Development is done on Java 11 (OpenJDK)

.travis.yml

@@ -1,9 +1,5 @@
 language: java
 jdk:
-    - openjdk7
-# JDK7 is not supported anymore; https://github.com/travis-ci/travis-ci/issues/7884#issuecomment-308451879
-#    - oraclejdk7
-    - oraclejdk8
     - openjdk11
 after_success:
   - mvn clean cobertura:cobertura coveralls:report

pom.xml

@@ -43,7 +43,9 @@
 
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <java.version>1.7</java.version>
+        <maven.compiler.target>1.8</maven.compiler.target>
+        <maven.compiler.source>1.8</maven.compiler.source>
+
         <slf4j.version>1.7.25</slf4j.version>
         <asm.version>7.1</asm.version>
 
@@ -66,8 +68,6 @@
                     <version>3.8.0</version>
                     <configuration>
                         <showWarnings>true</showWarnings>
-                        <source>${java.version}</source>
-                        <target>${java.version}</target>
                     </configuration>
                 </plugin>