dependcy versions are centralized

annotation/pom.xml

@@ -192,17 +192,17 @@
 		<dependency>
 			<groupId>org.apache.poi</groupId>
 			<artifactId>poi</artifactId>
-			<version>3.12</version>
+			<version>${apache.poi.version}</version>
 		</dependency>
 		<dependency>
 			<groupId>org.apache.poi</groupId>
 			<artifactId>poi-ooxml-schemas</artifactId>
-			<version>3.12</version>
+			<version>${apache.poi.version}</version>
 		</dependency>
 		<dependency>
 			<groupId>org.apache.poi</groupId>
 			<artifactId>poi-ooxml</artifactId>
-			<version>3.12</version>
+			<version>${apache.poi.version}</version>
 		</dependency>
 
 <!-- mockito used for testing -->

pom.xml

@@ -43,6 +43,7 @@
 		
 		<apache.commons-lang3.version>3.1</apache.commons-lang3.version>
 		<apache.httpcomponents.version>4.4</apache.httpcomponents.version>
+		<apache.poi.version>3.12</apache.poi.version>
 		
 		<commons-io.version>2.4</commons-io.version>
 		<commons-cli.version>1.2</commons-cli.version>

service/pom.xml

@@ -113,17 +113,17 @@
 		<dependency>
 			<groupId>org.apache.poi</groupId>
 			<artifactId>poi</artifactId>
-			<version>3.10-FINAL</version>
+			<version>${apache.poi.version}</version>
 		</dependency>
 		<dependency>
 			<groupId>org.apache.poi</groupId>
 			<artifactId>poi</artifactId>
-			<version>3.12</version>
+			<version>${apache.poi.version}</version>
 		</dependency>
 		<dependency>
 			<groupId>org.apache.poi</groupId>
 			<artifactId>poi-ooxml</artifactId>
-			<version>3.12</version>
+			<version>${apache.poi.version}</version>
 		</dependency>
 
 		<!-- https://mvnrepository.com/artifact/com.unboundid/unboundid-ldapsdk -->