Fixed JavaDoc aggregation not to fail in multi-project builds.

parent/pom.xml

@@ -185,15 +185,25 @@
 					<plugin>
 						<groupId>org.apache.maven.plugins</groupId>
 						<artifactId>maven-javadoc-plugin</artifactId>
-						<version>2.8</version>
+						<version>2.9</version>
 						<executions>
 							<execution>
+								<id>jar-javadoc</id>
 								<goals>
-									<goal>aggregate</goal>
 									<goal>jar</goal>
 								</goals>
 								<phase>package</phase>
 							</execution>
+							<execution>
+								<id>aggregate-javadoc</id>
+								<goals>
+									<goal>aggregate</goal>
+								</goals>
+								<phase>package</phase>
+								<configuration>
+									<failOnError>false</failOnError>
+								</configuration>
+							</execution>
 						</executions>
 						<configuration>
 							<breakiterator>true</breakiterator>