NullPointerException caused by null fields

jeanluc

I'm trying to process a CSV file which has several columns with timestamps (date+time). Some of the rows have nulls for those, fields, unfortunately.

This causes an NPE as seen below.

Exception: java.lang.NullPointerException
Message: null
Stack trace:

  com.rapidminer.operator.io.AbstractDataReader.generateDataRow(AbstractDataReader.java:481)
  com.rapidminer.operator.io.AbstractDataReader.createExampleSet(AbstractDataReader.java:513)
  com.rapidminer.operator.io.AbstractDataReader.createExampleSet(AbstractDataReader.java:495)
  com.rapidminer.operator.io.AbstractExampleSource.read(AbstractExampleSource.java:52)
  com.rapidminer.operator.io.AbstractExampleSource.read(AbstractExampleSource.java:36)
  com.rapidminer.operator.io.AbstractReader.doWork(AbstractReader.java:121)
  com.rapidminer.operator.Operator.execute(Operator.java:767)
  com.rapidminer.operator.execution.SimpleUnitExecutor.execute(SimpleUnitExecutor.java:51)
  com.rapidminer.operator.ExecutionUnit.execute(ExecutionUnit.java:709)
  com.rapidminer.operator.OperatorChain.doWork(OperatorChain.java:363)
  com.rapidminer.operator.ProcessRootOperator.doWork(ProcessRootOperator.java:345)
  com.rapidminer.operator.Operator.execute(Operator.java:767)
  com.rapidminer.Process.run(Process.java:745)
  com.rapidminer.Process.run(Process.java:689)
  com.rapidminer.Process.run(Process.java:665)
  com.rapidminer.Process.run(Process.java:655)
  com.rapidminer.gui.ProcessThread.run(ProcessThread.java:65)

Line 481 is

values = set.getDate(i).getTime();

Build is 5.0.001

jeanluc

A correction: I  found that the error was caused not by a null field (there was none in the particular field that I processed), but by an incorrect date format. Once I changed to match the file the processing went pass this stage. I'm still looking why it failed later with a different error, but that can be because I'm new to the tool.