Missing Nullability annotation on JdbcTemplate.batchUpdate

[alshain]

From Kotlin, calling JdbcTemplate.batchUpdate with an array containing nulls is impossible because of a missing nullability annotation:

jdbcTemplate.batchUpdate(
  """
  INSERT INTO "my_table" ("non_null", "can_be_null") VALUES (?, ?)
  """,
  listOf(
    arrayOf<Any?>(
      "non-null",
      null,
    )
  )
)

Error:

None of the following candidates is applicable:
<SNIP>
                                                             vvvvvvvvv
fun batchUpdate(sql: String, batchArgs: (Mutable)List<Array<(out) Any>>): IntArray:
Argument type mismatch: actual type is 'List<Array<Any?>>', but '(Mutable)List<Array<(out) Any>>' was expected.

Proposed solution

Change to List<@Nullable Object[]> here:

spring-framework/spring-jdbc/src/main/java/org/springframework/jdbc/core/JdbcTemplate.java

Lines 1048 to 1055 in 1700fad

	@Override
	public int[] batchUpdate(String sql, List<Object[]> batchArgs) throws DataAccessException {
	return batchUpdate(sql, batchArgs, new int[0]);
	}
	@Override
	public int[] batchUpdate(String sql, List<Object[]> batchArgs, int[] argTypes) throws DataAccessException {
	if (batchArgs.isEmpty()) {

[sdeleuze]

Closing this issue in favor of the related PR #37012.

@alshain Next time, no need to create an issue before the related PR, see https://github.com/spring-projects/spring-framework/blob/main/CONTRIBUTING.md#submit-a-pull-request.