org.apache.xerces.jaxp.SAXParserFactoryImpl not found when importing Gears API in GWT

Check that Xerces exists in:

$JAVA_HOME/lib/endorsed

Sounds like a Java 5 issue. Also check the Java system property for:

javax.xml.parsers.SAXParserFactory

It should be:

org.apache.xerces.jaxp.SAXParserFactoryImpl

If not then that's your issue, make sure you set the system property.

Apparently this is a bug in jre 1.5. I was able to resolve the problem by switching my default JRE in Eclipse from 1.5.0_06 to 1.6.0_03, as shown below:

Thanks to Jon and Rahul for pointing me in the right direction.