This document introduces issues related to XML Parsing.
Abnormal Phenomenon:
An error is reported when selecting a node: com.fr.dp.exception.FineDPException: xml data stream error - specific cause - error location
Troubleshooting:
1. Verify whether the XML-formatted data is valid.
2. Check the completeness of XML tags and structures.
3. Verify whether special characters are escaped.
Error Report and Solutions:
XML Sample Data:
<person><name age="24">Zhang San</name></person><person><name age="27">Li Si</name></person><person><name age="30">Wang Wu</name></person>
Error:
com.fr.dp.exception.FineDPException: xml data stream error - Illegal to have multiple roots (start tag in epilog?). at [row,col {unknown-source}]: [6,6] - Illegal to have multiple roots (start tag in epilog?). at [row,col {unknown-source}]: [6,6]
<person><name age="24">Zhang San</person></name>
com.fr.dp.exception.FineDPException: xml data stream error - Unexpected close tag </person>; expected </name>. at [row,col {unknown-source}]: [17,33] - Unexpected close tag </person>; expected </name>. at [row,col {unknown-source}]: [17,33]
<text><name>1<2</name></text>
com.fr.dp.exception.FineDPException: xml data stream error - Unexpected character '2' (code 50) in content after '<' (malformed start element?). at [row,col {unknown-source}]: [31,17] - Unexpected character '2' (code 50) in content after '<' (malformed start element?). at [row,col {unknown-source}]: [31,17]
If there are many characters that need escaping, you can use the CDATA tag to make the XML parser ignore special characters and treat them as character data.
<![CDATA[Text content]]>
Alternatively, use the replace function to replace escape characters.
<person><name age=24>Zhang San</name></person>
com.fr.dp.exception.FineDPException: xml data stream error - Unexpected character '2' (code 50) in start tag Expected a quote at [row,col {unknown-source}]: [37,19] - Unexpected character '2' (code 50) in start tag Expected a quote at [row,col {unknown-source}]: [37,19]
<person><name>Zhang San</name></Person>
com.fr.dp.exception.FineDPException: xml data stream error - Unexpected close tag </Person>; expected </person>. at [row,col {unknown-source}]: [44,12] - Unexpected close tag </Person>; expected </person>. at [row,col {unknown-source}]: [44,12]
Nodes can be displayed normally when selected, but the preview is abnormal, either showing a blank page or throwing an error.
Namespace is incorrectly configured / XML nodes are not reselected after the namespace is modified
com.fr.dp.exception.FineDPException: Spark execution error - xml namespace error - specific namespace
Check whether the namespace exists and is correctly written.
Verify whether the XML path is correct.
com.fr.dp.exception.FineDPException: Spark execution error - xml namespace error - http://www.w3.org/2003/05/soap-envelope namespace uri is not exist in xml data - xml namespace error - http://www.w3.org/2003/05/soap-envelope namespace uri is not exist in xml data
The error is caused by the failure to update the XPath path.
Reselect the XML nodes to update the node path.
Issue Description
When parsing a specific field in XML, the field value can be parsed normally if the field is placed first in the parsing order; if it is not in the first position, the preview will be blank.
Solution
Upgrade to version 4.0.26 or later.
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