SOA 12c DBAdapter : JDeveloper Error Element 'properties' used but not declared

If you are trying to open your DBAdapter configuration but getting the below error in popup:

java.util.InvalidPropertiesFormatException:
org.xml.sax.SAXParseException; lineNumber: 2; columnNumber: 12; <Line 2, Column 12>:
XML-20149: (Error) Element 'properties' used but not declared.
    at sun.util.xml.PlatformXmlPropertiesProvider.load(PlatformXmlPropertiesProvider.java:80)
    at java.util.Properties$XmlSupport.load(Properties.java:1201)

The configuration still opens if you ignore the error but properties don't load correctly.

The reason for this error is that the properties declaration is missing from the adapter-properties.xml file.

Add the below line before the properties element in your adapter-properties.xml file.

<!DOCTYPE properties SYSTEM "http://java.sun.com/dtd/properties.dtd">

Save and retry.

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Happy Learning!!