Unable to use with JRuby 9.1

[t3hk0d3]

java.lang.VerifyError: class org.projectodd.wunderboss.rack.RackEnvironmentHash overrides final method to_s19.(Lorg/jruby/runtime/ThreadContext;)Lorg/jruby/runtime/builtin/IRubyObject;
        at java.lang.ClassLoader.defineClass1(Native Method) ~[na:1.8.0_66]
        at java.lang.ClassLoader.defineClass(ClassLoader.java:760) ~[na:1.8.0_66]
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) ~[na:1.8.0_66]
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:467) ~[na:1.8.0_66]
        at java.net.URLClassLoader.access$100(URLClassLoader.java:73) ~[na:1.8.0_66]
        at java.net.URLClassLoader$1.run(URLClassLoader.java:368) ~[na:1.8.0_66]
        at java.net.URLClassLoader$1.run(URLClassLoader.java:362) ~[na:1.8.0_66]
        at java.security.AccessController.doPrivileged(Native Method) ~[na:1.8.0_66]
        at java.net.URLClassLoader.findClass(URLClassLoader.java:361) ~[na:1.8.0_66]
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[na:1.8.0_66]
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[na:1.8.0_66]
        at org.projectodd.wunderboss.rack.RackEnvironment.getEnv(RackEnvironment.java:94) ~[wunderboss-rack.jar:na]
        at org.projectodd.wunderboss.rack.RackApplication.call(RackApplication.java:50) ~[wunderboss-rack.jar:na]
        at org.projectodd.wunderboss.rack.RackHandler.handleRequest(RackHandler.java:36) ~[wunderboss-rack.jar:na]
        at io.undertow.server.session.SessionAttachmentHandler.handleRequest(SessionAttachmentHandler.java:68) ~[undertow-core-1.1.0.Final.jar:1.1.0.Final]
        at io.undertow.server.Connectors.executeRootHandler(Connectors.java:197) ~[undertow-core-1.1.0.Final.jar:1.1.0.Final]
        at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:759) ~[undertow-core-1.1.0.Final.jar:1.1.0.Final]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[na:1.8.0_66]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) ~[na:1.8.0_66]
        at java.lang.Thread.run(Thread.java:745) ~[na:1.8.0_66]

[t3hk0d3]

Oops, issue in Torquebox code itself.

torquebox/torquebox#238