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# XML Parser Limitations

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Crimson (`http://xml.apache.org/crimson/`) is the XML parser supplied in the Java 2 Platform, Standard Edition (J2SE) and in some JAXP reference implementations.

If you use Crimson with the JAXP API to parse XML files whose system identifier is not a fully qualified URL, then XML parsing will fail with a not valid URL exception.

Other XML parsers defer validation of the system identifier URL until it is specifically referenced.

If you are experiencing this problem, consider one of the following alternatives:

- Ensure that your XML files use a fully qualified system identifier URL.

- Use another XML parser (such as the OracleAS XML Parser for Java v2).