Detect validation.xml files

This rule flags the existence of XML files named validation.xml within the project contents. With the addition of the Bean Validation API in Java EE 6, validation.xml became a reserved filename for use by the Bean Validation API.

Errors will be logged and server startup performance might be impacted if validation.xml files exist that are not for bean validation. Make sure that any such XML files are migrated to prevent performance issues on WebSphere Application Server. To migrate, you can rename the file and update the code that uses it.

For additional information see: Using bean validation in WebSphere Application Server