properties for a SonarQube analysis. These properties are passed to {@link EmbeddedScanner#runAnalysis(java.util.Properties)}.
+ * Most commonly used properties for a SonarQube analysis. These properties are passed to EmbeddedScanner#runAnalysis(java.util.Properties).
  * See <a href="http://docs.sonarqube.org/display/SONAR/Analysis+Parameters">documentation</a> for more properties.
  *
  * @since 2.2

api/src/main/java/org/sonarsource/scanner/api/ScannerProperties.java

@@ -20,7 +20,7 @@
 package org.sonarsource.scanner.api;
 
 /**
- * Mostly used properties that can be passed to {@link EmbeddedScanner#addGlobalProperties(java.util.Properties)}.
+ * Mostly used properties that can be passed to EmbeddedScanner#addGlobalProperties(java.util.Properties).
  * See <a href="http://docs.sonarqube.org/display/SONAR/Analysis+Parameters">documentation</a> for more properties.
  *
  * @since 2.2

pom.xml

@@ -64,7 +64,10 @@
           <plugin>
             <groupId>org.apache.maven.plugins</groupId>
             <artifactId>maven-javadoc-plugin</artifactId>
-            <version>2.9</version>
+	    <version>3.1.0</version>
+            <configuration>
+              <source>8</source>
+            </configuration>
             <executions>
               <execution>
                 <id>attach-javadocs</id>