chore: fix JDK Travis failures

.travis.yml

@@ -1,20 +1,23 @@
 language: java
 before_install:
-  - echo $GPG_SECRET_KEYS | base64 --decode | $GPG_EXECUTABLE --import || true
+  - echo $GPG_SECRET_KEYS | base64 --decode | $GPG_EXECUTABLE --import --batch || true
 matrix:
   include:
-    - name: 'OpenJDK 7'
-      jdk: openjdk7
-    - name: 'OpenJDK 8'
-      jdk: openjdk8
-    - name: 'Oracle JDK 8'
-      jdk: oraclejdk8
+    - jdk: openjdk7
+      dist: trusty
+    - jdk: openjdk8
+      dist: xenial
     - jdk: openjdk11
-      name: 'OpenJDK 11'
+      dist: xenial
+    - jdk: oraclejdk7
+      dist: precise
+    - jdk: oraclejdk8
+      dist: trusty
+    - jdk: oraclejdk11
+      dist: trusty
   allow_failures:
-    - name: 'Oracle JDK 8'
-    - name: 'OpenJDK 7'
-    - name: 'OpenJDK 11'
+    - jdk: openjdk7
+    - jdk: oraclejdk7
 install:
   - mvn --settings .maven.xml install -DskipTests=true -Dgpg.skip -Dmaven.javadoc.skip=true -B -V
 after_success:

pom.xml

@@ -156,7 +156,7 @@
       <plugin>
         <groupId>org.jacoco</groupId>
         <artifactId>jacoco-maven-plugin</artifactId>
-        <version>0.7.7.201606060606</version>
+        <version>0.8.5</version>
         <executions>
           <execution>
             <goals>
@@ -240,4 +240,4 @@
       </plugin>
     </plugins>
   </build>
-</project>
+</project>