Added SQL command "EXISTS" and "NOT EXISTS" to Ebean (ExpressionFactory,

ExpressionList).

src/main/java/com/avaje/ebeaninternal/util/DefaultExpressionList.java

@@ -468,6 +468,19 @@ public class DefaultExpressionList<T> implements SpiExpressionList<T> {
     add(expr.in(propertyName, values));
     return this;
   }
+  
+  @Override
+  public ExpressionList<T> exists(Query<?> subQuery) {
+	add(expr.exists(subQuery));
+	return this;
+  }
+  
+  @Override
+  public ExpressionList<T> notExists(Query<?> subQuery) {
+	add(expr.notExists(subQuery));
+	return this;
+  }
+
 
   @Override
   public ExpressionList<T> isNotNull(String propertyName) {