samples/mail-archive: use latest parent

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1687512 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/mail-archive/james-wrapper/pom.xml b/mail-archive/james-wrapper/pom.xml
index 0285236..1f56fe0 100644
--- a/mail-archive/james-wrapper/pom.xml
+++ b/mail-archive/james-wrapper/pom.xml
@@ -22,7 +22,8 @@
     <parent>
         <groupId>org.apache.sling</groupId>
         <artifactId>sling</artifactId>
-        <version>18</version>
+        <version>23</version>
+        <relativePath />
     </parent>
 
     <groupId>org.apache.sling</groupId>
@@ -32,10 +33,6 @@
     <name>Apache Sling Mail Archive Server - Apache James Wrapper</name>
     <description>Wraps the Apache James libraries  until newer James bundles are released</description>
 
-    <properties>
-        <sling.java.version>6</sling.java.version>
-    </properties>
-
     <build>
         <plugins>
             <plugin>
diff --git a/mail-archive/server/pom.xml b/mail-archive/server/pom.xml
index 8c0d014..98c600f 100644
--- a/mail-archive/server/pom.xml
+++ b/mail-archive/server/pom.xml
@@ -22,7 +22,8 @@
     <parent>
         <groupId>org.apache.sling</groupId>
         <artifactId>sling</artifactId>
-        <version>18</version>
+        <version>23</version>
+        <relativePath />
     </parent>
 
     <groupId>org.apache.sling</groupId>
@@ -32,11 +33,6 @@
     <name>Apache Sling Mail Archive Server</name>
     <description>Server is designed to archive messages of mailing lists and allows convenient search and navigation through them.</description>
 
-    <properties>
-        <sling.java.version>6</sling.java.version>
-    </properties>
-
-
     <build>
         <plugins>
             <plugin>
@@ -65,7 +61,6 @@
             <plugin>
                 <groupId>org.jacoco</groupId>
                 <artifactId>jacoco-maven-plugin</artifactId>
-                <version>0.6.2.201302030002</version>
                 <executions>
                     <execution>
                         <id>prepare-agent</id>
diff --git a/mail-archive/stats/pom.xml b/mail-archive/stats/pom.xml
index b9e74c3..3523b5f 100644
--- a/mail-archive/stats/pom.xml
+++ b/mail-archive/stats/pom.xml
@@ -24,7 +24,8 @@
     <parent>
         <groupId>org.apache.sling</groupId>
         <artifactId>sling</artifactId>
-        <version>18</version>
+        <version>23</version>
+        <relativePath />
     </parent>
 
     <groupId>org.apache.sling</groupId>
@@ -39,10 +40,6 @@
         Stats module for the mail archive server
     </description>
 
-    <properties>
-        <sling.java.version>6</sling.java.version>
-    </properties>
-
     <build>
         <plugins>
             <plugin>
diff --git a/mail-archive/ui/pom.xml b/mail-archive/ui/pom.xml
index e3d10ac..971239d 100644
--- a/mail-archive/ui/pom.xml
+++ b/mail-archive/ui/pom.xml
@@ -22,7 +22,8 @@
     <parent>
         <groupId>org.apache.sling</groupId>
         <artifactId>sling</artifactId>
-        <version>18</version>
+        <version>23</version>
+        <relativePath />
     </parent>
 
     <groupId>org.apache.sling</groupId>
@@ -32,10 +33,6 @@
     <name>Apache Sling Mail Archive Server UI</name>
     <description>User interface for Mail Archive Server.</description>
 
-    <properties>
-        <sling.java.version>6</sling.java.version>
-    </properties>
-
     <build>
         <plugins>
             <plugin>