Update java version to 1.8

Author: fmbenhassine

spring-batch-elasticsearch/pom.xml

@@ -8,7 +8,7 @@
 
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-		<java.version>1.7</java.version>
+		<java.version>1.8</java.version>
 		<spring-batch.version>3.0.1.RELEASE</spring-batch.version>
 		<spring-data-elasticsearch.version>1.0.1.RELEASE</spring-data-elasticsearch.version>
 		<mockito.verion>1.9.5</mockito.verion>

spring-batch-excel/pom.xml

@@ -29,6 +29,7 @@
         <spring.batch.version>3.0.3.RELEASE</spring.batch.version>
         <jxl.version>2.6.12</jxl.version>
         <poi.version>3.11</poi.version>
+        <java.version>1.8</java.version>
     </properties>
 
     <dependencies>
@@ -89,8 +90,8 @@
                 <artifactId>maven-compiler-plugin</artifactId>
                 <version>3.2</version>
                 <configuration>
-                    <source>1.6</source>
-                    <target>1.6</target>
+                    <source>${java.version}</source>
+                    <target>${java.version}</target>
                 </configuration>
             </plugin>
             <plugin>