fix build warnings

Change-Id: I713a5f117dc660550684338f162582089a5d3403
Reviewed-on: http://fulliautomatix.ics.uci.edu:8443/118
Reviewed-by: Inci Cetindil <icetindil@gmail.com>
Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
diff --git a/asterix-maven-plugins/lexer-generator-maven-plugin/pom.xml b/asterix-maven-plugins/lexer-generator-maven-plugin/pom.xml
index 947cf93..58ce450 100644
--- a/asterix-maven-plugins/lexer-generator-maven-plugin/pom.xml
+++ b/asterix-maven-plugins/lexer-generator-maven-plugin/pom.xml
@@ -30,7 +30,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-compiler-plugin</artifactId>
-        <version>2.0.2</version>
+        <version>2.3.2</version>
         <configuration>
           <source>1.7</source>
           <target>1.7</target>