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我正在替换WordCountDemo中的控制台操作员,但它在STRAM Events中给我一个operatorError。当我点击它时,它会显示我出现空指针错误。 datatorrent我很新。DataTorrent:JDBC操作员不工作
下面是完整的错误消息:
Abandoning deployment due to setup failure. java.lang.NullPointerException
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:195)
at com.datatorrent.lib.db.jdbc.JdbcStore.connect(JdbcStore.java:163)
at com.datatorrent.lib.db.jdbc.JdbcTransactionalStore.connect(JdbcTransactionalStore.java:118)
at com.datatorrent.lib.db.AbstractTransactionableStoreOutputOperator.setup(AbstractTransactionableStoreOutputOperator.java:94)
at com.datatorrent.lib.db.jdbc.AbstractJdbcTransactionableOutputOperator.setup(AbstractJdbcTransactionableOutputOperator.java:81)
at com.datatorrent.lib.db.jdbc.AbstractJdbcTransactionableOutputOperator.setup(AbstractJdbcTransactionableOutputOperator.java:58)
at com.datatorrent.stram.engine.Node.setup(Node.java:182)
at com.datatorrent.stram.engine.StreamingContainer.setupNode(StreamingContainer.java:1290)
at com.datatorrent.stram.engine.StreamingContainer.access$100(StreamingContainer.java:129)
at com.datatorrent.stram.engine.StreamingContainer$2.run(StreamingContainer.java:1369)