Polish command line property source demo

Issue: SPR-8482

SPR-8482/README.markdown

@@ -18,14 +18,14 @@ this from within Eclipse using the Run->Run Configurations menu, or from the Mav
 command line with the following:
 
 ```bash
-$ mvn -e exec:java -Dexec.mainClass="org.springframework.issues.Spr8482Main" -Dexec.args="--greeting=Wilkommen"
+$ mvn package exec:java -Dexec.mainClass="org.springframework.issues.Spr8482Main" -Dexec.args="--greeting=Wilkommen"
 ```
 
 Now, try leaving the --greeting command line argument in place while also setting a
 'greeting' environment variable when running the application:
 
 ```bash
-$ greeting=Bienvenidos  mvn -e exec:java -Dexec.mainClass="org.springframework.issues.Spr8482Main" -Dexec.args="--greeting=Wilkommen"
+$ greeting=Bienvenidos  mvn package exec:java -Dexec.mainClass="org.springframework.issues.Spr8482Main" -Dexec.args="--greeting=Wilkommen"
 ```
 
 You'll notice that 'Bienvenidos' is now the greeting.  This is because the system

SPR-8482/pom.xml

@@ -49,13 +49,15 @@
 		<plugins>
 			<plugin>
 				<artifactId>maven-compiler-plugin</artifactId>
+				<version>2.3.2</version>
 				<configuration>
 					<source>1.6</source>
 					<target>1.6</target>
 				</configuration>
 			</plugin>
 			<plugin>
 				<artifactId>maven-surefire-plugin</artifactId>
+				<version>2.7.2</version>
 				<configuration>
 					<includes>
 						<include>**/*Tests.java</include>