XSD Schema File Loading Errors

XSD Tutorials - Herong's Tutorial Examples

∟XSD Schema File Loading Errors

This section describes tutorial examples of different error cases when loading an XSD schema file with JAXP Schema and SchemaFactory classes.

If you try to use XsdSchemaLoader.java to load an XSD file that does no exist, you will some interesting error messages:

herong> javaXsdSchemaLoader wrong.xsd

Schema Language: http://www.w3.org/2001/XMLSchema
Factory Class: com.sun.org.apache.xerces.internal.jaxp
   .validation.XMLSchemaFactory

org.xml.sax.SAXParseException: schema_reference.4:
Failed to read schema document 'file:/herong/xsd/wrong.xsd', because
   1) could not find the document;
    2) the document could not be read;
    3) the root element of the document is not <xsd:schema>.

If you try to use XsdSchemaLoader.java to load a non-XML file as the XSD file, you will get an XML parsing error:

(JDK 13)
herong> javaXsdSchemaLoader XsdSchemaLoader.java
org.xml.sax.SAXParseException: Content is not allowed in prolog.
org.xml.sax.SAXParseException; systemId:
   file:/herong/xsd/XsdSchemaLoader.java;
   lineNumber: 1; columnNumber: 1; Content is not allowed in prolog.

(JDK 1.6)
herong> javaXsdSchemaLoader XsdSchemaLoader.java
org.xml.sax.SAXParseException: Content is not allowed in prolog.

If you try to use XsdSchemaLoader.java to load a regular XML file as the XSD file, you will get an XML Schema syntax error:

(JDK 13)
herong> java XsdSchemaLoader first_html.xml
org.xml.sax.SAXParseException; systemId: file:/herong/xsd/first_html.xml;
lineNumber: 3; columnNumber: 46; s4s-elt-character:
Non-whitespace characters are not allowed in schema elements other
than 'xs:appinfo' and 'xs:documentation'.
Saw 'My first HTML document in XML format.'.

(JDK 1.6)
herong> java XsdSchemaLoader first_html.xml
org.xml.sax.SAXParseException: s4s-elt-character:
Non-whitespace characters are not allowed in schema elements other
than 'xs:appinfo' and 'xs:documentation'.
Saw 'My first HTML document in XML format.'.