Travis does not support Oracle JDK 7 anymore.

thboileau · thboileau · commit 1b551a09e1c3 · 2017-10-05T15:28:57.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -1,6 +1,6 @@
 language: java
 jdk:
-  - oraclejdk7
+  - openjdk7
 script:
  - "cd build"
  - "ant rebuild -lib ./tools/junit/"
