Add ARM64 job in Travis-CI

.travis.yml

@@ -4,7 +4,11 @@ dist: trusty
 language: java
 
 install:
-  - if [ "${TRAVIS_CPU_ARCH}" == "arm64" ]; then sudo apt-get install openjdk-11-jdk && export JAVA_HOME=/usr/lib/jvm/java-11-openjdk-arm64 && export PATH=$JAVA_HOME:$PATH && sudo apt-get install libltdl-dev; fi || true
+  - if [ "${TRAVIS_CPU_ARCH}" == "arm64" ]; then 
+      sudo apt-get install openjdk-11-jdk libltdl-dev;
+      export JAVA_HOME=/usr/lib/jvm/java-11-openjdk-arm64;
+      export PATH=$JAVA_HOME:$PATH; 
+    fi || true
   - export APACHE_ANT_BASE=$(curl http://apache.mirror.iphh.net/ant/binaries/ | grep "apache-ant-1.9..*-bin.tar.gz" | tail -1 | sed  's/.*href="\(.*\)-bin.tar.gz".*/\1/g')
   - 'echo "Apache Ant ARCHIVE: $APACHE_ANT_BASE"'
   - '[ "${TRAVIS_OS_NAME}" = "linux" ] && wget http://apache.mirror.iphh.net/ant/binaries/$APACHE_ANT_BASE-bin.tar.gz && tar xzf $APACHE_ANT_BASE-bin.tar.gz && sudo mv $APACHE_ANT_BASE /usr/local/$APACHE_ANT_BASE && sudo rm -f /usr/local/ant && sudo ln -s /usr/local/$APACHE_ANT_BASE /usr/local/ant && sudo ln -s /usr/local/$APACHE_ANT_BASE/bin/ant /usr/local/bin/ant || true'
@@ -23,12 +27,15 @@ os:
   - linux
   - osx
 
-env: JDK=11
+env: JDK=default
 
 matrix:
     include:
-        - env: JDK=default
+        - env: JDK=11
+          os: linux
+        - env: JDK=11
           os: linux
+          arch: arm64
         - env: JDK=12
           os: linux
         - env: JDK=ea