workaround Travis javadoc build

Author: mikesamuel

scripts/build_for_travis.sh

@@ -14,13 +14,16 @@ if echo $TRAVIS_JDK_VERSION | egrep -q '(jdk|jre)[67]($|[^0-9])'; then
  # The main library only uses jdk6 compatible dependencies,
  # but Guava 21.0 is compatibility with jdk 7.
  COMMON_FLAGS="$COMMON_FLAGS -Dguava.version=20.0"
-
+fi
+if echo $TRAVIS_JDK_VERSION | egrep -q '(jdk|jre)9($|[^0-9])'; then
+ ;
+else
  # Older versions of javadoc barf on -Xdoclint flags used
  # to configure the maven-javadoc-plugin.
+ # TODO: Newer versions barf on modules for some reason.
  COMMON_FLAGS="$COMMON_FLAGS -Dmaven.javadoc.skip=true"
 fi
 
-
 echo "*** TRAVIS_JDK_VERSION=$TRAVIS_JDK_VERSION COMMON_FLAGS=($COMMON_FLAGS) IS_LEGACY=$IS_LEGACY"
 
 mvn install -DskipTests=true $COMMON_FLAGS