Unable to build wsdl for 1.5

I'm getting the following error building a wsdl from Salesforce.com. I've checked and it's valid xml

[xxxxxxxxxx]$ java -DcompileTarget=1.5 -classpath WebContent/WEB-INF/lib/wsc-22-jdk-1-5.jar com.sforce.ws.tools.wsdlc enterprise.wsdl enterprise.jar
[WSC][wsdlc.<init>:69]Created temp dir: /tmp/wsdlc-temp-220369021090177547-dir
[WSC][wsdlc.generateTypes:266]Generating Java files from schema ...
[WSC][wsdlc.generateTypes:273]Generated 1220 java files.
[WSC][wsdlc$Compiler.compile:384]Compiling to target 1.5... 
Error: Failed to compile: java.lang.reflect.InvocationTargetException

This InvocationTargetException doesn't appear to be anywhere in the xml either.