fix pom error in webmagic-script

webmagic-scripts/pom.xml

@@ -57,7 +57,7 @@
     </dependencies>
 
     <build>
-        <sourceDirectory>${project.basedir}/src/main/kotlin,${project.basedir}/src/main/groovy,${project.basedir}/src/main/java</sourceDirectory>
+        <sourceDirectory>${project.basedir}/src/main/java</sourceDirectory>
         <plugins>
             <plugin>
                 <artifactId>maven-compiler-plugin</artifactId>
@@ -87,6 +87,25 @@
                     </archive>
                 </configuration>
             </plugin>
+            <plugin>
+                <groupId>org.codehaus.mojo</groupId>
+                <artifactId>build-helper-maven-plugin</artifactId>
+                <version>3.0.0</version>
+                <executions>
+                    <execution>
+                        <id>add-source</id>
+                        <phase>generate-sources</phase>
+                        <goals>
+                            <goal>add-source</goal>
+                        </goals>
+                        <configuration>
+                            <sources>
+                                <source>${project.basedir}/src/main/kotlin</source>
+                            </sources>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
         </plugins>
     </build>