javax.xml.parsers.FactoryConfigurationError: Provider org.apache.xerces.jaxp.SAXParserFactoryImpl not found

Having fixed https://jira.jboss.org/browse/JBIDE-6371, 2 problems remain in trying to build JBT w/ basebuilder 3.6RC1 against Helios:

javax.xml.parsers.FactoryConfigurationError: Provider org.apache.xerces.jaxp.SAXParserFactoryImpl not found

org.xml.sax.SAXException: Could not acquire XML parsing service.

Snippet of log:

!SESSION 2010-06-08 12:44:23.632 -----------------------------------------------
eclipse.buildId=200905221710
java.version=1.6.0_18
java.vendor=Sun Microsystems Inc.
BootLoader constants: OS=linux, ARCH=x86_64, WS=gtk, NL=en_US
Framework arguments: -application org.eclipse.ant.core.antRunner -f /mnt/hudson_workspace/workspace/jbosstools-nightly-3.2.helios/org.jboss.ide.eclipse.releng/builders/product/productBuild.xml build.standalone.release
Command-line arguments: -application org.eclipse.ant.core.antRunner -data /mnt/hudson_workspace/workspace/jbosstools-nightly-3.2.helios/jbds-build/workspace -f /mnt/hudson_workspace/workspace/jbosstools-nightly-3.2.helios/org.jboss.ide.eclipse.releng/builders/product/productBuild.xml build.standalone.release

!ENTRY org.eclipse.osgi 4 0 2010-06-08 12:44:26.722
!MESSAGE An unexpected runtime error has occurred.
!STACK 0
javax.xml.parsers.FactoryConfigurationError: Provider org.apache.xerces.jaxp.SAXParserFactoryImpl not found
at javax.xml.parsers.SAXParserFactory.newInstance(SAXParserFactory.java:134)
at org.eclipse.core.runtime.internal.adaptor.EclipseAdaptorHook$ParsingService.createService(EclipseAdaptorHook.java:147)
at org.eclipse.core.runtime.internal.adaptor.EclipseAdaptorHook$ParsingService.getService(EclipseAdaptorHook.java:139)
at org.eclipse.osgi.internal.serviceregistry.ServiceUse$1.run(ServiceUse.java:120)
at java.security.AccessController.doPrivileged(Native Method)
at org.eclipse.osgi.internal.serviceregistry.ServiceUse.getService(ServiceUse.java:118)
at org.eclipse.osgi.internal.serviceregistry.ServiceRegistrationImpl.getService(ServiceRegistrationImpl.java:447)
at org.eclipse.osgi.internal.serviceregistry.ServiceRegistry.getService(ServiceRegistry.java:430)
at org.eclipse.osgi.framework.internal.core.BundleContextImpl.getService(BundleContextImpl.java:667)
at org.osgi.util.tracker.ServiceTracker.addingService(ServiceTracker.java:442)
at org.osgi.util.tracker.ServiceTracker$Tracked.customizerAdding(ServiceTracker.java:896)
at org.osgi.util.tracker.AbstractTracked.trackAdding(AbstractTracked.java:261)
at org.osgi.util.tracker.AbstractTracked.trackInitial(AbstractTracked.java:184)
at org.osgi.util.tracker.ServiceTracker.open(ServiceTracker.java:339)
at org.osgi.util.tracker.ServiceTracker.open(ServiceTracker.java:273)

Full log:

http://hudson.qa.jboss.com/hudson/job/jbosstools-nightly-3.2.helios/61/consoleText