Using UTF-8 source encoding.

guacamole-common/pom.xml

@@ -9,6 +9,10 @@
     <name>guacamole-common</name>
     <url>http://guacamole.sourceforge.net/</url>
 
+    <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+
     <build>
         <plugins>
             <plugin>