title: Simple tutorial example (lambda expression) doesn't run
body: <p>Finally decided to start a bit of experimentation on the new features of jdk8, namely the <a href="http://docs.oracle.com/javase/tutorial/java/javaOO/lambdaexpressions.html" rel="nofollow">lambda expressions following the tutorial</a>. For convenience, I stripped-down the example, see SSCCE below. </p>
  
  <p>Typing out the predicate just runs fine, refactoring it to a lambda expression as suggested (and actually done) by Netbeans compiles (?) without errors, but doesn't run. The laconic console printout is </p>
  
  <blockquote>
    <p>Fehler: Hauptklasse simple.Simple konnte nicht gefunden oder geladen
    werden</p>
  </blockquote>
  
  <p>("Error: main class couldn't be found or loaded")</p>
  
  <p>Environment:</p>
  
  <ul>
  <li>jdk: jdk-8-ea-bin-b102-windows-i586-08_aug_2013.exe</li>
  <li>Netbeans 7.4 beta, bundle from 14.7.2013. Not sure if that's the latest, couldn't download from the Netbeans site (got a "content encoding error" when clicking on its download link)</li>
  </ul>
  
  <p>BTW, thought of using Netbeans only because it already has support for jdk8 (if not netbeans, who else ;-) - the eclipse beta preview from efxclipse has a similar issue (compiling but not running the example). So being definitely out off my comfort zone, possibly some very stupid mistake on my part... ?  </p>
  
  <pre><code>package simple; 
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.function.Predicate;
  
  public class Simple {
  
      /**
       * @param args the command line arguments
       */
      public static void main(String[] args) {
          List&lt;Member&gt; members = createMembers();
          // implement predicate directly, runs fine
  //        Predicate&lt;Member&gt; predicate = new Predicate&lt;Member&gt;() {
  //            public boolean test(Member member) {
  //                return member.getAge() &gt;= 18;
  //            }
  //        }; 
          // predicate converted to lambda, fails to run
          // "class couldn't be found"
          Predicate&lt;Member&gt; predicate = (Member member) -&gt; member.getAge() &gt;= 18; 
          for (Member member : members) {
              if (predicate.test(member)) {
                  member.printMember();;
              }
          }
      }
  
      public static class Member {
          private String name;
          private int age;
          public Member(String name, int age) {
              this.name = name;
              this.age = age;
          }
  
          public int getAge() {
              return age;
          }
  
          public void printMember() {
              System.out.println(name + ", " + getAge());
          }
      }
  
      private static List&lt;Member&gt; createMembers() {
          List&lt;Member&gt; members = new ArrayList&lt;&gt;();
          members.add(new Member("Mathilda", 45));
          members.add(new Member("Clara", 15));
          members.add(new Member("Gloria", 18));
          return members;
      }
  
  }
  </code></pre>