try another way to install openjdk in travis

Author: holgerbrandl

.travis.yml

@@ -18,11 +18,15 @@ install:
 
 ## see https://askubuntu.com/questions/190582/installing-java-automatically-with-silent-option
   - sudo apt-get update
-#  - sudo apt-get install -y python-software-properties
+  - sudo apt-get install -y python-software-properties
 #  - sudo add-apt-repository -y ppa:webupd8team/java
 #  - echo "oracle-java8-installer shared/accepted-oracle-license-v1-1 select true" | sudo debconf-set-selections
 #  - sudo apt-get install -y oracle-java8-installer
 
+  - sudo add-apt-repository ppa:openjdk-r/ppa
+  - sudo apt-get update
+  - sudo apt-get install openjdk-8-jdk
+
 #  - sudo apt-get install -y openjdk-8-jdk
   - sudo apt-get install -y curl unzip zip wget
 
@@ -33,7 +37,7 @@ install:
   ## install kotlin and maven
 #  - bash -c 'source "/home/travis/.sdkman/bin/sdkman-init.sh"; yes | sdk install java 8u144-oracle'
 #  - bash -c 'source "/home/travis/.sdkman/bin/sdkman-init.sh"; yes | sdk install java 8u144-zulu'
-  - sudo apt-get install -y openjdk-8-jdk
+#  - sudo apt-get install -y openjdk-8-jdk
   - sdk install maven
   - sdk install kotlin
   - sdk install gradle