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我正在替換WordCountDemo中的控制檯操作員,但它在STRAM Events中給我一個operatorError。當我點擊它時,它會顯示我出現空指針錯誤。 datatorrent我很新。DataTorrent:JDBC操作員不工作
下面是完整的錯誤消息:
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)