Alison,
based upon the XML schema fragment given below, I thin that Castor is
correct. In other words, if a <FilmReference> element is present in your
XML document instance, it will have to be non-empty. That's exactly what
your XML schema definition for <FilmReference> defines. Other than
changing your element definition, there's no way out. Remember that
empty tags imply that the element in question is present, and thus needs
to conform with the rules defined.
Werner
Rimmer, Alison wrote:
I have a field defined as non-mandatory, but also has some details of
the type of data it should contain if it exists:
[schema snippet]
<element name="FilmReference" minOccurs="0">
<simpleType>
<restriction base="string">
<minLength value="1"/>
<maxLength value="11"/>
<pattern value="[*0-9 A-Z]*"/>
</restriction>
</simpleType>
</element>
I used Castor 1.1.1 to generate the classes from the schema, which I
then use for unmarshalling (including descriptors).
If the XML I receive contains no 'FilmReference' tag it unmarshalls and
validates successfully, but if it contains an empty tag, it fails with
the following error:
The following exception occured while validating field:
_possibleMatchList of class:
com.btc.ba.fileinterface.possiblematches.PossibleMatches: The following
exception occured while validating field: _usage of class:
com.btc.ba.fileinterface.possiblematches.PossibleMatch: The following
exception occured while validating field: _filmReference of class:
com.btc.ba.fileinterface.possiblematches.Usage: Strings of this type
must have a minimum length of 1 characters{File: [not available]; line:
41998; column: 22}
at
org.exolab.castor.xml.Unmarshaller.convertSAXExceptionToMarshalException(Unmarshaller.java:775)
at
org.exolab.castor.xml.Unmarshaller.unmarshal(Unmarshaller.java:741)
at
org.exolab.castor.xml.Unmarshaller.unmarshal(Unmarshaller.java:621)
at
com.btc.ba.fileinterface.DataLoader.processPossibleMatches(DataLoader.java:223)
at
com.btc.ba.fileinterface.DataLoader.processFile(DataLoader.java:181)
at com.btc.ba.fileinterface.DataLoader.run(DataLoader.java:128)
at
com.btc.ba.fileinterface.ProcessController.doProcessing(ProcessController.java:127)
at
com.btc.ba.fileinterface.ProcessController.run(ProcessController.java:68)
Caused by: ValidationException: The following exception occured while
validating field: _possibleMatchList of class:
com.btc.ba.fileinterface.possiblematches.PossibleMatches: The following
exception occured while validating field: _usage of class:
com.btc.ba.fileinterface.possiblematches.PossibleMatch: The following
exception occured while validating field: _filmReference of class:
com.btc.ba.fileinterface.possiblematches.Usage: Strings of this type
must have a minimum length of 1 characters;
- location of error: XPATH: /PossibleMatches
The following exception occured while validating field: _usage of class:
com.btc.ba.fileinterface.possiblematches.PossibleMatch: The following
exception occured while validating field: _filmReference of class:
com.btc.ba.fileinterface.possiblematches.Usage: Strings of this type
must have a minimum length of 1 characters
at
org.exolab.castor.xml.FieldValidator.validate(FieldValidator.java:270)
at
org.exolab.castor.xml.util.XMLClassDescriptorImpl.validate(XMLClassDescriptorImpl.java:1048)
at org.exolab.castor.xml.Validator.validate(Validator.java:127)
at
org.exolab.castor.xml.UnmarshalHandler.endElement(UnmarshalHandler.java:921)
at
org.exolab.castor.xml.UnmarshalHandler.endElement(UnmarshalHandler.java:1119)
at
org.apache.xerces.parsers.AbstractSAXParser.endElement(Unknown Source)
at
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanEndElement(Unknown
Source)
at
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown
Source)
at
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown
Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown
Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown
Source)
at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown
Source)
at
org.exolab.castor.xml.Unmarshaller.unmarshal(Unmarshaller.java:729)
... 6 more
Caused by: ValidationException: The following exception occured while
validating field: _usage of class:
com.btc.ba.fileinterface.possiblematches.PossibleMatch: The following
exception occured while validating field: _filmReference of class:
com.btc.ba.fileinterface.possiblematches.Usage: Strings of this type
must have a minimum length of 1 characters;
- location of error: XPATH: /PossibleMatch
The following exception occured while validating field: _filmReference
of class: com.btc.ba.fileinterface.possiblematches.Usage: Strings of
this type must have a minimum length of 1 characters
at
org.exolab.castor.xml.FieldValidator.validate(FieldValidator.java:270)
at
org.exolab.castor.xml.util.XMLClassDescriptorImpl.validate(XMLClassDescriptorImpl.java:1048)
at org.exolab.castor.xml.Validator.validate(Validator.java:127)
at
org.exolab.castor.xml.FieldValidator.validate(FieldValidator.java:237)
... 19 more
Caused by: ValidationException: The following exception occured while
validating field: _filmReference of class:
com.btc.ba.fileinterface.possiblematches.Usage: Strings of this type
must have a minimum length of 1 characters;
- location of error: XPATH: /Usage
Strings of this type must have a minimum length of 1 characters
at
org.exolab.castor.xml.FieldValidator.validate(FieldValidator.java:270)
at
org.exolab.castor.xml.util.XMLClassDescriptorImpl.validate(XMLClassDescriptorImpl.java:1048)
at org.exolab.castor.xml.Validator.validate(Validator.java:127)
at
org.exolab.castor.xml.FieldValidator.validateInstance(FieldValidator.java:318)
at
org.exolab.castor.xml.FieldValidator.validate(FieldValidator.java:263)
... 22 more
Caused by: ValidationException: Strings of this type must have a minimum
length of 1 characters
at
org.exolab.castor.xml.validators.StringValidator.validate(StringValidator.java:292)
at
org.exolab.castor.xml.validators.StringValidator.validate(StringValidator.java:340)
at
org.exolab.castor.xml.FieldValidator.validateInstance(FieldValidator.java:316)
at
org.exolab.castor.xml.FieldValidator.validate(FieldValidator.java:263)
... 26 more
[truncated]
I would have expected empty tags for non-mandatory fields to be ignored,
but this does not seem to be the case. Is there anything I can do about
this (other than asking the customer not to send empty tags)?
regards,
Alison
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