Xerces error: org.apache.xerces.impl.dv.dtd.DTDDVFactoryImpl

Question

I\'m developing a web application using JSF 2.0, NetBeans 6.9.1, GlassFish Server 3.1, mojarra 2.0.3, and JasperReports 3.7.6. Included in my project library is the jar file

Answer 1

If you provide your own xerces.jar, you have to do that through the Endorsed Standards Override Mechanism (java -Djava.endorsed.dirs=/path/to/xerces.jar), you are not allowed to just add it on the classpath (and will sooner or later run into trouble if you do). Let me explain.

JAXP is the Java API for XML Processing. The creation of JAXP objects (like parsers, XSLT transfomers, DOM Documents) is done through the factory/factory-method pattern so you can plugin a new JAXP implementation (it has to be newer than the one provided in your JRE). Xerces provides (part of) a JAXP implementation and contains endorsed standards (an endorsed standard is a Java API defined through a standards process other than the Java Community Process, see the Endorsed Standards Override Mechanism). You'll run in all kinds of troubles if you don't use the ESOM.

Answer 2

I got this error when using Selenium with Glassfish. I got around it by copying XML jars (xerces-*, xalan-*, xml-apis*, serialize*) from selenium/libs/ to $AS_HOME/lib/endorsed (for Glassfish 2) or to $AS_HOME/glassfish/lib/endorsed for Glassfish 4.