DATACMNS-535 - Build now requires Java 7 to run.

Added Maven Enforcer Plugin to make sure the build is run against a JDK 7.

Related ticket: DATACMNS-532.

pom.xml

@@ -204,6 +204,28 @@
 					</execution>
 				</executions>
 			</plugin>
+
+			<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
+				<artifactId>maven-enforcer-plugin</artifactId>
+				<version>1.3.1</version>
+				<executions>
+					<execution>
+						<id>enforce-rules</id>
+						<goals>
+							<goal>enforce</goal>
+						</goals>
+					</execution>
+				</executions>
+				<configuration>
+					<rules>
+						<requireJavaVersion>
+							<version>[1.7,1.9)</version>
+						</requireJavaVersion>
+					</rules>
+				</configuration>
+			</plugin>
+
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-assembly-plugin</artifactId>
@@ -212,6 +234,7 @@
 				<groupId>org.codehaus.mojo</groupId>
 				<artifactId>wagon-maven-plugin</artifactId>
 			</plugin>
+
 		</plugins>
 	</build>
 

readme.md

@@ -1,9 +1,8 @@
-# Spring Data Commons #
+# Spring Data Commons
 
-[Spring Data Commons](http://projects.spring.io/spring-data/) is part of the umbrella Spring Data project that provides shared infrastructure across the Spring Data projects.
-Most importantly at the moment it contains technology neutral repository interfaces as well as a metadata model for persisting Java classes.
+[Spring Data Commons](http://projects.spring.io/spring-data/) is part of the umbrella Spring Data project that provides shared infrastructure across the Spring Data projects. It contains technology neutral repository interfaces as well as a metadata model for persisting Java classes.
 
-## Features ##
+## Features
 
 * Powerful Repository and custom object-mapping abstractions
 * Support for cross-store persistence
@@ -13,7 +12,20 @@ Most importantly at the moment it contains technology neutral repository interfa
 * Possibility to integrate custom repository code
 * Easy Spring integration with custom namespace
 
-## Getting Help ##
+## Building the project
+
+### Prerequisites
+
+- Maven 3
+- Java 7 (the project produces Java 6 compatible bytecode but partially integrates with Java 7)
+
+```
+$ git clone https://github.com/spring-projects/spring-data-commons.git
+$ cd spring-data-commons
+$ mvn clean install
+```
+
+## Getting Help
 
 This README as well as the [reference documentation](http://docs.spring.io/spring-data/data-commons/docs/current/reference/html/) are the best places to start learning about Spring Data Commons.
 
@@ -21,12 +33,10 @@ The main project [website](http://www.springsource.org/spring-data) contains lin
 
 For more detailed questions, use the [forum](http://forum.spring.io/forum/spring-projects/data). If you are new to Spring as well as to Spring Data, look for information about [Spring projects](https://spring.io/projects). 
 
-
-## Contributing to Spring Data Commons##
+## Contributing to Spring Data Commons
 
 Here are some ways for you to get involved in the community:
 
-* Get involved with the Spring community on the Spring Community Forums.  Please help out on the [forum](http://forum.spring.io/forum/spring-projects/data) by responding to questions and joining the debate.
 * Create [JIRA](https://jira.springsource.org/browse/DATACMNS) tickets for bugs and new features and comment and vote on the ones that you are interested in.  
 * Github is for social coding: if you want to write code, we encourage contributions through pull requests from [forks of this repository](http://help.github.com/forking/). If you want to contribute code this way, please reference a JIRA ticket as well covering the specific issue you are addressing.
 * Watch for upcoming articles on Spring by [subscribing](https://spring.io/blog.atom) to springframework.org