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Data Encoding Error 'Invalid UTF-8 middle byte' After Reading File From FTP Directory With MuleSoft SOAP Connector
Data pubblicazione: Jan 9, 2026
Descrizione
You have a Flow that reads a file from an FTP directory. When you map it into another structure to be delivered using the MuleSoft SOAP connector, an error like below is thrown:
"\"org.mule.weave.v2.module.reader.ReaderParsingException: Invalid UTF-8 middle byte 0x20 (at char #317, byte #127)\nTrace:\n at main (Unknown), while reading `payload` as Xml.\nTrace:\n at main (Unknown)\n\" evaluating expression: \"%dw 2.0\noutput application/json skipNullOn = \"everywhere\"\nns ns0 [......] "."
Risoluzione
The cause of the MuleSoft Flow error "Invalid UTF-8 middle byte", is that the mapping cannot parse the input message due to some unexpected characters being received in the file being read from the FTP directory.
SOLUTION
In the File Read Flow, set the MIME Type to application/xml and Encoding parameter to ISO-8859-1 as shown in the screenshot example below:
Numero articolo Knowledge
001121702
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