Update .travis.yml

.travis.yml

@@ -50,7 +50,9 @@ install:
     echo yes | $ANDROID update sdk -a -t tools,platform-tools,build-tools-23.0.1,android-23 --no-ui --force --no-https;
   fi
 - sudo apt-get install openjdk-8-jdk
-- java -version
+- echo "JAVA_HOME=" $JAVA_HOME
+- echo "PATH=" $PATH
+- ll /usr/java
 - sudo pip install --upgrade pip
 - sudo pip install setuptools-rust
 - sudo pip install pyOpenSSL