Unable to generate Selenium tests because of Xerces error

[wraithmonster]

I am working on this tutorial, but getting stuck when trying to create Selenium tests.

~.web roo> selenium test --controller ~.web.PizzaOrderController
Created SRC_MAIN_WEBAPP/selenium
Created SRC_MAIN_WEBAPP/selenium/test-pizzaorder.xhtml
Created SRC_MAIN_WEBAPP/selenium/test-suite.xhtml
Undo create SRC_MAIN_WEBAPP/selenium/test-suite.xhtml
Undo create SRC_MAIN_WEBAPP/selenium/test-pizzaorder.xhtml
Undo create SRC_MAIN_WEBAPP/selenium
com.sun.org.apache.xerces.internal.dom.DeferredCommentImpl cannot be cast to org.w3c.dom.Element

A person at this forum suggested removing Xerces from the classpath because Java 6 has its own XML parser based on Xerces. However, I haven't come across a clear way to remove something from the classpath, only setting it (which I think would be tedious each time).

UPDATE

Here is the full trace with "development mode":

roo> development mode
Development mode set to true
roo> selenium test --controller ~.web.PizzaOrderController
Created SRC_MAIN_WEBAPP/selenium
Created SRC_MAIN_WEBAPP/selenium/test-pizzaorder.xhtml
Created SRC_MAIN_WEBAPP/selenium/test-suite.xhtml
Undo create SRC_MAIN_WEBAPP/selenium/test-suite.xhtml
Undo create SRC_MAIN_WEBAPP/selenium/test-pizzaorder.xhtml
Undo create SRC_MAIN_WEBAPP/selenium
com.sun.org.apache.xerces.internal.dom.DeferredCommentImpl cannot be cast to org.w3c.dom.Element
java.lang.ClassCastException: com.sun.org.apache.xerces.internal.dom.DeferredCommentImpl cannot be cast to org.w3c.dom.Element
    at org.springframework.roo.addon.web.menu.MenuOperationsImpl.addMenuItem(MenuOperationsImpl.java:88)
    at org.springframework.roo.addon.web.selenium.SeleniumOperationsImpl.manageTestSuite(SeleniumOperationsImpl.java:185)
    at org.springframework.roo.addon.web.selenium.SeleniumOperationsImpl.generateTest(SeleniumOperationsImpl.java:140)
    at org.springframework.roo.addon.web.selenium.SeleniumCommands.generateTest(SeleniumCommands.java:35)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.springframework.roo.support.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:191)
    at org.springframework.roo.process.manager.ProcessManagerHostedExecutionStrategy$1.callback(ProcessManagerHostedExecutionStrategy.java:34)
    at org.springframework.roo.process.manager.internal.DefaultProcessManager.doTransactionally(DefaultProcessManager.java:169)
    at org.springframework.roo.process.manager.internal.DefaultProcessManager.execute(DefaultProcessManager.java:132)
    at org.springframework.roo.process.manager.ProcessManagerHostedExecutionStrategy.execute(ProcessManagerHostedExecutionStrategy.java:32)
    at org.springframework.roo.shell.AbstractShell.executeCommand(AbstractShell.java:158)
    at org.springframework.roo.shell.jline.JLineShell.promptLoop(JLineShell.java:200)
    at org.springframework.roo.shell.jline.JLineShell.run(JLineShell.java:126)
    at java.lang.Thread.run(Thread.java:619)

Does anyone know of a clear way to remove jars from the classpath? Has anyone encountered this problem before and solved it another way?

This question is also posted at StackOverflow.