Fix promotion issue caused by javadoc version (#26)

Author: zhengjl

api/pom.xml

@@ -556,6 +556,18 @@ href='http://www.oracle.com/technetwork/java/index-jsp-137004.html'><i>Metro Web
                 </plugins>
             </build>
         </profile>
+        <profile>
+            <id>jvnet-release</id>
+            <build>
+                <plugins>
+                    <plugin>
+                        <groupId>org.apache.maven.plugins</groupId>
+                        <artifactId>maven-javadoc-plugin</artifactId>
+                        <version>3.0.0-M1</version>
+                    </plugin>
+                </plugins>
+            </build>
+        </profile>
     </profiles>
 
 </project>