DATAJPA-14 - Added query validation for String based JPA query.

Simply let the EntityManager create a JPA query object on SimpleJpaQuery creation. This fails if the query contains syntactical errors.

src/main/java/org/springframework/data/jpa/repository/query/SimpleJpaQuery.java

@@ -59,6 +59,9 @@ final class SimpleJpaQuery extends AbstractStringBasedJpaQuery {
                 method.getCountQuery() == null ? QueryUtils
                         .createCountQueryFor(queryString) : method
                         .getCountQuery();
+
+        // Try to create a
+        em.createQuery(queryString);
     }