[Java] Be specific with JDK in Travis matrix.

Author: mjpt777

.travis.yml

@@ -1,5 +1,3 @@
-jdk: oraclejdk8
-
 sudo: false
 
 matrix:
@@ -33,6 +31,7 @@ matrix:
       language: cpp
       compiler: gcc
       os: linux
+      jdk: oraclejdk8
       addons:
         apt:
           packages:
@@ -46,6 +45,7 @@ matrix:
       language: cpp
       compiler: gcc
       os: linux
+      jdk: oraclejdk8
       addons:
         apt:
           packages:
@@ -59,6 +59,7 @@ matrix:
       language: cpp
       compiler: gcc
       os: linux
+      jdk: oraclejdk8
       addons:
         apt:
           packages:
@@ -72,6 +73,7 @@ matrix:
       language: cpp
       compiler: clang
       os: linux
+      jdk: oraclejdk8
       addons:
         apt:
           packages:
@@ -87,6 +89,7 @@ matrix:
       language: cpp
       compiler: clang
       os: linux
+      jdk: oraclejdk8
       addons:
         apt:
           packages:
@@ -102,6 +105,7 @@ matrix:
       language: cpp
       compiler: clang
       os: linux
+      jdk: oraclejdk8
       addons:
         apt:
           packages:
@@ -117,6 +121,7 @@ matrix:
       language: c++
       compiler: clang
       os: osx
+      jdk: oraclejdk8
       script: ./cppbuild/cppbuild
 
 before_cache: