downgrading maven-compiler-plugin version

Change-Id: I6f01acffc1f05aab106c7132d91be2c4e6faa399
diff --git a/pom.xml b/pom.xml
index 1b75b52..9b275ab 100644
--- a/pom.xml
+++ b/pom.xml
@@ -304,7 +304,9 @@
                 <plugin>
                     <groupId>org.apache.maven.plugins</groupId>
                     <artifactId>maven-compiler-plugin</artifactId>
-                    <version>3.1</version>
+                    <!-- TODO: update once following issue is fixed. -->
+                    <!-- https://jira.codehaus.org/browse/MCOMPILER-205 -->
+                    <version>2.5.1</version>
                     <configuration>
                         <source>1.7</source>
                         <target>1.7</target>