Debug Travis CI build

Make sure javadoc builds on JDK11.
Add some trace to figure out why local jdk7 build differs from TRAVIS.

Pin a modern protobuf version since there was an out of bounds decoder CVE
in trusted-types/pom.xml.

Author: mikesamuel

parent/pom.xml

@@ -171,6 +171,13 @@ application while protecting against XSS.
             <!-- The Javadoc that ships with JDK 8 is spammy.
                  http://docs.oracle.com/javase/8/docs/technotes/tools/unix/javadoc.html#BEJEFABE -->
             <additionalparam>-Xdoclint:-missing</additionalparam>
+            <!-- workaround for https://bugs.openjdk.java.net/browse/JDK-8212233 -->
+            <javaApiLinks>
+              <property>
+                <name>foo</name>
+                <value>bar</value>
+              </property>
+            </javaApiLinks>
           </configuration>
         </plugin>
         <plugin>
@@ -234,6 +241,12 @@ application while protecting against XSS.
         <version>[2.0.1,)</version>
         <scope>provided</scope>
       </dependency>
+      <dependency>
+        <groupId>com.google.protobuf</groupId>
+        <artifactId>protobuf-java</artifactId>
+        <version>[3.7.0,)</version>
+        <scope>provided</scope>
+      </dependency>
       <dependency>
         <groupId>junit</groupId>
         <artifactId>junit</artifactId>

scripts/build_for_travis.sh

@@ -20,6 +20,7 @@ if echo $TRAVIS_JDK_VERSION | egrep -q 'jdk[67]'; then
     COMMON_FLAGS="$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
 
@@ -32,5 +33,5 @@ else
     mvn                             -f aggregate/pom.xml       source:jar javadoc:jar verify $COMMON_FLAGS \
     && mvn -Dguava.version=27.1-jre -f aggregate/pom.xml clean source:jar javadoc:jar verify $COMMON_FLAGS \
     && mvn jacoco:report coveralls:report \
-    && mvn org.sonatype.ossindex.maven:ossindex-maven-plugin:audit $COMMON_FLAGS
+    && mvn org.sonatype.ossindex.maven:ossindex-maven-plugin:audit -f aggregate $COMMON_FLAGS
 fi