fix(build): fix dokka plugin

Author: fhussonnois

clients/pom.xml

@@ -53,4 +53,5 @@
             <artifactId>logback-core</artifactId>
         </dependency>
     </dependencies>
+
 </project>

examples/pom.xml

@@ -24,4 +24,5 @@
             <scope>compile</scope>
         </dependency>
     </dependencies>
+
 </project>

pom.xml

@@ -68,6 +68,7 @@
 
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <kotlin.compiler.incremental>true</kotlin.compiler.incremental>
         <kotlin.version>1.3.72</kotlin.version>
         <kotlinx.version>1.3.8</kotlinx.version>
         <kotlin.code.style>official</kotlin.code.style>
@@ -110,7 +111,7 @@
                     <plugin>
                         <groupId>org.apache.maven.plugins</groupId>
                         <artifactId>maven-source-plugin</artifactId>
-                        <version>2.2.1</version>
+                        <version>3.2.1</version>
                         <executions>
                             <execution>
                                 <id>attach-sources</id>
@@ -126,12 +127,42 @@
                         <version>${dokka.version}</version>
                         <executions>
                             <execution>
-                                <phase>pre-site</phase>
+                                <phase>prepare-package</phase>
                                 <goals>
                                     <goal>dokka</goal>
+                                    <!-- not work with JDK 11 (https://github.com/Kotlin/dokka/issues/294)
+                                    <goal>javadoc</goal>
+                                    <goal>javadocJar</goal>
+                                    -->
                                 </goals>
                             </execution>
                         </executions>
+                        <configuration>
+                            <dokkaPlugins>
+                                <plugin>
+                                    <groupId>org.jetbrains.dokka</groupId>
+                                    <artifactId>kotlin-as-java-plugin</artifactId>
+                                    <version>${dokka.version}</version>
+                                </plugin>
+                            </dokkaPlugins>
+                        </configuration>
+                    </plugin>
+                    <plugin>
+                        <groupId>org.apache.maven.plugins</groupId>
+                        <artifactId>maven-jar-plugin</artifactId>
+                        <executions>
+                            <execution>
+                                <id>javadoc-jar</id>
+                                <phase>package</phase>
+                                <goals>
+                                    <goal>jar</goal>
+                                </goals>
+                                <configuration>
+                                    <classifier>javadoc</classifier>
+                                    <classesDirectory>${project.basedir}/target/dokka</classesDirectory>
+                                </configuration>
+                            </execution>
+                        </executions>
                     </plugin>
                 </plugins>
             </build>