尝试使用JDBI的流畅API检索java.sql.Timestamp时发生NullPointerException

Question

我正在尝试使用以下方法从Vertica表中检索MAX(ymdh)。

    String query = "SELECT MAX(ymdh) AS ymdh_max FROM table_name";
    VerticaDBUtil tjVerticaUtil = VerticaDBUtil.getVerticaRODBUtil();
    Jdbi jdbi = tjVerticaUtil.getDbi();
    Handle handle = jdbi.open();
    List<java.sql.Timestamp> maxYmdhStr = handle.createQuery(query).mapTo(java.sql.Timestamp.class).list();

当我使用JDBI运行原​​始SQL时，查询返回有效的时间戳，但我在.list()上收到了NullPointerException。

Exception in thread "main" java.lang.NullPointerException
    at com.github.arteam.jdbi3.InstrumentedTimingCollector.collect(InstrumentedTimingCollector.java:34)
    at org.jdbi.v3.core.statement.SqlStatements$1.logAfterExecution(SqlStatements.java:153)
    at org.jdbi.v3.core.statement.SqlLoggerUtil.wrap(SqlLoggerUtil.java:32)
    at org.jdbi.v3.core.statement.SqlStatement.internalExecute(SqlStatement.java:1380)
    at org.jdbi.v3.core.result.ResultProducers.lambda$getResultSet$2(ResultProducers.java:68)
    at org.jdbi.v3.core.result.ResultIterable.lambda$of$0(ResultIterable.java:53)
    at org.jdbi.v3.core.result.ResultIterable.stream(ResultIterable.java:141)
    at org.jdbi.v3.core.result.ResultIterable.collect(ResultIterable.java:197)
    at org.jdbi.v3.core.result.ResultIterable.list(ResultIterable.java:186)

在使用JDBI检索时间戳时，有人遇到过类似的问题吗？我尝试如下注册java.sql.Timestamp的行映射器。

jdbi.registerRowMapper(java.sql.Timestamp.class, (rs, ctx) -> rs.getTimestamp("ymdh_max"));

但是我仍然收到NullPointerException。