dev-java/icedtea-7.2.3.6 failes to build with a creepy error message:

/tmp/portage/dev-java/icedtea-7.2.3.6/work/icedtea-2.3.6/openjdk.build-boot/bin/java -XX:-PrintVMOptions -XX:+UnlockDiagnosticVMOptions -XX:-LogVMOutput -Xmx512m -Xms512m -XX:PermSize=32m -XX:MaxPermSize=160m -cp /tmp/portage/dev-java/icedtea-7.2.3.6/work/icedtea-2.3.6/openjdk.build-boot/classes sun.rmi.rmic.Main -classpath "/tmp/portage/dev-java/icedtea-7.2.3.6/work/icedtea-2.3.6/openjdk.build-boot/classes" \
-d /tmp/portage/dev-java/icedtea-7.2.3.6/work/icedtea-2.3.6/openjdk.build-boot/classes \
-v1.2 \
-keepgenerated \
javax.management.remote.rmi.RMIConnectionImpl
Error occurred during initialization of VM
an: ôln.class
make[6]: *** [/tmp/portage/dev-java/icedtea-7.2.3.6/work/icedtea-2.3.6/openjdk.build-boot/classes/javax/management/remote/rmi/RMIConnectionImpl_Stub.class] Error 1

i've had this issue for a long time, last time icedtea build successfully:
Sat Oct 20 03:29:32 2012 >>> dev-java/icedtea-7.2.3.3
merge time: 1 hour, 6 minutes and 57 seconds.