Prefix mapping table must not be empty

CloverDX Platform
1

Hello,

When I execute my very sample graph using a MultiLevelReader and a XMLWriter with :

(Is it suffisant ?)

in the field “Mapping of port to Xml Structure” of the “Edit Component of XMLWriter”, I have this error :
____________________________________________________________________
ERROR [WatchDog] - Graph execution finished with error
ERROR [WatchDog] - Node MULTI_LEVEL_READER0 finished with status: ERROR caused by: Component pre-execute initialization failed. Prefix mapping table must not be empty
ERROR [WatchDog] - Node MULTI_LEVEL_READER0 error details:
Element [MULTI_LEVEL_READER0:MultiLevelReader]-Component pre-execute initialization failed. Prefix mapping table must not be empty
at org.jetel.graph.Node.run(Node.java:418)
at java.lang.Thread.run(Thread.java:619)
Caused by: Prefix mapping table must not be empty
at com.opensys.cloveretl.data.parser.PrefixMultiLevelSelector.a(Unknown Source)
at com.opensys.cloveretl.data.parser.PrefixMultiLevelSelector.init(Unknown Source)
at com.opensys.cloveretl.data.parser.b.init(Unknown Source)
at org.jetel.util.MultiFileReader.init(MultiFileReader.java:108)
at com.opensys.cloveretl.component.MultiLevelReader.preExecute(Unknown Source)
at org.jetel.graph.Node.run(Node.java:416)
… 1 more
INFO [WatchDog] - [Clover] Post-execute phase finalization: 0
____________________________________________________________________

I Have only one field in my input datafile containing one word (the most sample datafile).

Someone can help me ?

Thanks by advance.

2

Hello,
I suspect, that you didn’t specify selector code (class) nor selector properties and MultilevelDataReader requires one of them. But for reading not complex files (with one type of records), you should use UniversalDataReader, not the Multilevel one. Also, when creating the xml file from one input port only, it’s easier to do it with StructerDataWriter instead of XMLWriter.