Signal.java:126:in `sun.misc.Signal.<init>':
java.lang.IllegalArgumentException: Unknown signal: USR
1 (NativeException)
from NativeConstructorAccessorImpl.java:-2:in
`sun.reflect.NativeConstructorAccessorImpl.new
Instance0'
from NativeConstructorAccessorImpl.java:39:in
`sun.reflect.NativeConstructorAccessorImpl.new
Instance'
from DelegatingConstructorAccessorImpl.java:27:in
`sun.reflect.DelegatingConstructorAccessor
Impl.newInstance'
from Constructor.java:494:in
`java.lang.reflect.Constructor.newInstance'
from JavaConstructor.java:88:in
`org.jruby.javasupport.JavaConstructor.new_instance'
from null:-1:in
`org.jruby.javasupport.JavaConstructorInvokernew_instancexx1.call'
from FastInvocationCallback.java:49:in
`org.jruby.runtime.callback.FastInvocationCallback.ex
ecute'