Add a file which will: check that the development environment is setup, since its the only initial place to use jdk8 features; give hints on where to get a lambda build, ide, etc.

Author: Graham Allan

src/main/java/org/adoptajsr/lambda/tutorial/setupcheck/ConfigureYourLambdaBuildOfJdk.java

@@ -0,0 +1,25 @@
+package org.adoptajsr.lambda.tutorial.setupcheck;
+
+import java.util.List;
+import static java.util.Arrays.asList;
+
+public class ConfigureYourLambdaBuildOfJdk {
+
+    public static void main(String... args) {
+        List<String> messages =  asList(
+            "If this source file does not compile, you have not configured your development setup correctly.",
+            "It uses both a new JDK 8 syntax (method references with '::') and a new JDK 8 library method (Iterable#forEach)",
+            "You should also be able to execute this main method, and see this message printed to the console.",
+            "",
+            "To configure your development environment, you need:",
+            "    - a lambda build of JDK 8, available at: http://jdk8.java.net/lambda/",
+            "    - a lambda-aware IDE.",
+            "          IntelliJ and NetBeans support lambdas in early access versions, available at: http://openjdk.java.net/projects/lambda/ \n" +
+            "          Eclipse support is more sketchy, the method described here just about works: http://tuhrig.de/?p=921",
+            "          Maven will compile your code and run your tests, just, add JDK 8 javac and java executables to your system path and use 'mvn test'",
+            "",
+            "Until this source file compiles, you will be unable to make progress in the tutorial.");
+
+        messages.forEach(System.out::println);
+    }
+}