Wave in a Box crash on ant command

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Release: Ubuntu 10.10

I was running commands exactly as stated on http://www.waveprotocol.org/code except changed the dir name to just "wave":
$ hg clone https://wave-protocol.googlecode.com/hg/ wave-protocol
$ cd wave-protocol
$ ant
$ cp server.config.example server.config
$ $EDITOR server.config
$ ./run-server.sh
Error occurred after "ant".
I expected it to compile without error.
See below and attached for error message.

compile-gwt:
     [java] Jan 17, 2011 3:20:59 PM java.util.prefs.FileSystemPreferences$2 run
     [java] INFO: Created user preferences directory.
     [java] Compiling module org.waveprotocol.box.webclient.WebClientProd
     [java] Compiling 9 permutations
     [java] Compiling permutation 0...
     [java] #
     [java] # A fatal error has been detected by the Java Runtime Environment:
     [java] #
     [java] # SIGSEGV (0xb) at pc=0xb5261597, pid=10507, tid=2340141936
     [java] #
     [java] # JRE version: 6.0_20-b20
     [java] # Java VM: OpenJDK Server VM (19.0-b09 mixed mode linux-x86 )
     [java] # Derivative: IcedTea6 1.9.2
     [java] # Distribution: Ubuntu 10.10, package 6b20-1.9.2-0ubuntu2
     [java] # Problematic frame:
     [java] # J com.google.gwt.dev.js.JsInliner$InliningVisitor.endVisit(Lcom/google/gwt/dev/js/ast/JsInvocation;Lcom/google/gwt/dev/js/ast/JsContext;)V
     [java] #
     [java] # An error report file with more information is saved as:
     [java] # /var/www/vhosts/sbox/Web/wave/hs_err_pid10507.log
     [java] #
     [java] # If you would like to submit a bug report, please include
     [java] # instructions how to reproduce the bug and visit:
     [java] # https://bugs.launchpad.net/ubuntu/+source/openjdk-6/
     [java] #

BUILD FAILED
/var/www/vhosts/sbox/Web/wave/build.xml:326: Java returned: 134

Total time: 4 minutes 22 seconds