error when validation xml with xsd spring boot

Question

I want to validate the generated xml, with the xsd file. But I got the following error message.

org.springframework.web.util.NestedServletException: Handler dispatch failed; nested exception is java.lang.NoClassDefFoundError: com/ibm/icu/text/UTF16

Here's my code:

public void validateAgainstXSD(File xml) {
        try {
            SchemaFactory factory = SchemaFactory.newInstance("http://www.w3.org/XML/XMLSchema/v1.1");
            Schema schema = factory.newSchema(new File(xsdFilepath));
            Validator validator = schema.newValidator();
            validator.validate(new StreamSource(xml));
            System.out.println("success");
        } catch (Exception ex) {
            ex.getMessage();
        }
    }

And the error message is in the following line:

validator.validate(new StreamSource(xml));

Does anyone know why that happened? And what is the solution for successful validation? I really need your help, thank you.

Finally I found where the error lies. The error is in the following XSD:

<xs:simpleType name="nameNType">
    <xs:restriction base="xs:string">
        <xs:assertion test="string-length($value) &lt;= 65"/>
    </xs:restriction>
</xs:simpleType>

If I comment on the code snippet above, it has been successfully validated and no error message appears as above.

Another question, what is the format so that I can still use the xsd code snippet? How to change it to UTF-8?

check your all custom xsd are define while processing the xml file. link — Nishit Charania
– Nishit Charania, Commented Jun 15, 2022 at 5:31
looks that xml is having issue, is this possible to share your xsd and xml and stack trace ? — Nishit Charania
– Nishit Charania, Commented Jun 15, 2022 at 6:25
I have checked that the xml is valid. Have you ever had the same error as above? — Jessica Cathrine
– Jessica Cathrine, Commented Jun 15, 2022 at 6:58
From error that you have mention, I can see program not find custom type of "com/ibm/icu/text/UTF16". That is why I asked to validate your xml and asked to define xsd if needed. Hope this will help ! — Nishit Charania
– Nishit Charania, Commented Jun 15, 2022 at 7:14

MartinByers · Accepted Answer · 2022-06-15 07:21:31Z

1

Being unable to find the class com/ibm/icu/text/UTF16 indicates 2 things:

You don't have that class on your class-path.
The parser is trying to parse thinking that either the xsd or XML are using the UTF-16 character set.

So this leaves a few solutions

To fix 1 you could, find a jar with the character set class, and include it on your class-path. This may work but it would not be my first choice.

To fix 2 you will need to understand why it is trying to use uft-16. If this is not correct, you may be able to specify another set when reading your files. Additionally you may want to investigate where the class com/ibm/icu/text/UTF16 is being specified, and possibly specify a different character set class.

Typically I ensure that all files I load are in utf-8, specify utf-8 during read, and have it specified at a system level.

answered Jun 15, 2022 at 7:21

MartinByers

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4 Comments

Jessica Cathrine Over a year ago

Thank you very much for the answer. I'm still confused, how do we know the xml or xsd is using UTF-16? Whereas in my xml it is defined as UTF-8, here is an example for xml <?xml version="1.0" encoding="UTF-8" standalone="yes"?> and for xsd : <?xml version="1.0" encoding="UTF-8"?>

Jessica Cathrine Over a year ago

Finally I found the location of the error. I've updated in the question above. It will be very helpful if there is a solution from you. Thank you

MartinByers Over a year ago

Hi @JessicaCathrine I was surprised to hear that commenting out the lines mentioned solved your problem. Although it sounds like there is a specific 'utf-16' Character in the block, I would try removing the assertion and see if you can isolate it to a smaller block of text, then you can look at the number for each char, I suspect that there is a hidden char in there somewhere

MartinByers Over a year ago

Alternatively you could pump in into a text tool such as notepad ++, show hidden chars and force and encoding change.

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