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QUESTION
I have a spring batch job that reads data from a web service, does some enriching in a processor and then saves to DB. If someone runs the same job twice for same set of param I want to delete the old data in db and then re-write as part of this job.
I have written the delete logic in StepExecutionListener Before Step Method.
How can I make my step transactional so that if there is an error in the job the delete operation is rolledback?
...ANSWER
Answered 2020-May-04 at 09:03How can I make my step transactional so that if there is an error in the job the delete operation is rolledback?
You can write the delete logic as part of the item writer which is called inside the transaction driven by Spring Batch. If the transaction is rolled back for any reason, your delete operation will be rolled back. Note that an item writer is not only used for inserting data, but can be used to update data and delete it as well (MongoItemWriter#setDelete is an example).
QUESTION
I am currently having a problem with reading a XML file using XPath expression. I have used the XmlDocument class. When I try reading a particular node from the XML, I get an empty list. The node which I am trying to read is the ID below ProductionRequest.
Here is the XML file which I tried to read:
...ANSWER
Answered 2020-Apr-06 at 18:34Your xml contains namespace http://www.wbf.org/xml/b2mml-v02
at root level node
And you are using the XPath expression /ProductionSchedule/ProductionRequest/ID
but this XPath expression is not suitable for this xml document and that's why you can't get any desired value.
You need to use the below XPath expression to get the id's of all node.
QUESTION
We are in the transition at work from python 2.7 to python 3.5. It's a company wide change and most of our current scripts were written in 2.7 and no additional libraries. I've taken advantage of the Anaconda distro we are using and have already change most of our scripts over using the 2to3 module or completely rewriting them. I am stuck on one piece of code though, which I did not write and the original author is not here. He also did not supply comments so I can only guess at the whole of the script. 95% of the script works correctly until the end where after it creates 7 csv files with different parsed information it has a custom function to combine the csv files into and xls workbook with each csv as new tab.
...ANSWER
Answered 2020-Jan-11 at 18:39Not sure why it errs. It is worth the effort to rewrite the code and use pandas instead. Pandas can read each csv file into a separate dataframe and save all dataframes as a separate sheet in an xls(x) file. This can be done by using the ExcelWriter of pandas. E.g.
QUESTION
I have these coordinates with a separator :
ANSWER
Answered 2019-Dec-31 at 02:10I am assuming that these I/System.out: are not part of the received String, otherwise you would need to modify the code below in order to skip/ignore them (using String.replace
for example).
After calling this:
QUESTION
Here is the method where I have the problem:
...ANSWER
Answered 2017-Apr-20 at 12:43Given you are getting a "Root element is missing" this looks like an issue with your mapping.
[XmlRoot("Claims")]
will not map onto .
Try updating your XML so the roots element is set to rather than
.
If this fixes it then you can either change your XML or update your attribute in the class so it looks like this.
[XmlRoot("ns0:Claims")]
.
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