DATAJPA-564 - Add support for dynamically evaluating SpEL expressions in derived queries.

We now support the dynamic discovery and binding of SpEL Expression parameters in query derivation. Introduced ExpressionAwareParameterBinder for generic SpEL expression evaluation support.

src/test/java/org/springframework/data/jpa/repository/UserRepositoryTests.java

@@ -59,6 +59,8 @@ import org.springframework.data.jpa.domain.sample.Role;
 import org.springframework.data.jpa.domain.sample.SpecialUser;
 import org.springframework.data.jpa.domain.sample.User;
 import org.springframework.data.jpa.repository.sample.UserRepository;
+import org.springframework.expression.Expression;
+import org.springframework.expression.spel.standard.SpelExpressionParser;
 import org.springframework.test.context.ContextConfiguration;
 import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
 import org.springframework.transaction.annotation.Transactional;
@@ -287,7 +289,7 @@ public class UserRepositoryTests {
 
 		flushTestUsers();
 
-		repository.findByLastname(null);
+		repository.findByLastname((String) null);
 	}
 
 	@Test
@@ -1615,6 +1617,21 @@ public class UserRepositoryTests {
 		assertThat(users.get(0), is(firstUser));
 	}
 
+	/**
+	 * @see DATAJPA-XXX
+	 */
+	@Test
+	public void shouldFindUserByLastnameWithSpelExpressionInDerivedQuery() {
+
+		flushTestUsers();
+
+		Expression expr = new SpelExpressionParser().parseExpression("'Gier' + 'ke'");
+		List<User> users = repository.queryByLastname(expr);
+
+		assertThat(users, hasSize(1));
+		assertThat(users.get(0), is(firstUser));
+	}
+
 	private Page<User> executeSpecWithSort(Sort sort) {
 
 		flushTestUsers();

src/test/java/org/springframework/data/jpa/repository/sample/UserRepository.java

@@ -37,6 +37,7 @@ import org.springframework.data.jpa.repository.QueryHints;
 import org.springframework.data.jpa.repository.query.Procedure;
 import org.springframework.data.repository.CrudRepository;
 import org.springframework.data.repository.query.Param;
+import org.springframework.expression.Expression;
 import org.springframework.transaction.annotation.Transactional;
 
 import com.google.common.base.Optional;
@@ -471,4 +472,9 @@ public interface UserRepository extends JpaRepository<User, Integer>, JpaSpecifi
 	 */
 	@Query("select u from User u where u.lastname like %:#{[0]}% and u.lastname like %:lastname%")
 	List<User> findByLastnameWithSpelExpression(@Param("lastname") String lastname);
+
+	/**
+	 * @see DATAJPA-XXX
+	 */
+	List<User> queryByLastname(Expression lastname);
 }