Polishing.

Original pull request #1226
See #1212

spring-data-jdbc/src/main/java/org/springframework/data/jdbc/repository/query/StringBasedJdbcQuery.java

@@ -165,7 +165,7 @@ public class StringBasedJdbcQuery extends AbstractJdbcQuery {
 		RelationalParameters.RelationalParameter parameter = queryMethod.getParameters().getParameter(p.getIndex());
 		ResolvableType resolvableType = parameter.getResolvableType();
 		Class<?> type = resolvableType.resolve();
-		Assert.notNull(type, "@Query parameter could not be resolved!");
+		Assert.notNull(type, "@Query parameter type could not be resolved!");
 
 		JdbcValue jdbcValue;
 		if (value instanceof Iterable) {
@@ -174,7 +174,9 @@ public class StringBasedJdbcQuery extends AbstractJdbcQuery {
 			SQLType jdbcType = null;
 
 			Class<?> elementType = resolvableType.getGeneric(0).resolve();
+
 			Assert.notNull(elementType, "@Query Iterable parameter generic type could not be resolved!");
+
 			for (Object o : (Iterable<?>) value) {
 				JdbcValue elementJdbcValue = converter.writeJdbcValue(o, elementType,
 						JdbcUtil.targetSqlTypeFor(JdbcColumnTypes.INSTANCE.resolvePrimitiveType(elementType)));

spring-data-jdbc/src/test/java/org/springframework/data/jdbc/repository/JdbcRepositoryCustomConversionIntegrationTests.java

@@ -179,6 +179,7 @@ public class JdbcRepositoryCustomConversionIntegrationTests {
 	}
 
 	interface EntityWithStringyBigDecimalRepository extends CrudRepository<EntityWithStringyBigDecimal, CustomId> {
+
 		@Query("SELECT * FROM ENTITY_WITH_STRINGY_BIG_DECIMAL WHERE DIRECTION IN (:types)")
 		List<EntityWithStringyBigDecimal> findByEnumTypeIn(List<Direction> types);
 

spring-data-jdbc/src/test/resources/org.springframework.data.jdbc.repository/JdbcRepositoryCustomConversionIntegrationTests-oracle.sql

@@ -4,7 +4,7 @@ DROP TABLE OTHER_ENTITY CASCADE CONSTRAINTS PURGE;
 CREATE TABLE ENTITY_WITH_STRINGY_BIG_DECIMAL (
     ID NUMBER GENERATED BY DEFAULT ON NULL AS IDENTITY PRIMARY KEY,
     STRINGY_NUMBER DECIMAL(20,10),
-    DIRECTION INTEGER
+    DIRECTION NUMBER(1,0)
 );
 
 CREATE TABLE OTHER_ENTITY (