Question

我们有Talend数据集成工具，它在将信息从源系统发送到目标系统时使用eclipse代码。得到错误

Exception in component tMap_1

    java.lang.NullPointerException
        at bigdata.copy_of_readsysproandsendmail_0_1.Copy_of_ReadSysproAndSendMail.tJDBCInput_2Process(Copy_of_ReadSysproAndSendMail.java:1937)
        at bigdata.copy_of_readsysproandsendmail_0_1.Copy_of_ReadSysproAndSendMail.runJobInTOS(Copy_of_ReadSysproAndSendMail.java:5086)
        at bigdata.copy_of_readsysproandsendmail_0_1.Copy_of_ReadSysproAndSendMail.main(Copy_of_ReadSysproAndSendMail.java:4885)

        at bigdata.copy_of_readsysproandsendmail_0_1.Copy_of_ReadSysproAndSendMail.tJDBCInput_2Process(Copy_of_ReadSysproAndSendMail.java:2098)
    at bigdata.copy_of_readsysproandsendmail_0_1.Copy_of_ReadSysproAndSendMail.runJobInTOS(Copy_of_ReadSysproAndSendMail.java:5355)
    at bigdata.copy_of_readsysproandsendmail_0_1.Copy_of_ReadSysproAndSendMail.main(Copy_of_ReadSysproAndSendMail.java:5154)
Job Copy_of_ReadSysproAndSendMail ended at 23:16 03/10/2016. [exit code=0]

输入：

日期数据类型是tmap组件中空值的来源

DNDB date type(source) ---->row1.DNDB(output) is Date data type. both are nullable.

我们尝试过： 但是对我们没用。

避免null row1.DNDB == null？＆＃34; null＆＃34;：row1.DNDB

Answer 1

row1.DNDB==null?"null":row1.DNDB不起作用：您将输出值分配为“null”（带双引号的字符串）或row1.DNDB，它应该是日期。编译时会有一个强制转换异常。

你可以尝试：

Relational.ISNULL(row1.DNDB)?null:row1.DNDB

如果你想要一个Date返回类型; 或

Relational.ISNULL(row1.DNDB)?"null":TalendDate.formatDate("yyyy-MM-dd HH:mm:ss",row1.DNDB)

如果你想要两个值的String返回类型。

同时检查输出列是否已标记为可为空（复选框）

如何在DATE数据类型中检查空指针异常

1 个答案: