switch to java 8

since java 7 reached end of life, we migrated to java 8. from now on we require jdk 8 to build and run. in the near future, we will slowly change/update the code base to make use of java 8's features

Author: goekay

README.md

@@ -16,7 +16,7 @@ Supported OCPP protocols
 Requirements & Configuration
 -----
 
-1. You need JDK 7, Maven and MySQL.
+1. You need JDK 8, Maven and MySQL.
 
 2. The charge points must be configured to communicate with following addresses. Depending on the OCPP version of the charge point, SteVe will automatically route messages to the version-specific implementation.
   - SOAP: `http://<your-server-ip>:<port>/steve/services/CentralSystemService`

pom.xml

@@ -3,7 +3,7 @@
     <modelVersion>4.0.0</modelVersion>
     <groupId>de.rwth.idsg</groupId>
     <artifactId>steve</artifactId>
-    <version>1.2.0</version>
+    <version>1.3.0</version>
     <packaging>jar</packaging>
 
     <developers>
@@ -22,7 +22,7 @@
     </licenses>
 
     <properties>
-        <java.version>1.7</java.version>
+        <java.version>1.8</java.version>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <jooq.version>3.6.2</jooq.version>
         <cxf.version>3.1.1</cxf.version>